introduction about acidic soil and area distribution ,classification of acidic soil and source of acidic soil formation , characteristic of acid soil ,what are the impact on soil properties . Reclamation of acid soil , conclusion about acidic soil
This document discusses various aspects of soil chemistry including chemical composition, ion exchange, soil pH, acid soil development, buffer capacity, and pH management. Specifically, it covers topics like cation exchange capacity, sources of soil acidity and alkalinity, the role of aluminum in acid soils, liming to adjust soil pH, and using sulfur to increase soil acidity. Maintaining optimal soil pH is important for nutrient availability and plant growth.
Soil organic carbon plays a key role in soil health and fertility. It is an important component of soil organic matter, comprising 5% of average soil composition. Soil organic matter improves soil structure, increases the soil's water holding capacity, and serves as a "nutrient fund" by regulating the release of nutrients for plant uptake. Maintaining or increasing soil organic carbon levels is important for sustaining agricultural productivity and mitigating climate change, as soils can sequester atmospheric carbon through conservation practices that promote the buildup of soil organic matter over time.
This document discusses various physical properties of soils including soil texture, structure, density, porosity, colour, and consistence. Soil texture refers to the relative proportion of sand, silt, and clay particles in a soil. Soil structure describes the arrangement of these primary particles. Other properties discussed include bulk density, pore space, factors influencing colour, and Atterberg limits which characterize a soil's plasticity.
The colloidal state refers to a two-phase system in which one material in a very finely divided state is dispersed through second phase.
Eg., Solid in liquid (Dispersion of clay in water) and Liquid in gas (Fog or clouds in atmosphere).
Substances containing carbon are organic matter.
Soil organic matter consists of decomposing plant and animal residues.
It also includes substances of organic origin either leaving or dead.
Biological properties of soil and biodiversityHafsa Ranjha
This document discusses the biological properties of soil and biodiversity. It begins by defining soil and describing the different types of soil horizons and profiles. It then covers various soil properties like texture, structure, consistency, drainage and pH. The importance of soil moisture, minerals and organic matter in soil composition is explained. Different types of soils like clay, sandy, silt and loamy soils are defined. The document emphasizes the significance of soil in supporting plant growth and various life forms.
introduction about acidic soil and area distribution ,classification of acidic soil and source of acidic soil formation , characteristic of acid soil ,what are the impact on soil properties . Reclamation of acid soil , conclusion about acidic soil
This document discusses various aspects of soil chemistry including chemical composition, ion exchange, soil pH, acid soil development, buffer capacity, and pH management. Specifically, it covers topics like cation exchange capacity, sources of soil acidity and alkalinity, the role of aluminum in acid soils, liming to adjust soil pH, and using sulfur to increase soil acidity. Maintaining optimal soil pH is important for nutrient availability and plant growth.
Soil organic carbon plays a key role in soil health and fertility. It is an important component of soil organic matter, comprising 5% of average soil composition. Soil organic matter improves soil structure, increases the soil's water holding capacity, and serves as a "nutrient fund" by regulating the release of nutrients for plant uptake. Maintaining or increasing soil organic carbon levels is important for sustaining agricultural productivity and mitigating climate change, as soils can sequester atmospheric carbon through conservation practices that promote the buildup of soil organic matter over time.
This document discusses various physical properties of soils including soil texture, structure, density, porosity, colour, and consistence. Soil texture refers to the relative proportion of sand, silt, and clay particles in a soil. Soil structure describes the arrangement of these primary particles. Other properties discussed include bulk density, pore space, factors influencing colour, and Atterberg limits which characterize a soil's plasticity.
The colloidal state refers to a two-phase system in which one material in a very finely divided state is dispersed through second phase.
Eg., Solid in liquid (Dispersion of clay in water) and Liquid in gas (Fog or clouds in atmosphere).
Substances containing carbon are organic matter.
Soil organic matter consists of decomposing plant and animal residues.
It also includes substances of organic origin either leaving or dead.
Biological properties of soil and biodiversityHafsa Ranjha
This document discusses the biological properties of soil and biodiversity. It begins by defining soil and describing the different types of soil horizons and profiles. It then covers various soil properties like texture, structure, consistency, drainage and pH. The importance of soil moisture, minerals and organic matter in soil composition is explained. Different types of soils like clay, sandy, silt and loamy soils are defined. The document emphasizes the significance of soil in supporting plant growth and various life forms.
This document summarizes the key impacts and management of waterlogged soils. It notes that waterlogging can lead to oxygen depletion, increased bulk density, lowered redox potential, and nutrient toxicity issues like iron and manganese. Crop yields are reduced due to waterlogging, with losses ranging from 40-77% depending on the crop. Management strategies include land leveling, controlled irrigation, use of tolerant crop varieties, raised bed planting, drainage systems, and establishing deep-rooted plants for bioremediation. Rice cultivation can help reclaim waterlogged soils due to its extensive root system and ability to dilute soil salinity.
This document discusses the transformation of nitrogen, phosphorus, potassium, and sulfur in soils. It describes the key processes involved in each transformation, including mineralization, nitrification, denitrification, immobilization, solubilization, and oxidation/reduction. It notes that microorganisms play a critical role in transforming organic forms of nutrients into plant-available inorganic forms through the secretion of enzymes and organic acids. Specific microbes involved in each transformation are also outlined, such as nitrifying bacteria, phosphate solubilizing bacteria and fungi, potassium solubilizing bacteria, and sulfur oxidizing bacteria.
Pedology is the study of soil formation, genesis, classification, and properties from a natural perspective. Edaphology focuses on how soil relates to plant growth, nutrition, and crop yields. Both fields examine the composition of soil, but pedology views soil as a natural body while edaphology emphasizes soil's relationship to agricultural production.
The document discusses the transformation of sulfur in soils, including the mineralization of organic sulfur by microorganisms into inorganic sulfate that is available for plant uptake, as well as the oxidation, reduction, adsorption, and mineralization processes involved in sulfur cycling in soils. Key factors that influence sulfur availability to plants like soil pH, organic matter, salt content, and presence of vegetation are also covered.
