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Relationships Between Soybean Yield and Concentrations of Phosphorus and Potassium in Plant Parts¹

Synopsis: A multiple regression analysis showed that over 80% of the variation in soybean yield was accounted for by the variation in the P and K contents of some plant parts. These results were obtained in an experiment on a fine sandy loam in which applications of P and K fertilizers significantly affected grain yield and P and K content of soybean plants.

² Formerly Research Associate, now Soil Scientist, Soil and Water Conservation Division, ARS, USDA, Pee Dee Experiment Station, Florence, South Carolina, and Professors of Soils, respectively.