Economics of Non-Uniform Water Infiltration in Irrigated Fields

摘要: In irrigated agriculture, the unevenness with which water infiltrates root zone is determined mainly by spatial variability (non-uniformity) of irrigation application, on one hand, and hydrologic soil properties, other (Warrick Gardner 1983; Dagan Bresler 1988). The yield a given crop, grown during specific season in certain field under management cultivation conditions, also spatially variable as it assumed to be directly dependent infiltration (Stern Warrick Yates 1987; Laufer If non-uniform, there will under-irrigated over-irrigated areas and, assuming concave crop-water response function, total per unit land area smaller compared conditions uniform infiltration. Therefore, uniformity considered desirable production processes. It has been noted that variation well not completely disordered space but can analyzed within frame stochastic modeling, i.e., regarding infiltered resulting random functions coordinates characterized their probability density (pdf) correlation structure, rather than deterministic values.