My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in AJ

  1. Vol. 79 No. 3, p. 445-451
     
    Received: May 5, 1986
    Published: May, 1987


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/agronj1987.00021962007900030008x

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

Abstract

Abstract

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.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .