23-A hydrological aspect on crop.

Abstract

A mathematical model based on the equation of continuity for soil-moisture variation under different actual precipitation occurrence has been developed using the physical possible relationship between the crop-water requirement and the available soil moisture condition. This hydrological model provides the direct determination of soil moisture as a function of time and corresponding water requirement by a specified crop during a particular phases of the crop via the soil water storage relation. The crop water requirement is a function of crop-phase, type and density, soil-moisture storage at root-depth, soil-nature, radiation energy, vapour-pressure difference and temperatures constrast. A mathematical model has been put forward here for obtaining the soil moisture storage explicitely as a function of the intensity and distribution of the type of rainfall. Special simple cases have been derived for this generalised analysis for showing the correctness of the procedure followed in this investigation.