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Increasing fertilizer costs have prompted farmers to ask whether soils could be maintained at lower levels of plant‐available phosphorus (Olsen P) than currently recommended without losing yield. To help answer this question, we assessed the response to Olsen P by spring barley grown from 1986 to 1991, followed by winter wheat from 1992 to 2008, on a silty clay loam soil. Each year the curve relating...
The increasing cost of fertilizer has prompted farmers to ask whether soils could be maintained at lower levels of plant‐available phosphorus (Olsen P) than currently recommended, without limiting yield. To help answer this question, critical levels of Olsen P have been determined for spring barley, winter wheat, potatoes and sugar beet grown on a sandy clay loam and a poorly structured heavy textured...
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