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选用我国西北的主要牧草苜蓿、沙打旺、草木樨、三叶草、小冠花及偃麦草等９６个品种，用６０Ｃｏγ射线照射干种子，测定出苗率。辐照剂量与出苗率的相关关系分析表明，出苗率与剂量之间呈显著、极显著的负相关，出苗率随辐照剂量的增加而降低。计算出各品种的半致死剂量，并按辐射敏感性将牧草品种划分为敏感型、中间型和迟钝型三类。其中敏感型品种１４个（含禾本科牧草品种１０个），占总数的１４．５９％；迟钝型品种１１个（含小冠花品种８个），占总数的１１．４６％；中间型品种７１个，包括２５个苜蓿、７个三叶草、７个草木樨和５个沙打旺等主要豆科牧草品种，占总数的７３．９５％。
Ninety-six cultivars, alfalfa, Astragalus adsurgens, shrubs, clover, small crown flowers and thinopyroses, were selected from the main pastures of northwestern China. The seeds were irradiated with 60Coγ ray to determine the germination rate. The correlation analysis between the radiation dose and the emergence rate showed that there was a significant and extremely significant negative correlation between the emergence rate and the dose, and the emergence rate decreased with the increase of the radiation dose. The semi-lethal dose of each species was calculated. According to the radiation sensitivity, the pasture varieties were divided into three types: sensitive, intermediate and retarded. Among them, 14 sensitive cultivars (including 10 grassy grasses) accounted for 14.59% of the total; 11 insensitive cultivars (including 8 small crown flowers), accounting for 11.46% of the total; intermediate varieties 71, including 25 alfalfa, 7 clover, 7 grass mullet and 5 sand legumes and other major leguminous species, accounting for 73.95% of the total.