Evaluation of some water extraction models in predicting water uptake of pigeonpea
 
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National Cereals Research Institute, P.M.B.8, Bida, Niger State, Nigeria
 
Int. Agrophys. 1996, 10(2): 109–116
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ABSTRACT
There is the need to have model(s) that best describe water uptake for pigeonpea. Three water extraction models published in the literature and one suggested by this author were examined for two pigeonpea genotypes (1CPL 87 and ICP 1 -6) grown under field conditions on an Alfisol. The accuracy of the models was evaluated by comparing the water extraction rate using the models with the traditional water flow equation in soil including a sink/source term. Prediction of water extraction by the author's model agreed very well with those from the traditional water flow equation in soils (r = 0.999). Gardner and Hillel et al. models performed moderately well in terms of their predictive capabilities. Other factors limiting the predictive capabilities of the models and suggestions for improving them were also discussed.
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