Abstract:Aid-to-irrigation with rainwater catchment is an efficient measure to assure t he stability and high-yield of crop production in the arid or semi-arid region s ,especially on the Loess Plateau of northern China. In recent years, the resea rches relative to the issue focus on the determination of the aid-to-irrigatio n system with rainwater catchment. The present study was conducted in field plot s at the northwest of the Loess Plateau to evaluate the effect of micro-irrigat ion with rainwater catchment on t...