材料与方法试验地选在宁夏盐池草原实验站,地形为缓坡丘陵,海拔1500米。灰钙土壤。植物生长季节内(四至九月)的几个气象要素见表1。供试沙打旺为一九七四年从江苏引进,一九七八年采收种子,一九七九年播种。栽培密度为0.86株/米~2。四月初返青。生长季节内除雨后适时中耕除草外,无其它管理措施。 Materials and Methods The experiment was selected at the Yanchi Grassland Experimental Station in Ningxia. The terrain is gently sloping hills with an elevation of 1,500 meters. Gray calcium soil. Several meteorological elements within the plant growth season (April to September) are shown in Table 1. The test sand was introduced from Jiangsu in 1974, seeds were collected in 1978 and sown in 1979. Cultivation density of 0.86 plants / m ~ 2. Early April return green. There is no other management measures except for timely cultivation of weeds in the growing season.