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本试验以０～１４０ＫＲ６０Ｃｏ－射线辐照我国２５个苜蓿种和品种的干种子，研究苜蓿的辐射敏感性，确定苜蓿的适宜辐射剂量，结果表明：种子的活力指数、根长、幼苗存活率、苗高、株高、青草产量与剂量呈负相关。不同苜蓿品种辐射敏感性存在显著差异。应用模糊聚类分析法将２５个品种的辐射敏感性分为极敏感型、敏感型、中间型、迟钝型和极迟钝型５类。以苗高为指标，苜蓿品种的适宜辐射剂量在５０～１３５ＫＲ之间，不同品种之间相差２～３倍。
In this experiment, dry seeds of 25 alfalfa cultivars and varieties in China were irradiated with 0 ~ 140KR60Co- ray to study the radiation sensitivity of alfalfa and determine the appropriate radiation dose of alfalfa. The results showed that the seed vigor index, root length and seedling survival rate , Seedling height, plant height, grass yield and dose were negatively correlated. Radiation sensitivity of different alfalfa varieties were significantly different. Radiation sensitivity of 25 cultivars was divided into 5 categories of extremely sensitive type, sensitive type, intermediate type, slow type and very late type by using fuzzy cluster analysis. The seedling height as an indicator, the appropriate radiation dose of alfalfa varieties in the 50 ~ 135KR between the different varieties of 2 to 3 times.