Lec-1-Site-Selection (1).ppt("Unlocking Success: A Comprehensive Guide to Str...EricColubanAlipan
This comprehensive PPT guide delves into the intricacies of effective site selection, offering invaluable insights for businesses, developers, and decision-makers. Explore key considerations, from demographic analysis to accessibility, to make informed choices that align with your objectives. Whether you're launching a new venture or expanding operations, this document equips you with the knowledge to navigate the complexities of site selection successfully.
site specific. nutrient. management.pptxshivalika6
Site – specific nutrient management is the dynamic, field specific management of nutrients in a particular cropping season to optimize the supply and demand of nutrients according to their differences in cycling through soil-plant systems.
Lec-1-Site-Selection (1).ppt("Unlocking Success: A Comprehensive Guide to Str...EricColubanAlipan
This comprehensive PPT guide delves into the intricacies of effective site selection, offering invaluable insights for businesses, developers, and decision-makers. Explore key considerations, from demographic analysis to accessibility, to make informed choices that align with your objectives. Whether you're launching a new venture or expanding operations, this document equips you with the knowledge to navigate the complexities of site selection successfully.
site specific. nutrient. management.pptxshivalika6
Site – specific nutrient management is the dynamic, field specific management of nutrients in a particular cropping season to optimize the supply and demand of nutrients according to their differences in cycling through soil-plant systems.
by Terrence T. Nennich, Extension Educator, University of Minnesota and Carl Rosen, Professor, Dept. of Soil, Water and Climate, University of Minnesota.
Presented at the 2015 Minnesota Statewide High Tunnel Conference, Beginning Grower Workshop.
Plant nutrition is only one of more than fifty factors which directly affect both crop yield and quality. The availability
of required nutrients, together with the degree of interaction between these nutrients and the soil, play a vital role in crop development.
High soil fertilty = high food production
Establish soil fertlity with soil tests
With only one soil test > 20 soil characteristics can be measured.
Based on a single soil test fertilzation recommendations are given, but also additional information like a soil organic matter balance, and a water retention curve is given to farmers and their extension services.
Gypsum and Precision Technology ExperienceTerry Weaver
See how farmers employee technology to precisely apply the nutrients crops need reducing costs and increasing yields. Gypsum reduces soil erosion and sediment runoff keeping nutrients where farmers need them. In the field for crops to utilize.
This presentation was given at the 2019 Catchment Management Notwork meeting, which was held on the 11 October in Tullamore. All our local authorities and other bodies responsible for implementing the Water Framework Directive in Ireland attended to share knowledge and learn from each other.
UNDERSTANDING WHAT GREEN WASHING IS!.pdfJulietMogola
Many companies today use green washing to lure the public into thinking they are conserving the environment but in real sense they are doing more harm. There have been such several cases from very big companies here in Kenya and also globally. This ranges from various sectors from manufacturing and goes to consumer products. Educating people on greenwashing will enable people to make better choices based on their analysis and not on what they see on marketing sites.
by Terrence T. Nennich, Extension Educator, University of Minnesota and Carl Rosen, Professor, Dept. of Soil, Water and Climate, University of Minnesota.
Presented at the 2015 Minnesota Statewide High Tunnel Conference, Beginning Grower Workshop.
Plant nutrition is only one of more than fifty factors which directly affect both crop yield and quality. The availability
of required nutrients, together with the degree of interaction between these nutrients and the soil, play a vital role in crop development.
High soil fertilty = high food production
Establish soil fertlity with soil tests
With only one soil test > 20 soil characteristics can be measured.
Based on a single soil test fertilzation recommendations are given, but also additional information like a soil organic matter balance, and a water retention curve is given to farmers and their extension services.
Gypsum and Precision Technology ExperienceTerry Weaver
See how farmers employee technology to precisely apply the nutrients crops need reducing costs and increasing yields. Gypsum reduces soil erosion and sediment runoff keeping nutrients where farmers need them. In the field for crops to utilize.
