The adaptability of different cultivars of sweet sorghum (Sorghum bicolor) was evaluated in different altitudinal areas of the Qinghai plateau from 2010 to 2011.There was a significant effect of altitude on growth period,plant height,fresh weight per plant,leaf number,stem and leaf yield and brix.At 1 850 m altitude fresh weight ranged from 111 127 to 139 840 kg/hm2,and all varieties matured normally with kernel yields ranging from 4 154 to 7 609 kg/hm2.At 1 990 m,altitude fresh weight ranged from 96 156 to 139 496 kg/hm2 while at 2 100 m,it was from 70 124 to 109 596 kg/hm2 and early varieties matured normally.At 2 300 m,altitude fresh weight ranged from 71 528 to 102 690 kg/hm2 and late varieties could not ear normally while at 2 500 m,it was from 41 340 to 61 034 kg/hm2 and early varieties eared normally.In areas at less than 2 300 m,stem brix was more than 15％ except that of late varieties.At 2 500 m,stem brix ranged from 6.52％ to 9.28％.The variety Jiutianzasan was the first choice at five different altitudes because its fresh weight was from 61 033.5 to 125 439.0 kg/hm2,its brix was from 9.28％ to 19.61％,and its kernel yield was 7 461 kg/hm2.At 1 850 m,Jitian No.5 and Super herder could also be candidates because of their adaptability.%2010-2011年在青海高原不同海拔生态区对甜高粱进行品种适应性研究,结果显示,海拔对生育期、茎秆高度、单株鲜重、叶片数、茎叶产量、糖锤度有极显著影响.海拔1 850m鲜重产量111 127～139 840 kg/hm2,籽粒成熟,产量4 154～7 609 kg/hm2;海拔1 990m鲜重产量96 156～139 496 kg/hm2;海拔2 100m鲜重产量70 124～109 596 kg/hm2,早熟品种籽粒能成熟；海拔2 300 m鲜重产量71 528～102 690 kg/hm2,晚熟品种不能抽穗；海拔2 500m鲜重产量41 340～61 034 kg/hm2,早熟品种能进入抽穗期.茎秆糖锤度海拔2 300m以下地区除晚熟品种较低外,可达15％以上,海拔2 500 m茎秆糖锤度只有6.52％～9.28％.九甜杂三品种综合表现突出,鲜重产量61 033.5～125 439.0 kg/hm2,糖锤度9.28％～19.61％.海拔1 850m籽粒产量7 461 kg/hm2,是推广种植的首选品种；吉甜5号、超级放牧者综合表现良好,可为候选品种.
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