采用适定性参数法对 1 998～ 1 999年度北方甘薯区域试验产量结果进行丰产性、稳定性和适应性分析。结果表明 ,鲜薯产量 :宁R97 5、徐 54 1丰产性、稳定性较好 ,适应性广 ;烟 93 2 51虽然产量高 ,但稳定性差 ,对环境反应敏感 ;其余品种丰产性较差。薯干产量 :宁R97 5、徐54 1丰产性、稳定性好 ,适应性广 ;济 891 2 1、豫薯 1 2号虽然产量高 ,但稳定性差 ;其余品种丰产性较差。 By using the method of fitness parameter, the yield, stability and adaptability of the northern sweet potato region trial from 1998 to 1999 were analyzed. The results showed that the yield of fresh potato: Ning R97 5 and Xu 54 1 were high yield, good stability and wide adaptability. Although the yield was high, the yield was poor and the reaction was sensitive to the environment. The yield of other varieties was poor. Dry sweet potato yield: rather R97 5, Xu 54 1 high yield, good stability, wide adaptability; economic 891 2 1, Yushu No. 12 although the yield is high, but the stability is poor; other varieties of poor yield.