This presentation was given at the 2019 Catchment Management Notwork meeting, which was held on the 11 October in Tullamore. All our local authorities and other bodies responsible for implementing the Water Framework Directive in Ireland attended to share knowledge and learn from each other.
UNDERSTANDING WHAT GREEN WASHING IS!.pdfJulietMogola
Many companies today use green washing to lure the public into thinking they are conserving the environment but in real sense they are doing more harm. There have been such several cases from very big companies here in Kenya and also globally. This ranges from various sectors from manufacturing and goes to consumer products. Educating people on greenwashing will enable people to make better choices based on their analysis and not on what they see on marketing sites.
"Understanding the Carbon Cycle: Processes, Human Impacts, and Strategies for...MMariSelvam4
The carbon cycle is a critical component of Earth's environmental system, governing the movement and transformation of carbon through various reservoirs, including the atmosphere, oceans, soil, and living organisms. This complex cycle involves several key processes such as photosynthesis, respiration, decomposition, and carbon sequestration, each contributing to the regulation of carbon levels on the planet.
Human activities, particularly fossil fuel combustion and deforestation, have significantly altered the natural carbon cycle, leading to increased atmospheric carbon dioxide concentrations and driving climate change. Understanding the intricacies of the carbon cycle is essential for assessing the impacts of these changes and developing effective mitigation strategies.
By studying the carbon cycle, scientists can identify carbon sources and sinks, measure carbon fluxes, and predict future trends. This knowledge is crucial for crafting policies aimed at reducing carbon emissions, enhancing carbon storage, and promoting sustainable practices. The carbon cycle's interplay with climate systems, ecosystems, and human activities underscores its importance in maintaining a stable and healthy planet.
In-depth exploration of the carbon cycle reveals the delicate balance required to sustain life and the urgent need to address anthropogenic influences. Through research, education, and policy, we can work towards restoring equilibrium in the carbon cycle and ensuring a sustainable future for generations to come.
Altered Terrain: Colonial Encroachment and Environmental Changes in Cachar, A...PriyankaKilaniya
The beginning of colonial policy in the area was signaled by the British annexation of the Cachar district in southern Assam in 1832. The region became an alluring investment opportunity for Europeans after British rule over Cachar, especially after the accidental discovery of wild tea in 1855. Within this historical context, this study explores three major stages that characterize the evolution of nature. First, it examines the distribution and growth of tea plantations, examining their size and rate of expansion. The second aspect of the study examines the consequences of land concessions, which led to the initial loss of native forests. Finally, the study investigates the increased strain on forests caused by migrant workers' demands. It also highlights the crucial role that the Forest Department plays in protecting these natural habitats from the invasion of tea planters. This study aims to analyze the intricate relationship between colonialism and the altered landscape of Cachar, Assam, by means of a thorough investigation, shedding light on the environmental, economic, and societal aspects of this historical transformation.
Epcon is One of the World's leading Manufacturing Companies.EpconLP
Epcon is One of the World's leading Manufacturing Companies. With over 4000 installations worldwide, EPCON has been pioneering new techniques since 1977 that have become industry standards now. Founded in 1977, Epcon has grown from a one-man operation to a global leader in developing and manufacturing innovative air pollution control technology and industrial heating equipment.
Willie Nelson Net Worth: A Journey Through Music, Movies, and Business Venturesgreendigital
Willie Nelson is a name that resonates within the world of music and entertainment. Known for his unique voice, and masterful guitar skills. and an extraordinary career spanning several decades. Nelson has become a legend in the country music scene. But, his influence extends far beyond the realm of music. with ventures in acting, writing, activism, and business. This comprehensive article delves into Willie Nelson net worth. exploring the various facets of his career that have contributed to his large fortune.
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Introduction
Willie Nelson net worth is a testament to his enduring influence and success in many fields. Born on April 29, 1933, in Abbott, Texas. Nelson's journey from a humble beginning to becoming one of the most iconic figures in American music is nothing short of inspirational. His net worth, which estimated to be around $25 million as of 2024. reflects a career that is as diverse as it is prolific.
