摘要： 据1992~1993年大田试验结果，分析了不同时期麦秸覆盖对夏玉米生长发育和产量的影响。结果表明，麦秸覆盖后对夏玉米的产量有一定的影响，在1992年的降雨年型下，麦秸覆盖对夏玉米的产量有提高作用，在1993年的降雨条件下，麦秸覆盖数量在不超过9.0t/hm²时对夏玉米的产量有提高作用，超过时则出现夏玉米产量降低。从大田试验中采集的麦秸样品的水提液发芽试验中得出，麦秸中水溶性毒素物质随着降雨淋入土壤，其毒性可持续3个月之久。

关键词: 生化他感, 麦秸覆盖, 玉米, 产量

Abstract: Wheat straw mulching effects the yield of corn. The yield of corn mulched with wheat straw increased in 1992, when it was a rainy year. In 1993, when the mulching straw weighed less than 9. 0 tons/ha the yield of corn also increased, while corn yield decreased when the mulching straw weighed over 9. 0 tons/ha.A germinative test was carried out with water extract of wheat straw samples collected from the field, which indicated that the water-soluble toxic substances in wheat straw could get into the soil as washed by rain, and its toxity could last more than 3 months.

Key words: Biochemical allelopathy, Wheat straw mulching, Corn, Yield

中图分类号: 

• S513.01