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This article in SSSAJ

  1. Vol. 49 No. 4, p. 901-904
    Received: Oct 29, 1984
    Accepted: Mar 8, 1985

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Predicting the Most Efficient Phosphorus Placement for Soybeans1

  1. C. M. Borkert and
  2. S. A. Barber2



The effect of placement of P fertilizer on P uptake and plant growth has been predicted for corn (Zea mays L.) but not soybeans [Glycine max (L.) Merr.]. The objective of this paper is to predict the effect of P placement on soybeans and compare it with predictions made earlier for corn. Data for operation of the model were obtained from a pot experiment reported in an earlier paper. Calculations were for soybeans, cv. Century, growing on Raub soil (fine silty, mixed, mesic, Aquic Argiudolls). Calculations were made for P rates of 30, 60, 120, 240, and 480 mg kg−1 each with fractional volumes of soil fertilized ranging from 1.0 to 0.01. Predicted P uptake was converted to predicted plant weight using an experimental relation between P uptake and plant weight. The placement giving the greatest predicted P uptake interacted with P rate. At each P rate as P was mixed with an increasing volume of soil, predicted P uptake reached a maximum and decreased. The greatest predicted P uptake occurred when P was placed in 0.04 of the soil volume when the P rate was 30 mg kg−1, 0.10 when the rate was 60 mg kg−1, 0.20 when the rate was 120 mg kg−1, and 1.0 when the rate was 240 mg kg−1. The results were comparable to those obtained with corn.

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