Early Life and Musical Beginnings
Humble Origins
Willie Hugh Nelson was born during the Great Depression. a time of significant economic hardship in the United States. Raised by his grandparents. Nelson found solace and inspiration in music from an early age. His grandmother taught him to play the guitar. setting the stage for what would become an illustrious career.
First Steps in Music
Nelson's initial foray into the music industry was fraught with challenges. He moved to Nashville, Tennessee, to pursue his dreams, but success did not come . Working as a songwriter, Nelson penned hits for other artists. which helped him gain a foothold in the competitive music scene. His songwriting skills contributed to his early earnings. laying the foundation for his net worth.
Rise to Stardom
Breakthrough Albums
The 1970s marked a turning point in Willie Nelson's career. His albums "Shotgun Willie" (1973), "Red Headed Stranger" (1975). and "Stardust" (1978) received critical acclaim and commercial success. These albums not only solidified his position in the country music genre. but also introduced his music to a broader audience. The success of these albums played a crucial role in boosting Willie Nelson net worth.
Iconic Songs
Willie Nelson net worth is also attributed to his extensive catalog of hit songs. Tracks like "Blue Eyes Crying in the Rain," "On the Road Again," and "Always on My Mind" have become timeless classics. These songs have not only earned Nelson large royalties but have also ensured his continued relevance in the music industry.
Acting and Film Career
Hollywood Ventures
In addition to his music career, Willie Nelson has also made a mark in Hollywood. His distinctive personality and on-screen presence have landed him roles in several films and television shows. Notable appearances include roles in "The Electric Horseman" (1979), "Honeysuckle Rose" (1980), and "Barbarosa" (1982). These acting gigs have added a significant amount to Willie Nelson net worth.
Television Appearances
Nelson's char
Characterization and the Kinetics of drying at the drying oven and with micro...Open Access Research Paper
The objective of this work is to contribute to valorization de Nephelium lappaceum by the characterization of kinetics of drying of seeds of Nephelium lappaceum. The seeds were dehydrated until a constant mass respectively in a drying oven and a microwawe oven. The temperatures and the powers of drying are respectively: 50, 60 and 70°C and 140, 280 and 420 W. The results show that the curves of drying of seeds of Nephelium lappaceum do not present a phase of constant kinetics. The coefficients of diffusion vary between 2.09.10-8 to 2.98. 10-8m-2/s in the interval of 50°C at 70°C and between 4.83×10-07 at 9.04×10-07 m-8/s for the powers going of 140 W with 420 W the relation between Arrhenius and a value of energy of activation of 16.49 kJ. mol-1 expressed the effect of the temperature on effective diffusivity.
Top 8 Strategies for Effective Sustainable Waste Management.pdfJhon Wick
Discover top strategies for effective sustainable waste management, including product removal and product destruction. Learn how to reduce, reuse, recycle, compost, implement waste segregation, and explore innovative technologies for a greener future.
