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This article in AJ

  1. Vol. 64 No. 6, p. 743-746
    Received: Sept 24, 1971

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Effect of Fertilizer Nitrogen, Phosphorus, and Potassium on Yield and Nutrient Content of Lee Soybeans1

  1. M. S. Bhangoo and
  2. D. J. Albritton2



Further studies on mineral nutrition of soybeans [Glycine max (L.) Merrill] were needed for better understanding of the relationship between the nutrient contents of the grain and leaf tissue in relation to grain yield as influenced by N, P, and K fertilization.

Field experiments with ‘Lee’ soybeans were conducted over a 3-year period on a Calloway silt loam in southeast Arkansas to obtain data on the effects of various rates and combinations of N, P, and K (112 kg N/ha, 40 kg P/ha, and 75 kg K/ha) fertilizers on grain yield and on the elemental content of leaf tissue and the grain.

Marked yield increases were obtained from N and K fertilizers and from various NPK combinations. Yield increases from N ranged from 10 to 15%, and from K, from 9 to 19%. Yield increases in 1967, 1968, and 1969 from NPK over the check were 32.8, 28.3, and 14.7%, respectively.

Fertilizer application increased the N and K content of both the leaves and grain and depressed their Ca and Mg content. Soybean yield showed a positive correlation with the N and K and negative correlation with the Ca and Mg content of grain and leaf tissue. Elemental content of the leaf tissue declined with plant age.

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