Abstract: A study was conducted on the yield of Medicago varia cv.Caoyuan No.2 and Melissitus ruthenica (L) cv.Zhilixing in irrigated and non-irrigated land,the two legumes’ plant height,stem weight,leaf weight,number of tillers,and inflorescence weight-plant parts that determine the yield of a forage.The result shows that in non-irrigated land,the greatest contributor to the yield of Medicago varia cv.Caoyuan No.2 is stem weight,followed by plant height,number of tillers,leaf weight,and the least affecting the yield is inflorescence weight.For Melissitus ruthenica (L) cv.Zhilixing in non-irrigated land,the sequence is number of tillers,leaf weight,stem weight,plant height,and ending with inflorescence weight.In irrigated land,the order of importance to the yield of Medicago varia cv.Caoyuan No.2 is number of tillers,leaf weight,stem weight,plant height,and inflorescence weight,while the sequence of weight to the Melissitus ruthenica (L) cv.Zhilixing yield is plant height,stem weight,leaf weight,number of tillers and inflorescence weight.

Key words: Grassland science, Forage variety, Yield formation factors, Correlation analysis, Analysis of path coefficient

摘要： 在灌溉区及旱作区,对草原二号杂花苜蓿和直立型扁蓿豆的株高、茎重、叶重、分枝数、花序重等产草量构成因素进行相关分析。结果表明:按对产草量贡献率的顺序,在旱作区杂花苜蓿为茎重>株高>分枝数>叶重>花序重,扁蓿豆为分枝数>叶重>茎重>株高>花序重;在灌溉区杂花苜蓿为分枝数>叶重>茎重>株高>花序重,扁蓿豆为株高>茎重>叶重>分枝数>花序重。

关键词: 草原学, 牧草品种, 产草量构成因素, 相关分析, 通径分析