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1 试验条件及设计试验设在西吉县西南的城郊乡马营村阳山坡地上,海拔2100m,属于黄土丘陵半干旱区,年均降水427.9mm,年干燥度1.26~1.55,年平均气温5.3℃,>10℃的活动积温1823.7℃,无霜期111天左右,年日照时数2322.2小时.试验田土壤为浅黑垆土,前作小麦,耕层0~20cm.土壤含有机质1.5%、水解氮56.1mg/kg、P_2O_58.4mg/kg、速效钾138mg/kg,pH
1 Test conditions and design tests are located in the Yangsan slope of Maying Village, Chengjiao Township, southwest of Xiji County, at an altitude of 2,100 m, belonging to the semi-arid region of Loess Hilly with an average annual rainfall of 427.9 mm and an annual dryness of 1.26 to 1.55 with an annual average temperature of 5.3 ° C , Activity temperature of> 10 ℃ was 1823.7 ℃, frost-free period was about 111 days, and annual sunshine duration was 2322.2 hours.The soil of the experimental field was light black alluvial soil, before wheat, 0-20 cm soil layer, 1.5% soil organic matter, 56.1 mg / kg, P 2 O 58.4 mg / kg, available potassium 138 mg / kg, pH