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This article in CS

  1. Vol. 9 No. 2, p. 130-134
    Received: Jan 29, 1968



Growth and Yield of Soybean Lines in Relation to Phosphorus Toxicity and Phosphorus, Potassium, and Calcium Requirements1

  1. C. J. de Mooy and
  2. John Pesek2



High rates of P in pot experiments with three nutrient variables, P, K, and Ca, at 5 levels in a twice-replicated 2(2n)+2n+1 composite design resulted in combination of growth responses and P-toxicity effects, threshold leaf contents for which are given. Significant growth and differential responses among soybean [Glycine max (L.) Merrill] lines culminated in large yield responses with maxima at 450 to 500 kg P/ha. Differential growth effects developing in favor of a certain line may change between the 7-leafed stage and the end of flowering in favor of another line. Treatments leading to maximum growth at the 7-leafed stage contained too much P to proceed to maximmn growth and yield at later stages.

Further screening of soybean lines should be directed at maximum nodulation or growth responses and minimum P-toxicity hazard.

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