一、种稻为什么能够改良利用盐碱地1.种植水稻后,一般田面经常保持水层,土壤含水量处于饱和状态,在相同的土壤含盐情况下,水田中盐分的浓度(即单位体积土壤溶液中的含盐量)较旱田低,因此种稻所允许的土壤最大含盐量就较一般旱作为高,例如青铜峡灌区水稻生长正常时土壤允许最大含盐量为0.27—0.54%(0—20厘米土体中平均含盐量),小麦则为0.26—0.31%,高粱为0.20—0.35%, First, the reason why rice can improve the use of saline and alkali land 1. Rice cultivation, the general field of water often maintain the water layer, the soil moisture is saturated, the same in the case of salt, paddy field salt concentration (ie, unit volume of soil solution Of salt content) is lower than the dry field, so the maximum allowable soil salt content of paddy rice is higher than that of normal drought. For example, the maximum allowable salt content of soil in the growth of rice in Qingtongxia irrigation area is 0.27-0.54% (0-20 Cm soil average salt content), wheat was 0.26-0.31%, sorghum 0.20-0.35%,