高寒牧区苜蓿盖土越冬能力试验

Comparative Research on Overwintering of Alfalfa by Recovering Soil in Alpine Pasture Region

为了探索苜蓿品种在海拔2700 m高寒牧区盖土越冬能力,开展了8个品种比较试验,结果表明:入冬时盖土5-10cm,来年成活率12.61%-42.29%,没有盖土(CK)成活率为0。种植第1年不能进入开花期,株高24.52cm-31.03cm,鲜草产量1875.2kg·hm-2-4156.4kg·hm-2;盖土越冬成活的苜蓿能进入开花期,株高46.87 cm-69.99 cm,鲜草产量6 101 kg·hm-2-20536 kg·hm-2,干草产量1082 kg·hm-2-5348 kg·hm-2,品种间差异极显著(P<0.01),其中德福32IQ、皇后和阿尔冈金3个品种表现突出。

Eight kinds of alfalfas were comparative studied on the overwintering ability at the altitude of 2700 m. It was revealed that the survival ratio was about 12. 61 -42. 29% in the next year by recovering soil of 5 - 10 cm at the beginning of winter. However the survival ratio was 0 in the control plot（CK）. The alfalfa could not flower in the first year, and the plant height reached at 24.52 - 31.03 cm, and the yield of fresh grass was about 1875.2 -4156. 4 kg · hm^-2. But the survival alfalfa may enter the blossom period by recovering soil,and the plant height reached at 46.87 - 69. 99 cm, and the yield of fresh grass were measured at 6101 - 20536 kg · hm^-2, and the hay biomass was 1082 -5348 kg · hm^-2. Thus there was significant difference among the alfalfa varieties. Three kinds of alfalfa appeared outstanding performance ie. Medicago sativa cv. Defy 32IQ ,M. sativa cv. Queen and M. sativa cv. Algonquin.