2. Objectives
Understand objectives of soil fertility
management
Philosophies/techniques of precision farming
Using & obtaining valid soil samples
Considerations in making/following fertilizer
recommendations
Knowledge of fertilizer quality
How to calculate fertilizer blends
Fertilizer application methods
Benefits/limitations of manure use
3. Introduction
Fertilizer is one management option
used almost universally
Must replace soil nutrients lost by
harvest
Over-fertilization can result in
dangerous pollution
Technology has increased fertilizer
efficiency
5. Goals & Concerns in
Fertility Management
Efficient land managers: spend <20%
of production costs on fertilizers,
expect >50% increase in yields
Fertilizers may not be profitable if:
– Water is the most limiting factor
– Other growth hindrances – insects,
diseases, acidity, extreme cold
– Increased yield has less market value
than the cost of buying/app of fertilizer
6. Goals & Concerns in
Fertility Management
Fertilizers – generally most profitable
farm input
Soil fertility problems usually the
easiest to solve
Soil nutrients typically present in finite
amounts, don’t replenish themselves
Crops typically contain: (in rank of
amount found in the plant) N, K, Ca,
P, Mg, S
7. Goals & Concerns in
Fertility Management
Utilizing fertilizers may help cut unit
cost of production by maximizing yield
– Improved fertility = improved yields,
improved aesthetic appeal
Environmental concerns abound
– Fertilizer laws viewed as lax by some
– Farmers may be the primary cause of
non-point-source pollution
8. Goals & Concerns in
Fertility Management
– Three common pollutants:
Nitrates
– Percolate through to groundwater
– Not safe to drink
– Cause “Blue-baby” syndrome – inhibits
oxygenation of blood
– Becoming common near heavily fertilized fields,
feedlots, dairies
Phosphates
– Pollute surface waters by runoff
– Promotes algae growth in rivers/ponds
– Depletes available oxygen in the water for fish
9. Goals & Concerns in
Fertility Management
– Wise use of fertilizers must be
encouraged, actually improve the
environment
Crops, trees, etc. - remove more CO2,
decrease sediment, dust, erosion
Plays important role for future of the planet
10. Scale of Land
Management
Large- & Medium-Scale Management
– Large-Scale
Low levels of operational precision, little
reliance on sophisticated technology
May be most feasible/profitable for some
Simple & low-tech
Some shy away from high tech for other
reasons
11. Scale of Land
Management
Disadvantages
– Some parts of field may receive too much/little
fertilizer or pesticide
– Less than optimal yields
– Inefficient use of fertilizers & pesticides
– Higher cost of production/unit
– Environmental pollution due to over application
Advantages
– Minimal technological training & instrumentation
needed
– Field operations can be performed w/ standard,
readily available, cheaper equipment
12. Scale of Land
Management
– Medium-Scale
Subdivide field into two+ management units
– Delineation may be based on:
Soil types
Past management differences
Farmer’s observations
Ex. High, medium, low N application areas in
the field
Same equipment/technology needs as for
large-scale management farmers
13. Scale of Land
Management
Does improve efficiency of farm inputs
Can reduce excessive applications of
chemicals/fertilizers
– May do spot treatments/applications w/in a field
due to field observations
Small-Scale Management (Precision
Farming)
– Global Positioning System (GPS) –
network of U.S. satellites w/ a signal
detection system used to locate positions
on the ground
14. Scale of Land
Management
– Soil sample fields on a grid
– Data collection points no more than a few
feet apart
– Each sample site mapped using GPS
– Custom applicators can custom apply
fertilizers at variable rates that change
constantly as the applicator travels the
field – variable rate application, site-
specific management, precision farming
15. Scale of Land
Management
– Potential to substantially decrease
fertilizer/chemical application rates
– Potential to substantially decrease input
costs
– Does require expensive technology,
equipment & extensive technical
knowledge
16. Soil Sampling
Standard method for determining soil
fertility
Use w/ precision farming to minimize
inputs
Accuracy of sample is key!!!!
17. Soil Sampling
Depth & Number of Samples
– Sampling depth – 7-12” for typical soil
analysis
Shallower depth for no-till/sod crops – acid-
layer can form at very top of soil structure
For accurate N analysis – 24-36” depth
– For composite sampling – fewer #
samples decreases accuracy of analysis
18. Soil Sampling
Sampling Frequency, Time, & Location
– New land, land new to you – yearly for 1st
few yrs until you understand the soil
– Every 2-3 yrs, unless concern for
environmental problems
– Analysis – determines which nutrients can
be made available in the soil & which will
need to be supplied
– Samples often pulled in fall to provide
enough time for analysis/amendments
19. Soil Sampling
Spring sampling is more accurate, but
conditions may not be favorable, or not
sufficient time
– Sampling row crops problematic
Can hit a fertilizer zone
Hard to get enough representative samples
20. Soil Sampling
Uniformity of Sampling Areas
– Examine field for differences in soil
characteristics, past treatments
– Consider:
Uniformity of productivity
Topography
Soil texture
Soil structure
Drainage
Depth/color topsoil
Past management
21. Soil Sampling
– Sampling area
Each composite sample should represent
<12.5 ac
– Grid sampling can be as small as you need
– 5-10 ac grids are common
Providing Detailed Soil & Cropping
Background
– Helps to provide w/ soil analysis to
increase accuracy of fertilizer
recommendations
22. Soil Sampling
– Include:
Previous crop
Crop (s)) to be grown
Realistic yield goal
Last liming & fertilization rates
Manure applications
Soil series (if known)
Drainage info
If irrigation used
23. Soil Sampling
Other problems:
– Temp, geographic location, elevation, farming
practices, etc.