Sulphur-Source, forms, fertilizers, their behaviour in soils, factors affecti...Abhishika John
Sulphur is an essential secondary nutrient for plant growth. It is the 13th most abundant element in the earth's crust and is absorbed by plants primarily as sulfate ions. Several factors affect the availability of sulphur in soils, including soil texture, organic matter content, pH, and the presence of other ions and nutrients. Sulphur exists in soils in both inorganic and organic forms, and the mineralization of organic sulphur by microorganisms makes it available to plants. Fertilizer application may be needed to supplement sulphur in deficient soils.
Saline, sodic, and saline-sodic soils occur when rainfall is insufficient to leach salts below the root zone, leaving soils high in salts like sodium, calcium, magnesium, chloride, and sulfate. Saline soils have high salt levels that increase osmotic pressure and reduce water availability to plants. Sodic soils have high sodium levels that disperse soil particles, reducing infiltration and root growth. Saline-sodic soils contain both high salts and sodium but remain flocculated if salt levels stay elevated; management focuses on exchanging sodium for calcium followed by leaching salts. Proper irrigation water quality and sufficient leaching are needed to manage all salt-affected soils for agriculture.
The document discusses concepts of nutrient availability for plant uptake from soil. It defines soil fertility and explains sources of nutrients in soil solution. The principal ways nutrients move from soil to plant roots are mass flow, diffusion and root interception. Macronutrients include nitrogen, phosphorus, potassium, calcium, magnesium and sulfur. Micronutrients include boron, copper, iron, manganese, molybdenum and zinc. The document also discusses plant tissue analysis for identifying nutrient deficiencies.
This document discusses salt-affected soils, including their classification, distribution in India, and properties. It describes saline soils, saline-alkali soils, and alkali soils based on pH, electrical conductivity, and exchangeable sodium percentage. The major causes of salt-affected soils are arid climate, poor drainage, irrigation with saline water, and other factors. Reclamation methods include physical, biological, and chemical approaches like using gypsum. Proper management of these soils requires attention to irrigation, drainage, amendments, and crop choices.
For Post graduate study of Physical Chemistry of Soil. Hand written notes describing Ion Exchange, Donnan Membrane Equilibrium, Diffuse double layer, Surface properties, Cation exchange, Anion and ligand exchange, Q/I studies etc.taught at BCKV at PG level (2nd Semester)
Nutrient budgets are becoming accepted tools to describe nutrient flows within cropping system and to assist in the planning of the rotational cropping and mixed farming system
Depending on the farm management and the balance of inputs and outputs of nutrient N,P and K budgets have been shown to range from deficit to surplus in cropping system
Budgets are the outcome of simple nutrient accounting process which details all the inputs and outputs to a given defined system over fixed period of time
A soil surface nutrient budget accounts for all nutrients that enter the soil surface and leave the soil through crop uptake.
This document discusses soil chemistry in submerged soils. It explains that submergence leads to a lack of oxygen in the soil, causing a shift from aerobic to anaerobic organisms. Anaerobic respiration causes chemical compounds other than oxygen to be reduced in a predictable sequence from the least to most energetically favorable. This results in changes to the chemical forms of elements like nitrogen, iron, and sulfur in the soil. Submergence also typically causes soil pH to become more neutral. Nutrient availability is highest within this neutral pH range common for submerged soils.
The document discusses 15 key processes involved in soil formation:
1) Humification transforms raw organic matter into humus through decomposition.
2) Laterization concentrates iron and aluminum oxides in tropical soils.
3) Eluviation mobilizes and translocates constituents like clay from top to lower layers.
4) Illuviation deposits translocated materials in lower layers, forming distinct horizons.
This document discusses the impact of carbon sequestration on soil and crop productivity. It provides background on global carbon emissions and pools. Soil acts as both a source and sink of atmospheric carbon through processes like photosynthesis, respiration, and decomposition. Improving soil organic carbon through practices like conservation tillage, cover crops, nutrient management, and agroforestry can increase crop yields by improving soil quality properties. Maintaining or increasing soil organic carbon levels through appropriate land management practices helps mitigate climate change while enhancing soil health and agricultural productivity.
Soil acidity is measured by pH, with values below 7 indicating acidity. Acid soils form through processes like leaching of basic salts by rainfall, decomposition of organic matter releasing acids, and weathering of acidic parent materials. This increases active and exchangeable acidity from hydrogen and aluminum ions. Factors like acid-forming fertilizers, organic matter, vegetation, and topography also influence acid soil development over time. Key processes are laterization in tropical areas and podzolization in humid regions, mobilizing aluminum and iron. Buffering capacity resists pH changes and is highest around pH 4.5-6 depending on soil properties.
Climate change impacts on soil health and their mitigation and adaptation str...Rajendra meena
The increasing concentration of greenhouse gases (GHGs) is bringing about major changes to the global environment resulting in global warming, depletion of ozone concentration in the stratosphere, changes in atmospheric moisture and precipitation and enhanced atmospheric deposition. These changes impact several soil processes, which are influence soil health. Soil health refers to the capacity of soil to perform agronomic and environmental functions. A number of physical, chemical and biological characteristics have been proposed as indicators of soil health. Generally, biological processes in soil such as decomposition and storage of organic matter, C and N cycling, microbial and metabolic quotients are likely to be influenced greatly by climate change and have thus high relevance to assess climate change impacts (Allen et al., 2011). Soil organic matter (SOM) exerts a major influence on several soil health indicators and is thus considered a key indicator of soil health. An optimal level of SOM is essential for maintaining soil health and alleviating rising atmospheric CO2 concentration. Elevated CO2 has increased C decay rates generally but in some cases elevated CO2 increases soil C storage (Jastrow et al., 2016). Enhancing the soil organic carbon pool also improves agro-ecosystem resilience, eco-efficiency, and adaptation to climate change. Healthy soils provide the largest store of terrestrial carbon, when managed sustainably; soils can play an important role in climate change mitigation by storing carbon (carbon sequestration) and decreasing greenhouse gas emissions in the atmosphere (Paustian et al., 2016).
