水稻,顾名思义是需水较多的作物。但也不能长期深水灌溉,正如农谚所说:“稻在水边生,无需深水长”。水稻的生长发育特性告诉人们,其生育期间最需要控水调气,采取间歇灌溉,经常露田的办法,做到土壤中既湿润不缺水,又通气不缺氧,合理解决水和气的矛盾,力求从地上地下两头促使水稻根深、秆壮、穗大、粒重。要求前期露田通气,以气促发根,发根利分蘖;中期晒田通气,以气扎深根,根深促壮秆;后期干湿通气,以气养老根,以根保大粒。如果稻田长期淹灌,土壤通气不良,会使好气性微生物难以活动和繁殖,土壤不能新陈代 Rice, as the name suggests, is a crop that requires more water. But it also can not be used for long-term deep-water irrigation. As the old saying goes: “Paddy is born at the water’s edge, it does not need deep water.” The growth and development characteristics of rice tell people that it is most necessary to control water and gas during its growing period and take intermittent irrigation and often open fields to make the soil not only humid but not water deficient, , And strive to make rice from the ground two underground deep, stout, spike, grain weight. Requires pre-open ventilation, to promote hair root, hair root Lee tillering; mid-field Shatian ventilation to root deep rooted, root deep and strong stalks; late wet and dry ventilation to gas Yanglaogen to root security tablets. If paddy fields are drowned for a long time, poor soil aeration will make it difficult for aerobic microorganisms to move and reproduce, so that the soil can not be replaced