Abstract
According to concepts and techniques developed by Bray, ten extracting procedures for soil phosphorus were compared and evaluated against phosphorus response collected from field potato trials conducted in various potato-growing areas of Southern Ontario over three years.A modification of the PA2 test, developed by Bray and his associates for the extraction of adsorbed + acid-soluble phosphorus, was chosen as most nearly fulfilling the requirements of a successful soil test under the conditions of this experiment.The soil test was calibrated against response to phosphorus fertilizer rates resulting in a phosphorus requirement table for potatoes.
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