Wright et al., (2005) reported that no tillage increase soil organic carbon (SOC) and nitrogen (SON) 11 and 21% in corn and 22 and 12 % in cotton than conventional tillage. Agroforestry system at farmers’ field enhance soil biological activity and amongst trees, P. cineraria based system brought maximum and significant improvement in soil biological activity (Yadav et al ., 2011).
Regenerative Agriculture as a Farming SolutionNelCoetzee
By: Jay Fuhrer. Rebuilding and maintaining life in the soil is directly linked to the longevity and reliability of our future agriculture; recognizing plants, animals, and soils evolved together over geological time
This document discusses soil acidity and pH. It begins by explaining how various natural and anthropogenic factors can contribute to soil acidity in humid regions. It then discusses how pH impacts nutrient availability and toxicity, with most nutrients being optimally available between pH 5.5-7. It also covers aluminum toxicity, how it is more prevalent at lower pH, and how different crop varieties have varying sensitivities. The document provides an overview of the multiple forms of soil acidity and explains pH in terms of hydrogen ion concentration.
Effects of Soil Organic Matter in the Soil, Benefits of soil organic matter, Amount of Soil organic matter, Maintenance or improvement of SOM, Factors affecting formation and decomposition of SOM
potassium fixation in different clay mineralsBharathM64
This document discusses potassium fixation in different clay minerals. It explains that potassium fixation was first reported in 1887 and involves potassium penetrating between clay layers and becoming tightly held. The degree of potassium fixation varies between clay types, with vermiculite showing the highest fixation due to its high charge density and large interlayer space, followed by illite, montmorillonite, and kaolinite. Factors like charge density, interlayer space size, solution concentration, and presence of other cations can influence how much potassium is fixed within clay minerals. The practical implication is that fixed potassium contributes to long-term potassium availability in soils.
The document discusses soil organic matter (SOM) dynamics in agricultural systems. It provides examples showing that only a small portion (around 10-17%) of crop residues and roots are retained as SOM in the long term. Factors like soil texture, historical vegetation, climate, landscape position, and management practices influence SOM levels by affecting the balance between organic matter inputs and losses through decomposition. Fine-textured soils in low-lying areas generally have higher SOM compared to coarse-textured or well-drained soils. Protecting organic materials from decomposition by physical protection within soil aggregates or association with mineral particles increases long-term retention as SOM.
This document summarizes the key impacts and management of waterlogged soils. It notes that waterlogging can lead to oxygen depletion, increased bulk density, lowered redox potential, and nutrient toxicity issues like iron and manganese. Crop yields are reduced due to waterlogging, with losses ranging from 40-77% depending on the crop. Management strategies include land leveling, controlled irrigation, use of tolerant crop varieties, raised bed planting, drainage systems, and establishing deep-rooted plants for bioremediation. Rice cultivation can help reclaim waterlogged soils due to its extensive root system and ability to dilute soil salinity.
This document discusses the transformation of nitrogen, phosphorus, potassium, and sulfur in soils. It describes the key processes involved in each transformation, including mineralization, nitrification, denitrification, immobilization, solubilization, and oxidation/reduction. It notes that microorganisms play a critical role in transforming organic forms of nutrients into plant-available inorganic forms through the secretion of enzymes and organic acids. Specific microbes involved in each transformation are also outlined, such as nitrifying bacteria, phosphate solubilizing bacteria and fungi, potassium solubilizing bacteria, and sulfur oxidizing bacteria.
Pedology is the study of soil formation, genesis, classification, and properties from a natural perspective. Edaphology focuses on how soil relates to plant growth, nutrition, and crop yields. Both fields examine the composition of soil, but pedology views soil as a natural body while edaphology emphasizes soil's relationship to agricultural production.
The document discusses the transformation of sulfur in soils, including the mineralization of organic sulfur by microorganisms into inorganic sulfate that is available for plant uptake, as well as the oxidation, reduction, adsorption, and mineralization processes involved in sulfur cycling in soils. Key factors that influence sulfur availability to plants like soil pH, organic matter, salt content, and presence of vegetation are also covered.
Sulphur-Source, forms, fertilizers, their behaviour in soils, factors affecti...Abhishika John
Sulphur is an essential secondary nutrient for plant growth. It is the 13th most abundant element in the earth's crust and is absorbed by plants primarily as sulfate ions. Several factors affect the availability of sulphur in soils, including soil texture, organic matter content, pH, and the presence of other ions and nutrients. Sulphur exists in soils in both inorganic and organic forms, and the mineralization of organic sulphur by microorganisms makes it available to plants. Fertilizer application may be needed to supplement sulphur in deficient soils.
Saline, sodic, and saline-sodic soils occur when rainfall is insufficient to leach salts below the root zone, leaving soils high in salts like sodium, calcium, magnesium, chloride, and sulfate. Saline soils have high salt levels that increase osmotic pressure and reduce water availability to plants. Sodic soils have high sodium levels that disperse soil particles, reducing infiltration and root growth. Saline-sodic soils contain both high salts and sodium but remain flocculated if salt levels stay elevated; management focuses on exchanging sodium for calcium followed by leaching salts. Proper irrigation water quality and sufficient leaching are needed to manage all salt-affected soils for agriculture.
The document discusses concepts of nutrient availability for plant uptake from soil. It defines soil fertility and explains sources of nutrients in soil solution. The principal ways nutrients move from soil to plant roots are mass flow, diffusion and root interception. Macronutrients include nitrogen, phosphorus, potassium, calcium, magnesium and sulfur. Micronutrients include boron, copper, iron, manganese, molybdenum and zinc. The document also discusses plant tissue analysis for identifying nutrient deficiencies.
