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  1. Agricultural IPM
  2. Field Crops
  3. Cotton
  4. Soil Management
Cotton Soil Management
Nutrient Budget Calculator

The Nutrient Budget Tool is a resource for growers who are interested in adequately providing the correct amount of nutrients for their crops for the optimal yields. This tool allows growers to choose crop type and yield goals into a spreadsheet that will then output the needed fertilizer levels of N, P, K needed to meet projected yield goals. Soil test, irrigation water test, and manure nutrient test analysis results can also be input to calculate the overall results of a crop’s nutrient/fertilizer needs. This tool is designed to help promote soil testing and analysis and to help growers be more cost and nutrient efficient. We plan to expand the Nutrient Budget Tool in the future to incorporate soil salinity levels (EC) and pH to better service the nutrient budget users and provide greater information.

 

Download:

Nutrient Budget Tool

 

1. Choose the crop from the list of tabs at the bottom of the screen.


2. Fill in the “Plan Area” field in acres and “Yield Area” field in lbs/acre or tons/acre. Doing this will provide the needed N, P, and K requirements of the specified plan area.

3. Additional numbers from irrigation water analysis, soil analysis and fertilizer analysis from a plan area can be input to factor in to the overall needed requirements for N, P, and K in lbs/plan area.

 

 


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Physical Conditions
The main thing one would be looking for in a field evaluation would be the physical condition of the soil through the profile (vertical depth). Problem areas may show evidence of a clay layer, a hardpan (perhaps natural or a plowpan), abrupt changes in soil texture from one horizon to another, a gravel layer, or even a water table. All of these factors can vary tremendously within a given field and can affect crop growth and productivity. Physical conditions in the soil, for the most part, are not easily altered (i.e. changing soil texture or horizon organization), but they can impact the way in which we manage these areas in terms of tillage, cultivation, and/or irrigation practices. The presence of a hardpan or plowpan can be dealt with to some extent by the use of deep tillage (i.e. ripping). High water tables may require the use of some drainage techniques. The depth at which gravel, compaction, or free water layers occur can 2 The University of Arizona Cooperative Extension indicate to us the general depth to which roots will grow. For example, if a coarse gravel or compacted layer were detected about 18 inches below the surface, this would be a good indication that our effective rooting zone would be limited to this depth as well. So instead of having a full soil profile of four feet available for rooting (water holding capacity and nutrient availability), we would only be working with about 18 inches. The bottom line in this respect is “if you don’t know what your soils look like below the surface, it may be worthwhile to go find out”. This could be useful in addressing some of the problems common to fields or parts of fields.

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Chemical Conditions

The other aspect of soil evaluation that is important is that of the chemical condition. Soils are very active chemically and they can differ a great deal in terms of chemical conditions present. The soil chemical environment is very important in that it determines the composition of the soil solution within which the roots live and function, which directly impacts plant nutrition. Physiologically, plant nutrition is clearly recognized as a fundamental aspect of a healthy, vigorous, and productive cotton plant. Accordingly, soil testing has become an integral part of modern agriculture and certainly for cotton production. In developing an assessment of soil chemical conditions or a soil fertility evaluation, it is probably worthwhile to review some basic aspects of making a soil fertility program functional and profitable. This would be true if we were dealing only with problem areas or entire fields.

 

As an example, soil pH conditions alone (the degree of acidity or basicity that is present) can have a strong impact on nutrient availability, root growth, and over- all plant health. In some portions of the cotton belt (particularly in the Southeast), acid subsoils can reduce or prevent root growth, which can limit the depth of the soil profile utilized by the plant and have a similar end result as the gravel layer. This condition may not be detected by augering through the soil and visually inspecting it, but it would be readily apparent if soil samples were collected at regular depth intervals and subjected to a simple pH analysis.


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Soil Management Publications
  • Jun 2015
    Soil Management and Soil Testing for Irrigated Cotton Production
    Publication (PDF, 436KB)
    Authors: J. C. Silvertooth
    Whenever studying cotton, it is a natural tendency to focus on the above ground portions of the plant. However, an equally important part of the plant is the root system, The soil is a focal point of any farming operation.
  • Jun 2015
    Soil Fertility and Soil Testing Guideline for Arizona Cotton
    Publication (PDF, 293KB)
    Authors: J. C. Silvertooth
    According to all available evidence, there are 20 total nutrients necessary for complete plant growth and development. Not all are required for all plants, but all have been found to be essential to some.
  • Feb 2014
    Diagnosing Nutrient Deficiencies Quick-Reference
    Publication (PDF, 429KB)
    Authors: Shawna Loper
    Nutrient deficiencies can be identified in field through visual observations. However, additional analysis, either plant or soil testing is often necessary to confirm nutrient stress. The following is a quick-reference flow chart that can be used in field to identify potential nutrient deficiencies. Each nutrient has unique deficiency symptoms. Deficiencies will appear in many ways. It can be confused with other plant problems like pathogens or spray damage. But nutrient deficiencies can often be recognized because they tend to form symmetrical patterns, where both sides of leaf or plant parts show the same pattern.
  • May 1991
    Nitrogen Management Guide for Cotton
    Publication (PDF, 493KB)
    Authors: Thomas A. Doerge, Robert L. Roth, Bryant R. Gardner
    Nitrogen is the nutrient that is required most often and in larger amounts than other nutrients for cotton production.

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Soil Management Presentations
  • Feb 2013
    Pre-season and Early Season Cotton Management
    Presentation (PDF, 1.56MB)
    Authors: Guangyao (Sam) Wang
    Location Presented: Avondale, AZ

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