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滴灌有助于获得单位灌水量的最高农作物产量,以满足世界日益增长的人口对粮食和衣着的需求。滴灌是通过管网把灌溉水滴入植物的根际。其所以能提高作物的产量,是由于频频的灌水而使土壤保持低的水分张力。一些科技工作者已研究出采用滴灌时棉花的需水量,并把它与常规沟灌和喷灌相比较,以确定滴灌省水效果和作物产量。Petrasovie(1971)发现,棉花在不同生育阶段,日需水量等于田间蒸发量的0.45～0.8。Levin 等人(1979),用滴灌法种植棉花发现,在厚层土壤中,第一次灌水最适宜时间是当土壤水分消耗到50%
Drip irrigation helps produce the highest yields of crops per unit of water needed to meet the world’s growing food and clothing needs. Drip irrigation is the irrigation water dripping into the plant’s rhizosphere through the pipe network. Therefore, it can increase the yield of crops due to frequent irrigation and keep the soil low moisture tension. Some scientists have studied the demand of cotton for drip irrigation and compared it to conventional furrow irrigation and sprinkler irrigation to determine the effect of drip irrigation on water saving and crop yield. Petrasovie (1971) found that the daily water demand of cotton at different stages of growth equals 0.45-0.8 of the field evaporation. Levin et al. (1979), using cotton drip irrigation method found that in thick soil, the first irrigation the most appropriate time is when the soil moisture consumption to 50%