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This article in CS

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

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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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