This document discusses salt-affected soils, including their classification, distribution in India, and properties. It describes saline soils, saline-alkali soils, and alkali soils based on pH, electrical conductivity, and exchangeable sodium percentage. The major causes of salt-affected soils are arid climate, poor drainage, irrigation with saline water, and other factors. Reclamation methods include physical, biological, and chemical approaches like using gypsum. Proper management of these soils requires attention to irrigation, drainage, amendments, and crop choices.
For Post graduate study of Physical Chemistry of Soil. Hand written notes describing Ion Exchange, Donnan Membrane Equilibrium, Diffuse double layer, Surface properties, Cation exchange, Anion and ligand exchange, Q/I studies etc.taught at BCKV at PG level (2nd Semester)
Nutrient budgets are becoming accepted tools to describe nutrient flows within cropping system and to assist in the planning of the rotational cropping and mixed farming system
Depending on the farm management and the balance of inputs and outputs of nutrient N,P and K budgets have been shown to range from deficit to surplus in cropping system
Budgets are the outcome of simple nutrient accounting process which details all the inputs and outputs to a given defined system over fixed period of time
A soil surface nutrient budget accounts for all nutrients that enter the soil surface and leave the soil through crop uptake.
This document discusses soil chemistry in submerged soils. It explains that submergence leads to a lack of oxygen in the soil, causing a shift from aerobic to anaerobic organisms. Anaerobic respiration causes chemical compounds other than oxygen to be reduced in a predictable sequence from the least to most energetically favorable. This results in changes to the chemical forms of elements like nitrogen, iron, and sulfur in the soil. Submergence also typically causes soil pH to become more neutral. Nutrient availability is highest within this neutral pH range common for submerged soils.
The document discusses 15 key processes involved in soil formation:
1) Humification transforms raw organic matter into humus through decomposition.
2) Laterization concentrates iron and aluminum oxides in tropical soils.
3) Eluviation mobilizes and translocates constituents like clay from top to lower layers.
4) Illuviation deposits translocated materials in lower layers, forming distinct horizons.
This document discusses the impact of carbon sequestration on soil and crop productivity. It provides background on global carbon emissions and pools. Soil acts as both a source and sink of atmospheric carbon through processes like photosynthesis, respiration, and decomposition. Improving soil organic carbon through practices like conservation tillage, cover crops, nutrient management, and agroforestry can increase crop yields by improving soil quality properties. Maintaining or increasing soil organic carbon levels through appropriate land management practices helps mitigate climate change while enhancing soil health and agricultural productivity.
Soil acidity is measured by pH, with values below 7 indicating acidity. Acid soils form through processes like leaching of basic salts by rainfall, decomposition of organic matter releasing acids, and weathering of acidic parent materials. This increases active and exchangeable acidity from hydrogen and aluminum ions. Factors like acid-forming fertilizers, organic matter, vegetation, and topography also influence acid soil development over time. Key processes are laterization in tropical areas and podzolization in humid regions, mobilizing aluminum and iron. Buffering capacity resists pH changes and is highest around pH 4.5-6 depending on soil properties.
Climate change impacts on soil health and their mitigation and adaptation str...Rajendra meena
The increasing concentration of greenhouse gases (GHGs) is bringing about major changes to the global environment resulting in global warming, depletion of ozone concentration in the stratosphere, changes in atmospheric moisture and precipitation and enhanced atmospheric deposition. These changes impact several soil processes, which are influence soil health. Soil health refers to the capacity of soil to perform agronomic and environmental functions. A number of physical, chemical and biological characteristics have been proposed as indicators of soil health. Generally, biological processes in soil such as decomposition and storage of organic matter, C and N cycling, microbial and metabolic quotients are likely to be influenced greatly by climate change and have thus high relevance to assess climate change impacts (Allen et al., 2011). Soil organic matter (SOM) exerts a major influence on several soil health indicators and is thus considered a key indicator of soil health. An optimal level of SOM is essential for maintaining soil health and alleviating rising atmospheric CO2 concentration. Elevated CO2 has increased C decay rates generally but in some cases elevated CO2 increases soil C storage (Jastrow et al., 2016). Enhancing the soil organic carbon pool also improves agro-ecosystem resilience, eco-efficiency, and adaptation to climate change. Healthy soils provide the largest store of terrestrial carbon, when managed sustainably; soils can play an important role in climate change mitigation by storing carbon (carbon sequestration) and decreasing greenhouse gas emissions in the atmosphere (Paustian et al., 2016).
Wright et al., (2005) reported that no tillage increase soil organic carbon (SOC) and nitrogen (SON) 11 and 21% in corn and 22 and 12 % in cotton than conventional tillage. Agroforestry system at farmers’ field enhance soil biological activity and amongst trees, P. cineraria based system brought maximum and significant improvement in soil biological activity (Yadav et al ., 2011).
Regenerative Agriculture as a Farming SolutionNelCoetzee
By: Jay Fuhrer. Rebuilding and maintaining life in the soil is directly linked to the longevity and reliability of our future agriculture; recognizing plants, animals, and soils evolved together over geological time
This document discusses soil acidity and pH. It begins by explaining how various natural and anthropogenic factors can contribute to soil acidity in humid regions. It then discusses how pH impacts nutrient availability and toxicity, with most nutrients being optimally available between pH 5.5-7. It also covers aluminum toxicity, how it is more prevalent at lower pH, and how different crop varieties have varying sensitivities. The document provides an overview of the multiple forms of soil acidity and explains pH in terms of hydrogen ion concentration.
Effects of Soil Organic Matter in the Soil, Benefits of soil organic matter, Amount of Soil organic matter, Maintenance or improvement of SOM, Factors affecting formation and decomposition of SOM
potassium fixation in different clay mineralsBharathM64
This document discusses potassium fixation in different clay minerals. It explains that potassium fixation was first reported in 1887 and involves potassium penetrating between clay layers and becoming tightly held. The degree of potassium fixation varies between clay types, with vermiculite showing the highest fixation due to its high charge density and large interlayer space, followed by illite, montmorillonite, and kaolinite. Factors like charge density, interlayer space size, solution concentration, and presence of other cations can influence how much potassium is fixed within clay minerals. The practical implication is that fixed potassium contributes to long-term potassium availability in soils.
