实行小定额灌溉的原则,是要求供水率小于土壤的吸水率,使每滴水都进入土壤中,避免产生径流,从而充分发挥灌溉水的效益。同时,使土壤内的空气和水都处于最佳状态,有利于根系生长并减轻病害。 从经济角度而言,使用小定额灌水装置灌溉,既省水、省劳力,如增加注肥装置,还能把肥料直接送到根系层,节省施肥量。 The principle of small fixed irrigation is to require the water supply rate is less than the water absorption of the soil, so that each drop into the soil, to avoid runoff, so as to give full play to the benefits of irrigation water. At the same time, make the air and water in the soil are in the best state, is conducive to root growth and reduce disease. From an economic point of view, the use of small fixed irrigation device irrigation, water conservation, labor-saving, such as increasing the injection device, but also to the root layer of fertilizer directly to save fertilizer.