农田灌溉的发展趋势、规模、速度以及应该采取的对策，是我国今后灌溉发展的重要问题。确定作物对水分需要的规模及有效控制面积的因素是灌溉用水量。旱作物在土壤肥力等相同条件下，缺水时，作物产量随灌水量的增加而增加，而当土壤水分达到他和后，就会因土壤中缺氧成渍害而 The development trend, scale and speed of farmland irrigation and the countermeasures that should be taken are the important issues for the future development of irrigation in our country. The factor that determines the size of a crop’s need for water and the area under effective control is the amount of water used for irrigation. Dry crop Under the same conditions of soil fertility and the like, in the case of lack of water, the crop yield increases with the increase of the irrigation amount, and when the soil moisture reaches him and after, it will be endangered by the lack of oxygen in the soil