为了解秸秆不同覆盖量对旱地微垄沟播春小麦产量形成的调控效应，以常规小麦秸秆覆盖量10 500 kg/hm2为对照，在会宁县旱川地研究了不同秸秆覆盖量对旱地微垄沟播春小麦的生长发育特性及其产量变化。结果表明，微垄上覆盖粉碎小麦秸秆量为3 000 kg/hm2时有利于提高小麦苗期0～20 cm土层土壤温度。小麦生育进程随秸秆覆盖量的增加而逐渐缩短，微垄上覆盖粉碎小麦秸秆量为3 000 kg/hm2时，处理小麦生育期较对照延迟5 d；保苗数和成穗数分别较其他处理显著增加30.90%～35.47%和13.49%～18.18%；籽粒折合产量最高，为3 900.0 kg/hm2，较对照显著增产，增产率为9.22%。是会宁县旱川地微垄沟播春小麦比较适宜的秸秆覆盖量。

In order to explore the regulatory effect of different straw mulches amount on the yield of spring wheat planted in micro ridge furrow in dry land， the field experiments were carried out. We studied the growth and development characteristics and grain yield change of spring wheat planted in micro ridge furrow in dry land by using conventional straw mulches as the control. The results showed that the wheat straw mulched with 3 000 kg/hm2 was beneficial to increase the soil temperature in the soil layer between 0 and 20 cm in the wheat seedling stage. The growth process of wheat was gradually shortened with the increase of straw mulch amount. The growth period of wheat under the treatment of straw covered with 3 000 kg/hm2 was 5 d later than that under the control. The seedling number per unit area and panicle number were 30.90%~35.47% and 13.49%~18.18% higher than other treatments. The highest grain yield was highest(3 900.0 kg/hm2)， 9.22% higher than that of the control. It was suitable straw mulch for spring wheat sowing in micro furrows in Huining County.

S512.1

甘肃省科技重大专项计划项目(1203NKDF018)；甘肃省农业科技创新项目(GNCX-PZXY-2010-1)；甘肃省高等学校科学研究成果转化培育项目(2017D-12)。