川北地区紫花苜蓿品种筛选及栽培技术研究

用灰色系统理论对11个苜蓿（Medicago sativa）品种在川北丘陵低山区的生产性能(鲜草产量、干草产量、茎叶比、株高、分枝数、主根长、再生速度等指标)进行了分析，建立了综合评价模型，评价了各品种的生产性能。结果表明，各项指标在综合评价模型中的权重顺序为株高>分枝数>主根长>鲜草产量>茎叶比=再生速度>干草产量；在川北地区综合生产性能表现较好的紫花苜蓿品种是猎人河、霍普兰德和WL323等，爱菲尼特、特瑞和农宝等品种生产性能较差，苜蓿王和胜利两个品种虽然鲜草产量较高，但其再生速度慢，且苜蓿王茎叶比低，胜利干物质含量低，因而综合评价较差。

Selection and cultivation of introduced alfalfa varieties in North-Sichuan region

The production performances of introduced 11 alfalfa(Medicago sativa) cultivars in North-Sichuan region of China were evaluated by using the comprehensive evaluation model of grey relevancy theory based on seven main indexes,including fresh forage yield,dry forage yield,the ratio leaf to stem,plant height,branch number,main root length and regrowing rate.A comprehensive evaluation model was established in the study.By analyzing the data using the model,the results showed that the order of weight of seven indexes was fresh forage yield>dry forage yield>the ratio of leaf to stem>plant height>branch number>main root length>regrowing rate.Cultivars of Hunter river,Hoopuland and WL323 had relatively good productive performances,while Afliter,Terry and Farmer’s treasure had poor performances.Although Emperor and Victoty had higher fresh forage yields,but the comprehensive evaluation scores were low because of their slower regrowing rate,lower ratio of leaf to stem and dry material contents.