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A von Liebig Model for Water and Nitrogen Crop Response

1987; Volume: 12; Issue: 2 Linguagem: Inglês

10.22004/ag.econ.32239

2327-8285

Sadi S. Grimm, William A. Williams,

Plant Water Relations and Carbon Dynamics

Attempts to develop production functions for irrigated crops have been numerous and can be classified in two main categories depending upon whether or not the timing of input application is explicitly considered in the model formulation. In most empirical studies water production functions have been estimated on the basis of data obtained from field experiments using small plots or lysimeters and follow some specific criterion to determine timing of irrigation applications. Hence, the extrapolation of the results is conditioned on following the same criterion: whenever the soil moisture tension rises to a certain level, sufficient water must be applied to restore soil moisture to field capacity in the entire root zone. In contrast, the scope of this paper is limited to water production functions where timing of irrigation is not explicitly considered in the model. 1 From an economic viewpoint, the significant explanatory variable is applied water