A STUDY OF THE PRODUCTIVE ABILITY OF SOIL MOISTURE RESOURCE AND ITS UTILIZATION
土壤水分资源生产能力及其利用研究

The crop productive ability of soil moisture is studied by using the artificial moisture control under the climate in Shanxi Guanzhong.The results show that the highest soil moisture productive ability for wheat is 17.59kg/hm2.mm),for millet 11.61kg/(hm2.mm),for pea 10.33kg/(hm2.mm),and for rape 10.46kg/(hm2.mm).The critical value of soil moisture storage to obtain a certain output of wheat is about 160mm,of pea 150mm of millet and of rape 300mm.After the storage of soil moisture is over the critical value crop yield can be greatly improved with an increase of storage of soil moisture.But when soil moisture exeeeds a certain amount,crop yield tends to be stable.For example,for pea when soil moisture exceeds 300mm,for wheat 400mm,for millet 500mm,and for rape 650mm.Soil moisture productive ability can not raised when moisture is insufficient and fertilizer is abundant or when moisture is abundant and fertilizer is insufficient.At this time,the soil moisture ineffectively consumed.The soil moisture productive ability can be improved by applying fertilizer according to moisture conditions.