This document discusses considerations for weed and herbicide management in no-till systems. It covers how tillage affects weed germination by disturbing the soil environment. Crop residue retention influences weed emergence through temperature, moisture and chemical effects. The efficacy of pre-emergent herbicides improves with more soil disturbance from tillage, as it increases herbicide incorporation. In no-till systems, herbicides work through positional selectivity as minimal soil is thrown, separating seeds from herbicide treatment. Application guidelines recommend optimizing herbicide rates based on soil disturbance from the seeding equipment and integrating herbicides with other integrated weed management practices to reduce weed populations and herbicide resistance.
1. Mycorrhiza plays an important role to establish forest in unfavourable location, barren land, waste lands etc.
2. Trees with facultative endomycorrhiza act as first invader in waste lands as pioneer in plant succession.
3. The application of mycorrhizal fungi in forest bed enhances the formation of mycorrhizal association that prevents the entry of fungal root pathogens. This method is very much effective in the root of Pinus clausa against Phytophthora cinnamoni infection.
4. Mycorrhiza mixed nitrogenous compounds such as nitrate; ammonia etc. is available to the plants. Thus it helps in plant growth, especially in acid soil.
Arbuscular mycorrhizal fungi (Glomus mosseae) selection by date palm root sys...AI Publications
In Jerid region pedoclimatic conditions and agricultural practices are of major importance in shaping the arbuscular mycorrhizal fungi in the rhizophere of date palm tree. Glomus mosseae (dominant species) isolated from soil was multiplied and used as inoculum for date palm seedling. For this study, a pot experiment was conducted under greenhouse condition to assess the effect of inoculation with arbuscular mycorhizal fungus (Glomus mosseae) and mycorrhizal soil (substrate containing the propagules) compared to control seedlings. The result of analysis carried out in this work revealed that the addition of mycorrhizal fungi (Glomus mosseae) and mycorrhizal soil allowed us to conclude that the increase in phosphorus and nitrogen availability in soil solutions leads to a decrease in mycorhization rate and vice versa. Furthermore there is a good correlation between these two parameters. The levels of exchangeable calcium and magnesium tend to increase slightly over time estimated that their absorption mechanism is the same as for phosphorus. The absorption of these elements often difficult to assimilate by the plant is improved by the mycorrhizal association. That is to say, the increase in their removal is mainly due to better exploration of the soil by extra-rooted hyphae. In addition, endomycorrhizae are much less influenced by certain interactions between soil elements. Greenhouse experiments clearly show that artificial inoculation with mycorrhizal soil and spores (Glomus mosseae) has led to an improvement in the fertility of soils used as a substrate for culture, with a superiority of infection caused by mycorrhizal soil.
1. Mycorrhiza plays an important role to establish forest in unfavourable location, barren land, waste lands etc.
2. Trees with facultative endomycorrhiza act as first invader in waste lands as pioneer in plant succession.
3. The application of mycorrhizal fungi in forest bed enhances the formation of mycorrhizal association that prevents the entry of fungal root pathogens. This method is very much effective in the root of Pinus clausa against Phytophthora cinnamoni infection.
4. Mycorrhiza mixed nitrogenous compounds such as nitrate; ammonia etc. is available to the plants. Thus it helps in plant growth, especially in acid soil.
Arbuscular mycorrhizal fungi (Glomus mosseae) selection by date palm root sys...AI Publications
In Jerid region pedoclimatic conditions and agricultural practices are of major importance in shaping the arbuscular mycorrhizal fungi in the rhizophere of date palm tree. Glomus mosseae (dominant species) isolated from soil was multiplied and used as inoculum for date palm seedling. For this study, a pot experiment was conducted under greenhouse condition to assess the effect of inoculation with arbuscular mycorhizal fungus (Glomus mosseae) and mycorrhizal soil (substrate containing the propagules) compared to control seedlings. The result of analysis carried out in this work revealed that the addition of mycorrhizal fungi (Glomus mosseae) and mycorrhizal soil allowed us to conclude that the increase in phosphorus and nitrogen availability in soil solutions leads to a decrease in mycorhization rate and vice versa. Furthermore there is a good correlation between these two parameters. The levels of exchangeable calcium and magnesium tend to increase slightly over time estimated that their absorption mechanism is the same as for phosphorus. The absorption of these elements often difficult to assimilate by the plant is improved by the mycorrhizal association. That is to say, the increase in their removal is mainly due to better exploration of the soil by extra-rooted hyphae. In addition, endomycorrhizae are much less influenced by certain interactions between soil elements. Greenhouse experiments clearly show that artificial inoculation with mycorrhizal soil and spores (Glomus mosseae) has led to an improvement in the fertility of soils used as a substrate for culture, with a superiority of infection caused by mycorrhizal soil.
Degradation of Herbicides Under Dry ConditionsDuPont Pioneer
In years following extended drought, several agronomic issues often arise, including that of potential herbicide carryover. This article discusses herbicide degradation in soils, how it is affected by droughty conditions, and the primary pathways by which some specific herbicide chemistries degrade. This information is helpful to growers who need to diagnose herbicide carryover issues.
Soil pollution is defined as the build-up in soils of determined toxic compounds, chemicals, salts, radioactive materials, or disease causing agents, which have adverse effects on plant growth and animal health.
