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Modeling Long‐Term Crop Response to Fertilizer Phosphorus. I. The Model 1
Author(s) -
Wolf J.,
Wit C. T.,
Janssen B. H.,
Lathwell D. J.
Publication year - 1987
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1987.00021962007900030008x
Subject(s) - fertilizer , term (time) , phosphorus , crop , agronomy , environmental science , mathematics , field experiment , agricultural engineering , soil science , statistics , chemistry , physics , biology , engineering , organic chemistry , quantum mechanics
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.