播量对红豆草和苜蓿生产特性的影响

在临潭县冶力关镇海拔2 590 m的梯田，于早春以不同播量种植甘肃红豆草（Onobrychis viciaefolia cv.Gansu）(70、100和130 kg/hm2)和甘农一号杂花苜蓿（Medicago varia cv.Gannong No.1）(7、10和13 kg/hm2 )，观测其物候期、株高、生长率、产量、营养动态及翌年越冬率，探讨其在高寒山区的生产性能及适应性。结果表明，播种当年两种牧草均未完成生活史，停留在分枝期，但翌年越冬率都在95%以上，都能安全越冬；甘肃红豆草100 kg/hm2播量下的鲜草和干草产量最高，分别为11 734.0和3 357.8 kg/hm2 ，甘农一号杂花苜蓿13 kg/hm2播量下的鲜草和干草产量最高，分别为5 217.5和1 690.9 kg/hm2 。不同播量对两种牧草的养分影响较小，其变化趋势一致，在8月5日之后粗蛋白、粗灰分和磷含量呈降低趋势，粗纤维含量逐渐上升。甘肃红豆草和甘农一号杂花苜蓿分别以100 kg/hm2播量和播量13 kg/hm2的草产量高，且适应性强，饲料利用价值较高，在甘肃临潭县可作为饲草利用。

Effects of sowing quantity on production characteristics of Onobrychis viciaefolia and Medicago varia at alpine region in Lintan County

Onobrychis viciaefolia cv.Gansu and Medicago varia cv.Gannong No.1 were planted with different sowing quantity(O.viciaefolia cv.Gansu with 70,100 and 130 kg/ha and M.varia cv.Gannong No1 with 7,10 and 13 kg/ha) in the early spring on the terraces of 2 590 m above sea level at Yeliguan Town in Lintan County.During the study phenology of two varieties was observed;plant height,growth rate,yield,nutrient dynamics and winter survival rate were measured;and the productivity and adaptability of them on alpine region were also discussed.The results showed that the winter survive rate of two varieties was over 95% although they were not complete their life cycle in the sowing year.Yields of fresh forage and hay of the O.viciaefolia cv.Gansu the sowing quantity(100 kg/ha) were the highest,which were 11 734.0 and 3 357.8 kg/ha,respectively.Yields of fresh forage and hay of the M.varia cv.Gannong No.1 at 13 kg/ha were the highest,which were 5 217.5 and 1 690.9 kg/ha,respectively.There was little effect on the nutrient contents of two varieties at the different sowing quantity.However,crude protein,crude ash and phosphorus contents tended to decrease,while crude fiber content increased gradually after August 5th.O.viciaefolia cv.Gansu and M.varia cv.Gannong No.1 with the sowing quantities at 100 and 13 kg/ha respectively had the high performances and strong adaptability,so they can be used as forage at Lintan in the future.