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1990～ 1 993年在渭北陇东黄土高原布置了晚播回茬麦一膜两用的田间试验 ,分析试验结果得 :晚播回茬小麦覆膜 ,增温保墒效应明显 ,可提高地温 2～ 4℃ ,节水 3 0 mm以上 ,促进了作物早发 ,保证了小麦安全越冬 ,比单作回茬麦增产 53 .0 %。小麦返青揭膜覆于相邻作物带 ,做到一膜两用 ,集水调水效应显著 ,协调了不同作物需水的供需平衡 ,带田总产 82 1 2 .5～ 91 2 5.0 kg/hm2 ,比单作增产 4 5%～ 1 66%。
The field experiments of late-sowing wheat and double-cropping of wheat were carried out in Longdong Loess Plateau of Weibei from 1990 to 1993. The results showed that the effect of warming and preserving wheat was obvious and the soil temperature 2 ~ 4 ℃, saving more than 30 mm, promoting early crop development, ensuring the safety of winter wheat, increasing wheat yield by 53.0% compared with monoculture. Wheat rejuvenation uncover film covering the adjacent crop belt, so that a membrane dual use, water catchment effect is significant, coordinating the demand and supply of different crop water supply balance, the total yield of 82 1 2 .5 ~ 91 2 5.0 kg / hm2, which is 45% ~ 166% more than the single crop yield increase.