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

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.

Key Words: Mineral nutrition • Nodulation • Critical nutrient percentages

² Assistant Professor and Head of Department, respectively.

Received for publication January 29, 1968.