关键词: 土壤深松, 半干旱区, 水分利用效率, 大豆, 玉米, 紫花苜蓿, 种子萌发, 生理特性, 渗透势

Abstract: The study shows that subsoiling can break up tillage pan,decrease penetration resistance and soil bulk density,increase subsoil porosity,and results in a deeper water infiltration depth,which is up to 80 cm.After subsoiling,the root length of soybean is increased by 3.6～4.0 cm,its yield and water use efficiency are respectively increased by 27.7～34.5% and 16.1%,and in drought year,maize yield is increased by 7.9%.

Key words: Subsoiling, Semi-arid area, Water use efficiency, Soybean, Maize, Medicago sativa, seed germination, physiological characteristics, osmotic potential