24. Soil Tests
Law of the Minimum: growth of the
plant is limited most by the essential
plant nutrient present in the least
relative amount (first-limiting)
Soil Acidity Evaluation
– pH measured w/ electrode & solution
– Lime requirement – amount of lime
required to achieve desired pH
Reported as buffer pH
25. Soil Tests
Soil Test for N
– No good tests for soil available N
– Most states provide N recommendations based
on yrs of field plots trials on various crops, soils,
management, fertilizers
– N recommendations consider:
Previous crops
Estimates N carryover
N needed to decompose residues
Projected yields
Climate
26. Soil Tests
– Lab N tests accurate, but nearly
impossible to interpret
Some will discourage N testing
– Behavior of carryover N unpredictable –
can make analyses invalid
Leaching
Denitrification
Mineralization
Climate
27. Soil Tests
– N recommendations based on yield goals
rather than soil reserves
– Corn Rule – 1.2-1.4#N/bu of yield goal
How much N should be recommended for
corn following corn, expected yield 120
bu/ac?
How much N should be recommended for
corn following soybeans, expected yield 195
bu/ac?
28. Soil Tests
Soil Tests for P & K
– Widely used to predict probability of crop
response to fertilization
– Survey:
47% soil tested medium to low for P
43% soil tested medium to low for K
P & K soil levels declining in many states
– P testing
Quite reliable – soil P is very stable from yr to
yr
29. Soil Tests
Most soil P unavailable to crops
Soil test extracts & measures what may
actually be available
– K testing
Tests both exchangeable & soluble reserves
Conflicting testing procedures over which is
most accurate
– Some estimate upper threshold needs ~159-
246#/ac (above which no response to K fertilizer)
– Others - 335#/ac on clay soils (calculated based
on soil CEC – higher CEC = decreased available K)
– Some experimentation w/ soil probes
checking K, NO3, PO4, SO4
30. Soil Tests
Soil Test for Ca & Mg
– Related to need for lime
– Well-limed soils rarely Ca & Mg deficient
– Mg deficiency more common than Ca
Coarse-textured or acidic soils
Many yrs using non-Mg containing lime
– Mg testing for:
Exchangeable soil Mg
% Mg saturation of soil colloids
Ratio of K:Mg
31. Soil Tests
Soil Test for S & B
– S testing inaccurate – acts much like N
Can test – but must take variability into
account
– Boron level recommendations
<1.0 ppm – deficient for plant growth
1-5.0 ppm – adequate
>5.0 ppm – excess/toxicity risks
32. Soil Tests
Soil Test for Micronutrient Needs
– Difficult to develop accurate tests due to
relatively infrequent need for field
supplementation
– Can be done, if requested for a specific
need
– Adds expense to soil analysis
33. Soil Tests
How Good Is Soil Testing?
– Analyses recalibrated regularly based on
field trial studies
– Validity of analysis related directly to
accuracy of sample, information provided
to the lab
– Soil analyses generally very valid for: P,
K, soluble salts, pH, lime
Other tests should only be used on as-needed
basis
– Extra cost
– Less accurate
34. Analysis of Plants
Only way to be sure of soil nutrient
availability
Plant Analysis vs. Soil Testing
– Plant most accurate report on what
nutrients are actually available
– Plant analysis leaves little to no room for
amendments to the soil
– When deficiencies are acknowledged,
yield usually already affected
35. Analysis of Plants
– When is plant analysis most helpful?
