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This article in AJ

  1. Vol. 79 No. 3, p. 445-451
    Received: May 5, 1986



Modeling Long-Term Crop Response to Fertilizer Phosphorus. I. The Model1

  1. J. Wolf,
  2. C. T. de Wit,
  3. B. H. Janssen and
  4. D. J. Lathwell2



Prediction of long-term crop response to fertilizer P should result in more efficient use of this resource. To achieve this, a simple model designed to calculate the long-term recovery of fertilizer P was developed and is presented here. In the model, both a labile and a stable P pool are distinguished. With time intervals of 1 yr, the model calculates the P transfers between the pools, the uptake of P by the crop, and the resulting pool sizes. Most input data required to operate the model can be obtained from ordinary one-season fertilizer P trials. Input data, model parameters, and initial pools can be derived from field trials, and the model can be used to calculate long-term recovery of fertilizer P. The sensitivity of the model is demonstrated by changing parameter values. The model can also be used to establish long-term fertilizer recommendations for a certain target P uptake. Required rates of fertilizer P are calculated for different soils, fertilizer types, target uptakes, and periods of time.

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