Summary:
1. Findings from this study are applicable to fields with phosphorus (P) frequency distributions similar to that shown in Figure 1. In fields with high soil test P variability, precision management of P produced the greatest level of profitability when the composite soil test P level was in the high to very high soil test P categories.
2. Average soil P test level and prior field histories can be used as a decision aid to reduce economic risks associated with adopting precision farming techniques.
3. Appropriate P response models and yield goals must be used to accurately assess potential profitability associated with precision P management.
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