WU Shu-na;YANG Shu-qing;LI Wen-juan;YANG Shui-yuan;SUN Yun-ling;College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University;Inner Mongolia Hengyuan Water Conservancy Engineering Ltd. Co;

tillage and cover measures;;the Southern Foot of Daxing'an Mountains district;;dry-farmed soybean;;soil water and heat effect;;yield

In order to explore the impacts of different tillage and cover measures on soil water and heat environment and soybean yield under dry-farmed conditions,four treatments of traditional tillage( T),no-tillage( NT),traditional tillage with straw mulching( TS),and traditional tillage and plastic mulching( TP) were set to carried out experimental study. The results show that: during the whole growth period,compared with T treatment,TP treatment has the effect of increasing soil temperature,while NT and TS treatment show different degrees of soil cooling effect,and NT treatment has no significant effect on soil moisture conservation; TP treatment can increase temperature and retain moisture in the early stage and decrease temperature and inhibit evaporation in the later stage,which is conducive to improving soil hydrothermal environment and meeting the environmental requirements of soybean growth and development; under different measures,the order of soybean yield from high to low was TP>TS>NT>T; the yield of TP,TS and NT treatment is 249.9,548.85 and 760.5 kg/hm2 higher than that of T treatment,respectively; TP treatment has the highest yield increase,and the yield increase rate of each treatment rangs from9.02% to 27.45%; the correlation between soil temperature and yield is shown as TP > TS > NT > T,and there is a significant correlation between soil temperature and yield under TP treatment,indicating that soil temperature will have an impact on yield,and TP treatment has the largest impact.