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以冬小麦收获后高留茬休闲地为对照,连续4年在陇东黄土旱塬设6个油菜播种期,研究了休闲期作物覆盖对土壤水分及后作冬小麦产量与水分利用效率的影响.结果表明:不同播种期夏休闲期土壤贮水量差异显著(P<0.05),其中8月5日播种油菜的土壤蓄水效率为58.5%,产量和水分利用效率较对照提高7.5%和5.9%.平均而言,夏休闲期复种油菜后作小麦干旱年份增产16.1%,平水年份增产6.8%.夏休闲期复种油菜是西北旱地小麦抗旱增产的有益途径.
Taking the high-stubble fallow after harvest as a control, six rapeseed seeding periods were set up in Longdong loess plateau for four consecutive years, and the effects of crop cover on soil moisture and following winter wheat yield and water use efficiency were studied.Results The results showed that there was significant difference (P <0.05) in soil water storage during different seeding periods and summer seasons, in which the soil water storage efficiency of seeding rapeseed was 58.5% on August 5, and the yield and water use efficiency increased 7.5% and 5.9% In terms of summer rapeseed rapeseed crop yield increased by 16.1% in wheat years and 6.8% in flat water year in summer. Multiple cropping of rapeseed during summer leisure time is a beneficial way to increase drought-resistant wheat yield in dry land of northwestern China.