Start Date

1-12-1994 12:00 AM

Description

Soil testing is a useful tool to evaluate soil fertility, and fertilization recommendations for phosphorus (P) and potassium (K) usually are based on soil testing. There are many potential errors involved, however. One of the most important sources of error is obtaining a representative sample in the field. A very small amount of soil needs to appropriately represent thousands of tons of soil, and usually there is significant spatial variability of nutrient levels. This is the basis for the development of technology to spatially vary the rate of fertilizer application within a field. Conventional soil sampling methods, however, are not suitable for this type of technology because usually only one composite sample is collected for an entire field or for major soil types within a field.

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Dec 1st, 12:00 AM

Spatial Variability of Phosphorus and Potassium in No-Till Corn and Soybean Fields

Soil testing is a useful tool to evaluate soil fertility, and fertilization recommendations for phosphorus (P) and potassium (K) usually are based on soil testing. There are many potential errors involved, however. One of the most important sources of error is obtaining a representative sample in the field. A very small amount of soil needs to appropriately represent thousands of tons of soil, and usually there is significant spatial variability of nutrient levels. This is the basis for the development of technology to spatially vary the rate of fertilizer application within a field. Conventional soil sampling methods, however, are not suitable for this type of technology because usually only one composite sample is collected for an entire field or for major soil types within a field.