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

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1994-12-01
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Mallarino, Antonio
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Proceedings of the Integrated Crop Management Conference
Iowa State University Conferences and Symposia

The Iowa State University Integrated Crop Management Conference is Iowa's premier crop production education event. No other program in Iowa brings together the diverse range of topics, slate of expert presenters and results of the latest University research.

The ICM Conference offers workshops focusing on the latest in crop production technology. Experts from Iowa and surrounding states will provide research updates and results in soil fertility, soil and water management, crop production and pest management.

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Abstract

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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