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Know Your Soil Test Results Before You Cut Back on or Add Fertilizer Phosphorus
Producers planning to cut back on phosphorus (P) should first determine the availability of P in their soil. Soil testing research data from the North Dakota State University soil testing laboratory shows that if a soil test for P over 10 ppm, normal rates of P could be one area to reduce. However, in cool wet soils, lack of starter P fertilizer may reduce early season growth compared to when fertilizer is used. If a soil test is in the medium range, from 5-10 ppm, and no P is applied, yield losses may result. If a soil test is low for phosphorus, 5 ppm or below, a yield reduction is highly probable.
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