The document discusses soil organic matter (SOM) dynamics in agricultural systems. It provides examples showing that only a small portion (around 10-17%) of crop residues and roots are retained as SOM in the long term. Factors like soil texture, historical vegetation, climate, landscape position, and management practices influence SOM levels by affecting the balance between organic matter inputs and losses through decomposition. Fine-textured soils in low-lying areas generally have higher SOM compared to coarse-textured or well-drained soils. Protecting organic materials from decomposition by physical protection within soil aggregates or association with mineral particles increases long-term retention as SOM.
Long-term effect of nutrient management on soil fertility and soil organic ca...Pravash Chandra Moharana
This document summarizes a study on the long-term effects of nutrient management on soil fertility and soil organic carbon pools under a 6-year pearl millet-wheat cropping system. The study found that application of farmyard manure alone or integrated with chemical fertilizers led to significant increases in soil fertility parameters like nitrogen, phosphorus, potassium, and sulfur compared to the unfertilized control. It also increased total organic carbon, labile organic carbon, and microbial biomass carbon pools, especially in surface soils. Integrated nutrient management maintaining application of farmyard manure was most effective for enhancing crop productivity, nutrient availability, and soil carbon over the long term according to the carbon management index.
Soil organic matter A presentation by Mr.Allah Dad KhanMr.Allah Dad Khan
- Soil organic matter (SOM) encompasses all organic components in soil, including living organisms, fresh residues, and well-decomposed residues known as humus. SOM content in agricultural soils is typically 1-6% and provides numerous benefits to soil health.
- Fresh residues and decomposing organic matter are broken down by soil organisms, transforming plants materials into stable humus. Humus acts like a sponge, holding water and nutrients, and helps maintain good soil structure.
- Maintaining adequate levels of SOM through practices like proper fertilization, crop rotations, and returning crop residues can improve soil quality by
Soil Fertility Management and eco-efficiency of small holder agricultural sys...CIAT
This document summarizes a presentation by Deborah Bossio on soil fertility management and eco-efficiency in smallholder agricultural systems. It discusses the global context of soils and land research, including issues of food security, water scarcity, planetary boundaries, and ecosystem services. It outlines Bossio's background working on soil fertility projects in various countries. It also discusses IWMI's work on productive water use and creating impact through strategic research partnerships.
This document discusses potential methods for mitigating wind erosion in arid regions like the Sonoran Desert by building soil aggregates. It notes that barren lands are expanding and cause issues. Currently used stabilization methods only provide temporary fixes or don't improve soil health. The document proposes that adding organic matter and managing the soil microbiome could help "jump start" stabilizing these soils. It presents research on how microbes and fungi can build stable soil aggregates, and how adding amendments like compost, mulch or biochar could provide nutrients to boost microbes and plant growth. Directly inoculating soils with probiotic products or biocrust communities is also discussed as a way to augment the soil microbiome. The goal is to develop
ROLE OF SOIL ORGANIC MANURE IN SUSTAINING SOIL HEALTHRamyajit Mondal
This document discusses the role of soil organic manure in sustaining soil health. It defines soil health as the capacity of soil to function sustainably within an ecosystem. The use of chemical fertilizers is increasing crop production but degrading soil health over time. Organic manures from natural sources are a sustainable alternative that improve soil properties like structure, moisture retention, and nutrient levels. Factors like climate, vegetation, soil type and organisms influence organic matter levels in soil. Different types of organic manures are classified including farm yard manure, compost, green manuring, and vermicompost.
This document is a research paper that compares spent mushroom compost (SMC) to peat as a growing media. The paper hypothesizes that (1) plants grown in aged SMC will perform similarly or better than peat and (2) plants in fresh SMC will perform worse than peat or aged SMC. An experiment was conducted growing onion, lettuce, and fennel in peat, aged SMC, fresh SMC, and mixtures using plastic trays and soil blocks. The plants were grown for 5-6 weeks then weighed to analyze dry matter accumulation. The results supported the hypothesis that fresh SMC performed worse than the other media.
The document discusses the benefits of growing cover crops for building soil health. Some key benefits mentioned include improved soil structure and organic matter content, reduced erosion, increased moisture retention and nutrient cycling. Cover crops can improve soil biology by adding carbon and root biomass. Their root systems and residues help with compaction reduction and weed and pest suppression. Proper cover crop selection and management is important to maximize these soil health benefits. The document provides information on choosing cover crops that fit within crop rotations and managing them effectively.
Soil Health definition and relationship to soil biology
Characteristics of healthy soil
Assessment of soil health
Framework for evaluating soil health
Indicators
Types of indicators
Biological indicators
Role of biological indicators
This document provides information on basic soil improvement techniques for sustainable farmers. It discusses useful resources like the SARE publications website and books on cover crops and soil biology. The document then covers topics like the soil texture triangle, understanding a soil's physical properties, using web soil survey, improving soil structure, the role of organic matter, landscape effects on organic matter, and interpreting soil test results. It emphasizes understanding the living components of soil like bacteria, fungi, and soil food webs.
This document summarizes a proposed soil case study examining the use of biochar, gypsum, and fly ash amendments to improve nutrient retention, water holding capacity, and pest control in sandy southeastern soils used for cotton production. Specifically, the study will apply these amendments with and without poultry litter fertilizer, and measure soil nutrients, compaction, and pest populations over two growing seasons. The goal is to evaluate these amendments as alternatives or supplements to poultry litter to reduce nutrient runoff pollution while improving soil quality and farm profitability.
