SSMG-23 (G. L. Malzer, D. J. Mulla, and T. S. Murrell)

Getting Specific with Site-Specific Nutrient Management

Summary:

Over simplification of site-specific nutrient management can lead to reduced profits and production. Currently, site-specific nutrient management typically involves applying a definite set of recommendations to different areas in a field, based upon a few factors, such as soil test levels and yield goals. However, if these recommendations do not consider other site-specific factors that influence response to nutrient application, substantial opportunities to increase profits and production may be lost. Standard university recommendations for nitrogen (N) and phosphorus (P) were evaluated for profitability potential within a field and compared to actual crop response needs. Site-specific university recommendations produced an average net return of $75/A, while actual crop response suggested that a return of $100/A was possible with the right nutrient management decisions. Yield and crop response at this location were impacted by drainage and compaction. Proper evaluation of these yield-limiting factors and appropriate management changes based on readily available information could make site-specific nutrient management more profitable.

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