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Synopsis: The rate of depletion of soil phosphorus and potassium when omitted from the fertilizer increased with increasing rates of nitrogen application. Potassium became critical sooner than phosphorus on the Tifton loamy sand. Maintenance fertilizer consisting of a 4-1-2 ratio produced hay yields equal to those resulting from higher amounts of phosphorus and potassium.
2 Assistant Agronomist, employed jointly by Crops Research Division, ARS, USDA, and the University of Georgia, College of Agriculture Coastal Plain Exp. Sta., Tifton; Assistant Soil Scientist; and Soil Scientist, University of Georgia, College of Agriculture Coastal Plain Exp. Sta.; respectively.
Received for publication June 20, 1958.
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