Enhancing SOC sequestration: myth or reality in Africa?CIAT
This document discusses the potential for enhancing soil organic carbon (SOC) sequestration in Africa. It notes that large losses of SOC have occurred globally due to agricultural practices, leaving potential for recovery of 21-51 Gt of carbon in soils. However, the document questions how much is realistically recoverable through improved land management practices. It examines studies showing mixed results of conservation agriculture and integrated soil fertility management in maintaining or increasing SOC over time in African contexts. The document emphasizes that priorities in Africa are food security and soil fertility, and any carbon sequestration benefits would be secondary. It calls for a holistic, sustainability-focused shift in global agriculture to tackle this challenge.
Effects of integrated water and nutrient management technologies on crop and ...Joanna Hicks
1. The study evaluated the effects of different soil and water conservation techniques combined with organic and inorganic fertility management on soil moisture storage, plant growth, and crop yields for smallholder farmers in Zimbabwe.
2. Post-planting tied ridging significantly increased soil moisture storage compared to conventional tillage. Conservation farming basins and rip-and-pot holing performed similarly in storing soil moisture.
3. Combining post-planting tied ridging with organic and inorganic fertilizers led to higher maize and soybean yields compared to other treatments in both the 2009-2010 and 2010-2011 growing seasons.
effect of organic matter in sustainable land use .docxadnanhossain53
Organic matter plays a critical role in soil sustainability by improving soil physical, chemical, and biological properties. It provides nutrients for plants, improves water retention, enhances soil structure, and promotes microbial activity. Sustainable land management aims to use land resources in a way that meets human needs while maintaining the land's long-term productivity through practices like conservation tillage, crop rotation, and use of organic manures to increase soil organic matter over time. Organic matter benefits soil in many ways, including improving structure, drainage, moisture retention, nutrient availability, and biological activity through its role in supporting microorganisms.
THE FARMING SYSTEMS TRIAL RODALE INSTITUTEAyda.N Mazlan
This document summarizes the key findings from the 30-year Farming Systems Trial conducted by Rodale Institute that compared organic and conventional farming systems. The three main points are:
1) Organic farming systems built soil organic matter and were better able to store and use water efficiently, while conventional systems depleted soil over time.
2) Organic corn and soybean yields matched conventional yields on average over 30 years and outperformed conventional yields in drought years.
3) Organic systems were more profitable than conventional systems due to lower energy inputs and producing similar or higher yields.
The Farming Systems Trial (FST)® at Rodale Institute is America’s longest running, side-by-side comparison of organic and chemical agriculture. Started in 1981 to study what happens during the transition from chemical to organic agriculture, the FST surprised a food community that still scoffed at organic practices. After an initial decline in yields during the first few years of transition, the organic system soon rebounded to match or surpass the conventional system. Over time, FST became a comparison between the long term potential of the two systems.
As we face uncertain and extreme weather patterns, growing scarcity and expense of oil, lack of water, and a growing population, we will require farming systems that can adapt, withstand or even mitigate these problems while producing healthy, nourishing food. After more than 30 years of side-by-side research in our Farming Systems Trial (FST), Rodale Institute has demonstrated that organic farming is better equipped to feed us now and well into the ever changing future.
Steve Groff has been a pioneer in no-till and cover cropping for over 30 years. He began no-tilling in 1982 and planting green in 1984. Through improved soil management practices like interseeding cover crops and planting green, Groff has increased the organic matter of his soils from 2.0% to 5.5% over 30 years. He advocates treating cover crops like cash crops by selecting diverse species mixtures and terminating them at the right time to maximize soil health and nutrient cycling benefits. Groff's experience demonstrates how cover cropping can improve soils and farm profitability over the long term.
The Ontario Bean Growers board is here for you! Come learn about OBG llllllactivities and project investments and hear from a dry bean farmer about tips on a successful harvest.Jennifer Mitchell, Ontario Bean Growers; Brendan Louwagie, dry bean grower and Thompsons Limited agronomist, Meghan Moran, OMAFRA Canola & Edible Bean Specialist
Review of the latest research on corn nitrogen fertilizer. Specifically covering the long-term impact of nitrogen fertilizer rates on soil health and new technologies to better predict nitrogen fertilizer requirements in corn. Joshua Nasielski, University of Guelph
The document discusses crop production and markets for corn, soybeans, wheat, and canola in the United States, Canada, and globally. Some key points:
- US corn production in 2020 is estimated to be the largest since 2016 at 94.1 million acres planted.
- Corn futures prices are expected to trade based on expectations of a large US crop until something changes that outlook.
- Nearly 50% of the global soybean supply is consumed in China, but US soybeans currently face a 25% tariff, reducing Chinese imports.
- Only about 12% of North American wheat is soft red wheat, the type often traded, so wheat news does not always strongly impact cash bids.
- In Ontario
This document discusses various topics related to soil compaction from agricultural equipment, including:
- Definitions of soil compaction and the factors that influence it
- Methods for reducing compaction, such as improving soil quality, avoiding wet soils, using larger tires with lower pressure
- How compaction affects soils and crop growth over time
- Measurements of load distribution in soils from different tires and inflation pressures
- Interpreting information provided on tire sidewalls
The document discusses the principles and benefits of precision agriculture. It describes defining soil zones using layers of data on yield, weather, and management. Inputs like soil testing and fertility are tailored to each zone. Variable-rate technology allows applying inputs like seed or fertilizer based on zone needs. Precision agronomy is evaluated by measuring success factors like yield and economics over multiple years, finding improved and more consistent results compared to average agronomy.
Advanced cover cropping strategies for specific goals and how to evaluate them. Grower Panel: Dan Petker, Petker Farms and Rick Kootstra, Kootstra Farms
Advanced cover cropping strategies for specific goals and how to evaluate them. Grower Panel: Dan Petker, Petker Farms and Rick Kootstra, Kootstra Farms
Stuart Adams operates a 2500 acre farm in Quebec and is looking to implement controlled traffic farming (CTF) to improve soil health and farming efficiency. He has experienced issues with soil compaction and seen yield benefits from reduced compaction. CTF will create permanent traffic lanes to minimize compaction between rows. Implementation will be gradual due to equipment and capital costs as well as challenging field conditions and the need for ongoing drainage work. While technology can help with CTF, seasonal challenges have limited investment and progress will take time given the size of the operation.
