Oklahoma State University

General Information

General Information

Phosphorus is a immoble nutrient. This being so the need is not related to yield to rather related to concentation in the soil. When a soil test is returned the analysis whether reported in ppm, STP, or lbs per ac is related to the sufficiency of P in the soil.

As a note STP as reported by OSU SWFAL is essentially lbs/ac. PPM *2 equals lbs/ac of a 6" soil sample.

Phosphorus Sufficiency table

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