干旱区生态环境知识资源中心

In order to study the feasibility about using rainwater to irrigate the corn silage in the pastoral areas of north China, runoff ground were disposed in two different slopes (the gradient were 5 and 12 respectively) with film mulching on the upper slopes to harvest rainwater into the downslope soils (in which the corn silage were planted), which could hopefully be able to increase the rainwater use efficiency. The study indicated that the rainwater harvesting efficiencies were 82.5% and 87.3% on the two slopes, which showed the rainwater harvesting efficiency on the 12 slope was higher than that on the 5 slope. The corn silage yields were 18.6 and 6.3 t/hm(2) and the rainwater utilization efficiencies were 126.41 and 44.23 kg/hm(2).mm on 12 and 5 slopes respectively, which were lower than the statistical data obtained under full irrigation conditions in this region. This experiment study tried to explore the effective ways to using rainwater to irrigate in the arid region, however, further study were stilled needed to prove it a practical methods.