From compaction to tile spacing, learn the many factors
that determine the best drainage system for profit and environmental benefit. Peter Johnson, RealAgriculture & Jesse Tait, Tait Farm Drainage
The document provides an overview and outlook of commodity markets in 2020, with a focus on US and Canadian/Ontario market situations and projections. It summarizes key data on crop and livestock production, exports, prices, and supply/demand balances for major commodities like corn, soybeans, beef, and pork in the US and Ontario from 2007-2019. Projections show stable-to-increasing production and exports for most commodities in North America through 2021.
1) The 2019 growing season in Ontario was one of the wettest on record, resulting in hundreds of thousands of acres left unseeded or reseeded for soybeans.
2) County-level soybean yield statistics for 2019 show yields ranging from 25 to 56 bushels per acre depending on the county, with an overall Ontario yield of 45 bushels per acre.
3) Research studies showed that while planting soybeans in early June rather than mid-May resulted in some yield loss, adapting maturity dates and varieties can help mitigate these delays. Foliar fertilizers and inoculants did not increase yields.
Basic to advanced approaches to reducing traffic compaction in the field. Grower Panel: Warren Schneckenburger, Cedar Lodge Farms; Stuart Adams, Continuum Textiles & Tony Balkwill, Nithfield Advanced Agronomy
The behind the scenes of today’s satellite imagery technology and what it can do for your farm. Leander Campbell, AAFC Ottawa, Chris Olbach, Corteva Agriscience and Alex Whitley, Taranis
Heritage Conservation.Strategies and Options for Preserving India HeritageJIT KUMAR GUPTA
Presentation looks at the role , relevance and importance of built and natural heritage, issues faced by heritage in the Indian context and options which can be leveraged to preserve and conserve the heritage.It also lists the challenges faced by the heritage due to rapid urbanisation, land speculation and commercialisation in the urban areas. In addition, ppt lays down the roadmap for the preservation, conservation and making value addition to the available heritage by making it integral part of the planning , designing and management of the human settlements.
8. Historical US Corn Grain Yields
Do you think
historical SOM
levels look
anything like
this?
9. Bouma et al. (2016) documented large differences in soil C and function for Dutch fields
mapped as the same soil type but w/ long-term differences in management.
Soil genotype vs. phenotype???
crops crops grassland
1.7% OM 3.3% OM 5.0% OM
10. Soil Changes After Sixty Years of Land Use in Iowa
Jessica Veenstra, Iowa State University, 1126 Agronomy Hall, Iowa State
University, Ames, IA 50010
Soils form slowly, thus on human time scales, soil is essentially a non-renewable
resource. Therefore in order to maintain and manage our limited soil resources
sustainably, we must try to document, monitor and understand human induced
changes in soil properties. By comparing current soil properties to an archived
database of soil properties, this study assesses some of the changes that have
occurred over the last 60 years, and attempts to link those changes to natural and
human induced processes. This study was conducted across Iowa where the
primary land use has been row crop agriculture and pasture. We looked at
changes in A horizon depth, color, texture, structure, organic C content and pH.
Hill top and backslope landscape positions
have been eroded & now have thinner topsoil w/ less SOM
Catchment areas now have deeper topsoil w/ more SOM
11. Veenstra and Burras resampled 82 soil profiles on IA
farms with historical descriptions and classified the
soils according to the US, Canadian and FAO-WRB
taxonomic systems. 11 to 33% of the pedons originally
classified as Black soils (e.g., Prairie soils)
no longer classified as Black soils.
12. The current amount of OM in a soil
= the long-term balance between organic
matter inputs and outputs
grown in place,
redistributed on-farm,
imported from off-farm
harvested,
decomposed,
lost to erosion
So why hasn’t modern agriculture had a
more favorable impact on SOM?
13. grain, stover and roots each comprise
~1/3rd of the total biomass
A 200 bu/a
corn crop
adds
~10 t/a
of roots and
stover,
equivalent
to ~ 1 %
of the
weight of an
acre-plow
layer
So what
happens
to this
biomass?
High yielding grain crops return lots of residues
15. Phil Brookes
Practices that enhance crop yield
also impact a soil’s metabolism
When there is
more grass,
I eat more!!
16. Have you read this classic commentary?
Journal of Soil and Water Conservation - 1995
What are the symptoms of
the HIGH CARB DIET
that most US soils
receive?
17. There has been a surge in SOM research
since DeLuca’s commentary –
what have we learned???
The next slides review
some of the most
interesting recent
developments in
SOM research
18. Biologically
active SOM
We have known that SOM is a complex mixture
of living, dead and very dead OM
for a LONG TIME
Living organisms
Recent residues
Stabilized
SOM
Adapted from Magdoff and Weil (2003)
Historically often
called HUMUS
Does it
matter if
these
residues
are of
plant vs.
microbial
origin?
How does
management
impact the
synthesis &
stabilization
of microbial
residues?
19. The authors present a conceptual framework -
the microbial carbon pump (MCP) to demonstrate how
microorganisms are an active player in soil C storage.
The MCP couples microbial production of organic
compounds to their further stabilization, which the
authors define as the entombing effect (EE).
Nature Microbiology - 2017
Microbes take apart organic matter but they also synthesize it
20. ex vivo modification = extracellular enzymes attack and transform
plant residues, resulting in accumulation of plant-derived compounds
that are not readily assimilated by microorganisms
in vivo turnover = cell uptake of organic substrates –> biosynthesis
resulting in deposition of compounds produced by microbes
Through these 2 pathways, compounds are produced that are more
resistant to further degradation and/or more readily stabilized by
interactions with the soil mineral matrix.