Treatment of an easily-corrected deficiency
Long-growing crops: turf, tree fruits, forests,
sugar cane
Quick Tests in the Field
– Can test for N, K status in plants
Collect ~20 leaves for sample
– Must be random from different locations
– Don’t select only affected-looking leaves
36. Analysis of Plants
Chop/mix, squeeze sap & test
Most effective for greenhouse/nursery growers
– Amendments can easily be made
– High possible economic losses
Total Plant Analysis
– Done in a lab
– Should be tested by stage of development
– Random sampling key
37. Analysis of Plants
– Indicate part of plant sampled & be
consistent
– Dry to prevent spoilage (confounds
results)
– Wrap in paper and mail w/ complete
report – complete history, information
critical
38. Analysis of Plants
Interpreting Plant Analyses
– Accurate interpretation difficult if not all
critical information provided
– Element classified as deficient if below
threshold nutrient levels
Levels change through season, stage of
development, etc.
– Some general disagreement from
scientists on what threshold levels are
39. Analysis of Plants
Critical Nutrient Range
– CNR – ranges at which nutrients are:
Visually deficient
Hidden deficient
Slightly deficient
Sufficient supply
Toxic
40. Analysis of Plants
Visual Nutrient Deficiency Symptoms
– Chlorosis – yellowish to whitish
appearance to foliage, stem
– Necrosis – dead tissue
– Causes: disease, insect damage, salt
accumulation, stress, nutrient deficiencies
– Some visual symptoms same for many
diseases/deficiencies
41. Analysis of Plants
– Nutrients are relocated in the plant by
two pathways
Xylem – water-carrying vessels
– All nutrients can pass through
Phloem – sugar-carrying vessels
– Not all nutrients can relocate
– Mobile nutrients – travel freely
– Immobile nutrients – can’t be moved from their
location in the plant
– Mobile nutrient deficiencies tend to occur
on older leaves – plant sacrifices old for
new tissue
42. Analysis of Plants
– Immobile nutrient deficiencies –
symptoms on shoot/root tips, fruits
Can’t be treated from the soil w/ fertilizer –
plant can’t send Ca (ex) to the ripening fruit
– Mobile nutrients:
N, P, K, Cl, Mg, S
– Immobile nutrients:
Cu, Mn, Zn, Fe, Mo, S
– Very immobile nutrients:
B, Ca
44. Fertilizer
Recommendations
Developing a Fertilizer
Recommendation
– Must have sufficient plot data to correlate
yields & nutrient needs
– Once a general amount of fertilizer is
known:
Subtract for manure application
Subtract for residual P or N
Add/subtract for N, P, S because of soil
organic matter levels – can count on them
supplying some
46. Fertilizer Quality
Fertilizer grade – amounts of N, P, K in a
fertilizer required by law to be listed
Also required:
– Weight of material, manufacturer
Optional:
– Filler composition, acidity in soil potential
Calculating fertilizer N, P, K amounts
10-20-10
15-12-18
47. Fertilizer Quality
Amounts listed as: elemental N, phosphate,
potash (not direct indication of elemental P, K
supplied)
Acidity & Basicity of Fertilizers
– Most affect soil acidity in some regard
Superphosphate, Triplesuperphosphate,
Potash – neutral
MAP, DAP, all N fertilizers – acidifiers
48. Fertilizer Quality
Solubility & Mobility in Soil
– Function of:
Elemental charge
Tendency to form insoluble compounds
Adsorption ability
Soil texture
Water movement
Concentration of other ions
49. Fertilizer Quality
– Examples
P may only move a few cm
– Must be place in/near root zone
N can move w/ extent of water movement
50. Fertilizer Calculations
Calculating Fertilizer Mixtures
– Mixing 34-0-0 ammonium nitrate & 0-46-
0 TSP to get 1 ton mixture of 15-10-0
How much of each do we need?
