作物腾发规律是制定灌溉制度的基本依据。作物腾发量受土壤水分亏缺的制约,在不同的生长阶段,影响的大小亦不同。作物产量随土壤水分亏缺的增加而减小,其敏感度指数在作物灌桨期达到最大。因此,在灌溉水量不足时,应优先考虑对敏感度指数较大的生长阶段进行供水,以求获得较高产量。 The rule of crop evapotranspiration is the basic basis for formulating irrigation system. The amount of crop evapotranspiration is limited by soil water deficit, and the magnitude of the impact is different at different stages of growth. The crop yield decreases with the increase of soil water deficit, and the sensitivity index reaches the maximum during the crop filling period. Therefore, in the case of insufficient irrigation water, priority should be given to water supply in the growth stage with a high sensitivity index in order to achieve higher yields.