全膜双垄沟播玉米不同覆膜时期水分生产效率研究

为了进一步探索全膜玉米不同时期覆膜对水分生产效率的影响，笔者选择四种不同覆膜时期，在玉米关键生育期测定0-100cm土层含水量，研究生育期耗水、生育期降水、年降水的生产效率。结果表明：冬季土壤封冻到春季土壤解冻采取秋覆膜可减少27.6%的土壤水分损耗；土壤解冻到玉米播种采取顶凌覆膜的可减少16.0%的土壤水分损耗。全膜秋覆膜较顶凌覆膜生产能力提高9.27%、生育期降雨生产效率提高0.16 kg/mm，顶凌覆膜较播前覆膜生产能力提高7.44%、生育期降雨生产效率提高0.13 kg/mm。

Study on the Different Water Productivity of Maize Treated with Film Mulching Two Lines during Different Growth Period

In order to further explore the effect of whole film at different stages on maize production efficiency to water, four different ways during the film were chosen to test 0-100cm soil water content during the key growth period of maize researched the productivity of growth period water consumption, growth period of precipitation and annual precipitation. The results show that , 27.6% of soil moisture loss was reduced by plastic film mulching from the period of freeze-up in Winter to defrosting in Spring, and 16.0% by film mulching from if mulched film in Spring just before the thawing time and soil thawing to sowing the maize. Compared with plastic membrane covered on the just thawing soil, the water productivity of maize can increased by 9.27% by mulching soil with whole film in autumn. Production capacity is increased by 0.16kg yield per millimeter precipitation during the growing season. But Compared with mulched film just before the seedtime, mulched before the thawing raise 7.44% of productivity, and raise 0.13kg yield per millimeter precipitation during the growing season.