– How about if we needed a 12-14-6
fertilizer for a customer?
What might we use for each ingredient?
How much of each would we need?
51. Fertilizer Calculations
Weights of Fertilizer to Apply
– Planting corn expected to yield 125 bu/ac
How much N do we need?
Soil analysis recommended 88#/ac phosphate
How much ammonium nitrate & TSP do we
need?
What is our final application rate?
52. Fertilizer Calculations
Calculations Involving Liquid Fertilizers
– Use dry fertilizer calculation if sold by
weight
– If sold by volume, usually applied by
volume
– See example pg. 336
53. Techniques of Fertilizer
Application
Starter (Pop-Up) Fertilizers
– Addition of fertilizer w/ the seed during
planting, dribbled in a strip near the see,
banding w/in 2” of seed
– Most beneficial for P, K – some for N, but
not as necessary
– Advantages:
Cold soils
Low nutrient levels in the root zone
Fast-growing plants
54. Techniques of Fertilizer
Application
– Disadvantages:
Slows planting
Can burn seedling, if placed too close
Broadcast Application
– Uniform application across entire surface
– Left on surface, or incorporated
– Somewhat less efficiency of fertilizer
Especially when not incorporated quickly
Why?
55. Techniques of Fertilizer
Application
– Reasons to broadcast:
Only practical method of application –
pastures, turf, etc.
Low-fertility soils needing high fertilizer rates
Easy, cheap, personal preference
Flexible – split applications, ability to add
after crop is growing
56. Techniques of Fertilizer
Application
Deep Banding
– Application of strips into the soil
– Either between/side of row, where the
seed may be planted
– Typically 4-12” depth
– Knifing in anhydrous most common
Gas able to dissolve in soil water before it
escapes
Losses can be high if dry, sandy
57. Techniques of Fertilizer
Application
– Disadvantages:
Strong equipment needed
High fuel costs
Danger of dealing w/ anhydrous
– Advantages:
High yield response potential
Puts fertilizer where most roots are, very
efficient use
58. Techniques of Fertilizer
Application
Split Application
– Divided total fertilizer rates delivered in
2+ applications
– Reasons to split applications
If large applications are needed – increase
efficiency of nutrient use
Soil conditions dictate – risk for high nutrient
losses
Control vegetative growth in early stages
59. Techniques of Fertilizer
Application
– Advantages:
Increased efficiency of N utilization
Provide a “boost” to the plant during growth
– Disadvantages:
Extra pass through field
Not effective for P, K because of immobility
60. Techniques of Fertilizer
Application
Side-Dressing or Topdressing
– Side-dressing – surface or shallow band
application put on after crop is growing
Broadcast, surface stripped, sprayed, knifed
– Principles to consider:
Decreases potential N losses
Added in the furrow to allow water to help w/
infiltration
Not effective for P, K
61. Techniques of Fertilizer
Application
Point Injector Application – place P, K
into soil in the root zone w/out
significant root damage
– Used more in small plots, gardens
– Push stick, rod into soil, fill w/ fertilizer,
cover
– Effective for: fruit trees, grapes, shrubs,
etc.
– Not common in field use
62. Techniques of Fertilizer
Application
Fertigation – application of fertilizer w/
irrigation water
– Can apply large quantities of nutrients
– Very effective for N
Some see 30-50% more efficient use of N
Cut of 50% in N rates w/ same/better yield
– Must be careful of potential problem w/
salts
63. Techniques of Fertilizer
Application
– Able to apply when need is highest
– Immediate/convenient application
– Most effective on soils w/ poor nutrient
retention & for mobile nutrients
– Chemigation also possible – not discussed
in depth here
64. Techniques of Fertilizer
Application
Foliar Application – foliage wetted to
maximize nutrient absorption through
leaf stomata & epidermis
– Feasible for: N supplementation,
pesticides, micronutrients, etc.
