The water harvesting area is a ridge mulched with plastic film and even small rain can easily run down planting area,so soil moisture in planting area can be improved greatly.

• 本试验所采取的措施使施肥量和水分同时得以改善，而不同降雨年型增产幅度差异较大，这表明该地区水分是影响作物产量的主要因素。