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This article in AJ

  1. Vol. 65 No. 6, p. 851-855
     
    Received: Oct 24, 1972
    Published: Nov, 1973


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doi:10.2134/agronj1973.00021962006500060001x

Comparative Response of Soybeans and Corn to Phosphorus and Potassium1

  1. C. J. deMooy,
  2. J. L. Young and
  3. J. D. Kaap2

Abstract

Abstract

Much interest has developed concerning the comparative responses of soybeans [Glycine max (L.) Merr.] and corn (Zea mays L.) to fertilization. Grain yields of soybeans and corn grown side by side and in response to direct and residual P and K fertilizer applications were compared on an energy basis over 4 years of field experimentation. Corn was significantly more responsive than soybeans to direct and residual fertilizer P and to direct application of K. Limited nutritional requirements of soybeans were indicated by the small response from applied P and K fertilizers on land of low fertility, by the lack of response to more than a maintenance rate of P application, and by the fact that soybeans did not respond appreciably to a second cycle of P and K fertilization although the soil remained low in P and low to medium in K. The corn responded to the second increment of P and to a second cycle of P fertilization. Soybeans showed little difference between the effect of direct and residual fertilizer on yield. Corn responded to K in the year of application, but not to residual fertilizer. Differential response of corn from direct and residual P application was dependent on seasonal conditions. In the corn-soybean cropping sequence on Webster silty clay loam where direct response from fertilizers occurred, P and K applications in alternate years were more effective for corn than for soybeans. The advantage of corn fertilization was relatively insensitive to soybean/corn price ratios.

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