– Guidelines:
Only suited for applications of small amount
(can burn plant)
Decreased rates can be used
65. Techniques of Fertilizer
Application
Need wetting agent to help the spray to
distribute evenly across surface
Helpful when root conditions restrict nutrient
uptake
Quick response/remedy to deficiency (also
short residual)
Wind must be calm, humidity >70%, temp
<85° F
66. Techniques of Fertilizer
Application
Fertilizing in Paddy & Other
Waterlogged Soils
– Paddy rice – production on water covered
soils
Water 2-6” deep
One of very few crops that tolerate anaerobic
conditions
– Difficult to fertilize due to high nutrient
loss risks
67. Fertilizer Efficiency
Great focus on increasing efficiency of
fertilizer use
Research
Real-time sensors in soils that immediately
detect nutrient deficiency
Transgenic plants
Fertilizer Efficiency – fraction/percentage
of added fertilizer that is actually used
by the plant
68. Fertilizer Efficiency
Typical fertilizer efficiencies:
– 30-70% for N
– 5-30% for P
– 50-80% for K
Maximum profits rarely at maximum yields
– Last amounts of fertilizer to produce more yield
cost more than yield increase
– Management also key
Use of BMP’s increasing
– Encourage environmental protection
– Couple w/ agronomic success
– Increase economic yields, leading to sustainable ag
69. Fertilizer Efficiency
Plant Root Systems
– Some plants better scavengers than
others
– Absorption greatly affected by fertilizer
distribution
– Smaller root system = shorter growing
season = >dependence on fertilizer
– Growth rates & size also effect amount of
nutrients demanded
70. Fertilizer Efficiency
Weeds
– Response to fertilizer much like crops
– N fertilization may increase weed growth
> crop growth
– Application method can also affect weed
growth
Ex – broadcast fertilizer can tend to help
weeds get good start
71. Fertilizer Efficiency
Fertilizer-Water Interactions
– Availability of nutrients directed impacted
by soil water content
– Drip fertigation may be most efficient use
of water & fertilizer
Common in greenhouses
Can be effective in field use
– Israeli farming uses drip irrigation
72. Fertilizer Efficiency
Fertilizing for High Efficiency
– Guides to optimal fertilization:
Avoid large additions of N or K (50#/ac +) on
sandy soils – use split application
Avoid broadcast applications of urea &
ammonia on warm/moist soils – volatilizes
easily – incorporate
Avoid N losses on poorly drained soils by
using ammonium
Band P
Use starter fertilizer
73. Fertilizer Efficiency
Keep N & K fertilizers out of seedling zone to
avoid burn
Reduce leaching by avoiding application
before rain or irrigation
Foliar apply, if feasible/appropriate
Know nutrient demands of crop
Improve management
Remember law of minimum
Soil test
74. Livestock Manure as
Fertilizer
Many benefits of using manure:
Recycles nutrients
Potential to reduce pollution
Adds C to soil
Improve aggregation, infiltration, microbial
vigor
Risks:
Increased weed pressure
High cost of obtaining/applying if you don’t
own it
75. Livestock Manure as
Fertilizer
Not as convenient as commercial fertilizer
Pollution anxiety
Nutrient Production & Recovery
– Production rates predictable &
measurable
– Ration has heavy influence on nutrients in
manure
76. Livestock Manure as
Fertilizer
Manure & Nutrient Budgets
– Generous applications of manure no
longer norm
Some states require & enforce strict manure
management guidelines
– Restricted application due to soil P levels
instead of N
– Manure still can’t meet plant needs alone
Crops remove much higher levels of
nutrients/ac
77. Livestock Manure as
Fertilizer
Using Manure
– Most recognize advantages of using
manure
– Manure production unevenly distributed
in farmland
– Expensive to transport very far
– Too abundant in areas, not enough land
for application
78. Livestock Manure as
Fertilizer
– Must balance three factors
Supply crop nutrients
Dispose of waste
Protect environment
– More focus on manure later