A growing body of evidence indicates that the in vivo pathway
is MORE important for C stabilization than ex vivo modification
2 major pathways by which microorganisms
influence C stabilization
21. Net stabilization of C when EE > PE
Priming effect =
stimulation of
decomposition by
fresh additions
22. The long-term storage of organic forms of
N in soils was classically attributed to
chemical complexity of plant residues that
retarded microbial degradation. Recent
advances have revised this framework,
with the understanding that persistent soil
organic N consists largely of chemically
labile, microbially processed organic
compounds. Chemical bonding to
minerals and physical protection in
aggregates are more important to long-
term preservation of these organic
compounds than molecular complexity…
23. Soil fungi can form mineral-stabilized SOM
not only by modifying SOM but also by
synthesizing mineral surface reactive metabolites
24. Adapted from Carter (2002)
mineral protected OM
Intra-
aggregate OM
Free OM
What regulates the
abundance of these
SOM fractions?
Can the protective
mechanisms
be saturated?
Compartments of varying connectivity
between SOM and the mineral matrix
physically protected OM
25. Geoderma - 2016
The proportion of residues physically
protected within aggregates decreases and
priming effects increase when aboveground
C inputs increase - leading to lower rates
of long-term C stabilization when
aboveground residue additions are high.
Potential explanation
of why high crop
yields often do NOT
result in much
change in SOM???
26. High above ground residue inputs = low efficiency of SOM stabilization
(Shahbaz et al., 2016)
27. Functionally diverse perennial and cover
cropped rotations increased both C input
and SOC concentrations, potentially by
exploiting niches in time that would
otherwise be unproductive, that is,
increasing the “perenniality” of
crop rotations.
28. Permanganate oxidizable C better reflected
practices that promote organic matter
accumulation or stabilization and therefore
can be a useful indicator of long-term
soil C sequestration.
Conversely, mineralizable C (aka soil
respiration during a short incubation) better
reflected practices that promote organic
matter mineralization and therefore can be a
useful indicator of short-term soil nutrient
availability.
Measuring what matters = understanding connection between form and function
30. In fall 2017, students in my Soil Properties class brought in paired soils
(Crop field vs Fence Row) from their farms. In all cases, the fence row
soils had higher soil respiration in 24 hrs after wetting.
31. The SituResp method is a reliable method for
performing a $low cost$ assessment of soil
microbial activity that could be used for soil
health monitoring.
< 1/10th the cost of SOLVITA
32. (Thoumazeau et al, 2017)
Cuvettes containing pH indicator Cresol Red in agar gel can
provide a cheap yet sensitive measurement of respiration
34. Research based on alkali extraction assumes that
large recalcitrant humus molecules are created by a
process of humification; however, these humic
substances appear to be artifacts of the extraction
process and have not been observed in soil using
modern analytical techniques.
Nature - 2015 High profile rejection of
traditional humus concepts
35. At the next Soil Science Society of America meeting
(January 2019 in San Diego), there will be a day-
long special session focused on whether soil humic
research has any meaning/value.
There will be a morning debate between proponents
and opponents of humic acid extraction and
characterization and afternoon poster session and
oral session for volunteered presentations.
The two sides will each write a review paper using a
shared theme for publication in the Journal of
Environmental Quality, and likely more review
papers will follow.
personal communication w/ Dan Olk
36. Highlights
• We analyzed data from 60 published studies and
global databases with > 50,000 measurements.
• A 1% increase in C increased plant available water by
only 1.2% of soil volume on average.
European Journal of Soil Science - 2017
1” of
additional
plant
available
water in the
top 3 feet =
1/36” = 2.8%
Everyone knows that SOM increases plant available water but is this true?
37. Model developed using data from > 2000 soils
useful tool for teaching soil water concepts
39. Water movement
(infiltration & percolation)
and rooting depth/volume
(from which crops acquire water)
are far more responsive to↑C
than water holding capacity
http://soilandwater.bee.cornell.edu/research/pfweb/educators/intro/macroflow.
40. Saturation deficit
Saturation of capacity
Actual C
Practically
attainable C
Potential C
(Dick and Gregorich, 2004)
Disturbance factors
Input factors
capacity factors
management
= opportunity
Residue yield
Impact on synthesis
and stabilization of
microbial residues???
41. Fields or parts of fields with the lowest OM content
(relative to their potential) will benefit the most from
practices that build SOM.
42. Is there a practical way to predict a soils potential?
43. Bingham, AH and MF Cotrufo. (2016). Organic nitrogen storage in mineral soil: Implications for policy and management. Science of the Total Environment. 551–552: 116–126.
Bouma, J; Van Ittersum, M; Stoorvogel, J; Batjes, N; Droogers, P and M Pulleman. (2017). Soil Capability: Exploring the functional potentials of soils. In: Field, D; Morgan, C
and A McBratney. (eds). Global Soil Security. Springer International Publishing. (Part of the series Progress in Soil Science) p.27-44.
Deluca, T. (1995). Conventional row crop agriculture: putting America’s soils on a whitebread diet: Journal of Soil and Water Conservation. 50(3): 262-263
Dick, WA and Gregorich, EG. (2004). Developing and maintaining soil organic matter levels. Managing Soil Quality: Challenges in Modern Agriculture. CAB International. 103-
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Permanganate-Oxidizable Carbon and Mineralizable Carbon for Assessment of Organic Matter Stabilization and Mineralization. Soil Science Society of America Journal. 80.
10.2136/sssaj2016.04.0106.
King, A and J Blesh. (2017). Crop rotations for increased soil carbon: perenniality as a guiding principle. Ecological Applications. 28. 10.1002/eap.1648.
Lehmann, J and M Kleber. (2015). The contentious nature of soil organic matter. Nature. 528. 10.1038/nature16069.
Liang, C; Schimel, J and J Jastrow. (2017). The importance of anabolism in microbial control over soil carbon storage. Nature Microbiology. 2. 17105.
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