【作者】 杨起简； 路平； 刘玉芬； 李海强；

【Author】 Yang Qijian, Lu Ping, Liu Yufen, Li Haiqiang( Beijing Agricultural College, Beijing 102206, P. R. China)

【机构】 北京农学院；

【摘要】 对7种紫花苜蓿各茬的株高、干草产量、粗蛋白含量和土壤主要养分的变化进行了分析,结果表明:Vector紫花苜蓿全年干草总产量最高,为13 666.2 kg/hm2。第二茬与第一茬和第三茬的干草产量和株高存在显著差异。各苜蓿品种枝条粗蛋白含量最高的是Vector,为15.3%。第一茬和第二茬与第三茬的粗蛋白含量差异明显。苜蓿年内叶片各品种粗蛋白含量最高的为Vector 27.55%,依次是朝阳27.4%和中苜一号为26.3%。第一茬和第二茬与第三茬的粗蛋白含量差异明显。7种苜蓿生长一年后土壤碱解氮含量变化很小,土壤的pH值,有机质,全氮量有不同程度的降低,但差异不显著。更多还原

【Abstract】 The plant height, dry yield, crude protein and the main soil nutrient contents for 7 species of alfalfa were measured. The results showed that the total dry yield of Vector alfalfa for the whole year was 13 666. 2 kg/hm2. There were distinct differences in dry yield and seedling height between the second batch and the first and third batches. The highest crude protein content of the branches was 15. 3% , which belonged to the species of Vector, and the crude protein contents of the branches for the first and the second batches were considerably different from that of the third. The crude protein contents of the leaves for Vector, Zhaoyang, and Zhongmu - 1 was 27.55% , 27. 4% , and 26. 3% respectively, and the crude protein contents of the leaves for the first and the second batches were considerably different from that of the third. The result also showed that the change of alkali hydrolysable N in the soil was little, and organic matter, pH value, and total nitrogen decreased with different degrees at the end of the year, but the decreases were not remarkable.更多还原