# Main Causes of Soil Pollution
# What Diseases Does Pollution Cause
# Soil Pollution and Its Effects
# Methods to control soil pollution
# How soil pollution and soil erosion could be prevented
Soil organic matter has long been recognized as one of the most important components in maintaining soil fertility, soil quality, and agricultural sustainability. The soil zone strongly influenced by plant roots, the rhizosphere, plays an important role in regulating soil organic matter decomposition and nutrient cycling. Processes that are largely controlled or directly influenced by roots are often referred to as rhizosphere processes. These processes may include exudation of soluble compounds, water uptake, nutrient mobilization by roots and microorganisms, rhizosphere-mediated soil organic matter decomposition, and the subsequent release of CO2 through respiration. Rhizosphere processes are major gateways for nutrients and water. At the global scale, rhizosphere processes utilize approximately 50% of the energy fixed by photosynthesis in terrestrial ecosystems, contribute roughly 50% of the total CO2 emitted from terrestrial ecosystems, and mediate virtually all aspects of nutrient cycling. Therefore, plant roots and their rhizosphere interactions are at the center of many ecosystem processes. However, the linkage between rhizosphere processes and soil organic matter decomposition is not well understood. Because of the lack of appropriate methods, rates of soil organic matter decomposition are commonly assessed by incubating soil samples in the absence of vegetation and live roots with an implicit assumption that rhizosphere processes have little impact on the results. Our recent studies have overwhelmingly proved that this implicit assumption is often invalid, because the rate of soil organic matter decomposition can be accelerated by as much as 380% or inhibited by as much as 50% by the presence of live roots. The rhizosphere effect on soil organic matter decomposition is often large in magnitude and significant in mediating plant-soil interactions.
Effect of arbuscular mycorrhiza fungi on the growth, nutrient uptake, root in...Innspub Net
The effect of Arbuscular mycorrhiza (AM) fungi on growth, nutrient uptake and root infectivity was determined in Rough Lemon (Citrus jambhiri) seedlings raised under four phosphorus regimes in sand culture and also in sand/nitrosol sterile and unsterile conditions. Inoculation with AM fungi increased the plant height, leaf number and stem girth in relation to un-inoculated seedlings grown under equivalent P concentrations. An increase in plant height, leaf number and stem girth also occurred in both inoculated sterile and un-sterile sand/nitrosol media in relation to un-inoculated sterile and unsterile media. Arbuscular mycorrhiza also increased the leaf area and the root, leaf and stem fresh and dry weights and also caused an increase in the uptake of phosphorus and potassium in the leaf tissues. It also favoured mycorrhizal infectivity of roots and increased the root absorptive surface area. This study indicates that AM fungi improves the capacity of tropical fruit to absorb and utilize plant nutrients possibly by increasing the effective root surface area from which available form of nutrients are absorbed and also by increasing access of roots by bridging the depletion zones. Inoculating seedlings with arbuscular mycorrhizal fungi helps to alleviate the adverse effects of global warming and climate change. As a low-cost technology, arbuscular mycorrhizal inoculation is recommended as part of the regular practice for incorporating into nursery media used for tropical fruit seedling propagation.
Mulching and Weed Control
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For more information, Please see websites below:
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Organic Edible Schoolyards & Gardening with Children
http://scribd.com/doc/239851214
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Double Food Production from your School Garden with Organic Tech
http://scribd.com/doc/239851079
`
Free School Gardening Art Posters
http://scribd.com/doc/239851159`
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Increase Food Production with Companion Planting in your School Garden
http://scribd.com/doc/239851159
`
Healthy Foods Dramatically Improves Student Academic Success
http://scribd.com/doc/239851348
`
City Chickens for your Organic School Garden
http://scribd.com/doc/239850440
`
Simple Square Foot Gardening for Schools - Teacher Guide
http://scribd.com/doc/239851110
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Weed & herbicide considerations in conservation agriculture
1. Weed and Herbicide Considerations Tillage and weed germinationResidue effect on weeds Herbicide in no till Guidelines for pre emergent herbicide Jack McHugh Jeff Esdaile Contributions from Dr Jack Desbiolles (Ashworth et al., 2010) and Baker et al., (2007)
2. Tillage and weed germination Germination affected by: Tillage, Climate & Soil type Tillage effects microenvironment; Light, O2,CO2 diffusion, Temp, N and Soil structure – breaks down dormancy and stimulates germination. Low soil disturbance disc seeding systems = a shallow weed seed bank – affected by herbicides, low germination rates & predation Deep seed bank - long term seed viability, weed reinfestation if brought to the surface.
3. Soil Facts – Saskatchewan soil conservation association 2001
4. Residue effect on weeds Crop residue retention influences weed germination – temperature, moisture, chemical interactions. Affects growth of bothcrop and weeds – soil to seed contact, N tie up, reduced soil temp, increased root diseases, release of phytotoxins Effect on weed emergence is complex: Type and quantity of residue Allelopathy Weed species Seed depth Soil type Environmental conditions Interaction with herbicides The efficacy or pre emergent herbicides improves under higher disturbance disc seeding systems due to increased incorporation
5.
6. Herbicide in no till Pre-emergent herbicides were introduced to combat resistance in post emergence herbicides. Trifluralin (treflan) is incorporated (photodecompostion) by soil throw near the surface. Other chemicals can be toxic to crop seeds at high rates
7. Herbicide in no till Furrow free of herbicide – treated soil is thrown and mixed between furrows Minimum disturbance, minimises mixing of soil and weeds to depth - Small amount of soil throw. Efficacy controlled by positional selectivity – seed & herbicide separation Performance is a function of amount and pattern of soil throw Leading fluted coulters are effective (dbl discs drag herbicide into furrow) Triple discs appear to perform the best (speed and layout is a factor) Hair pinning a significant issue + soft wet clay
8. Guidelines for pre emergent herbicide Pre plant knockdown – emerging weeds Optimise application rates – with separation 1.5-2 L/ha in cultivation systems 0.8L/ha = less effective Travel speed – Disturbance and throw affected by speed, depth, soil texture and moisture – avoid throw to adjacent seeding rows – monitor closely Stubble – herbicide efficacy reduced by 40-50% if not on the soil IWM – integrated weed management reduces weed burden and limits evolution of resistance