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1 试验材料与方法试验地设在锦河农场试验站。土壤为沙质棕壤,前茬为小麦,秋翻秋耙。施肥纯量67.5kg/hm2,氮磷比例2:1。人工开沟施肥播种,播深2.0～2.5cm,行距15cm,保苗数1000株/m2。生育期间人工除草1遍。试验设4个播期,不同播期间隔10d。播期:处理1为5月5日,处理2为5月15日,
A test materials and methods Experimental ground located in Jinhe farm pilot station. The soil is sandy brown soil, the former crop is wheat and the autumn is autumn rake. Pure fertilizers 67.5kg / hm2, nitrogen and phosphorus ratio of 2: 1. Artificial ditching fertilization sowing, sowing depth of 2.0 ~ 2.5cm, spacing 15cm, seedling number 1000 / m2. Artificial weeding during birth 1 times. Test set 4 sowing date, different sowing interval 10d. Sowing date: Processing 1 is May 5, Processing 2 is May 15,