Вопросы районирования территории по необходимости орошения

Abstract

Moisture conditions required by crops are created with the help of irrigationin the soil. However, there is a number of negative consequences of irrigation. One of them is soil formation conditions changing which can decrease soil fertility. It is necessary to consider soil heterogeneity and stochastic weather conditions, while irrigation substantiation. Therefore, a quantitative irrigationsubstantiation taking into account landscape: macro, meso and micro (precise land reclamation) is required. Irrigation substantiation is based on a comparison of plant requirements for soil moisture and environmental conditions (actual soil moisture). On the base of the above comparison a probability of irrigation necessityisdetermined. Irrigation necessity depends on soil heterogeneity. The purpose of the work is to determine the function, which makes it easier to calculate the probability irrigation necessity depending on the parameters of soil heterogeneity to provide zoning soil taking into account different sizes of agricultural land sites. The function makes it possible to determine the irrigation probabilities depending on the average annual moisture of soil. The function is a linear dependence in the range of wilting moisture of plants up to the full moisture capacity.