施肥对绿洲区苜蓿与无芒雀麦混播草地生产性能的影响

特定施肥水平（N225kg／hm^2、P150kg／hm^2）T，对建植第3年不同比例（5：5、6：4、7：3）混播草地中苜蓿和无芒雀麦的株高、产草量、茎叶比及产草量变异系数进行了研究，结果表明：施肥对7：3混播草地中苜蓿和无芒雀麦株高、产草量促进作用最大。各比例混播草地年产草量施肥组和对照组差异极显著（P〈0．01）。7：3混播草地中，苜蓿和无芒雀麦的茎叶比施肥组均低于对照组，但5：5和6：4混播草地中，施肥组和对照组茎叶比无明显规律。7：3施肥组产草量变异系数最小。7：3建植的混播草地施肥组表现出较高的生产性能，可以获得优质高产的饲草。

Effect of Fertilization on Growth Performance of Alfalfa/Smooth Bromegrass Mixture Sward in Oasis

In particular fertilization level （ N 225kg,/hm^2, P 150kg/hm^2 ）, the effects of N, P fertilizers on the height, yield, stem/leaves and the coefficient of yield variation of individual species of three-year old alfalfa/smooth bromegrass mixture sward in Oasis under different planting ratio （5：5,6：4,7：3） were studied in this paper. The result showed that the height and yield of both alfalfa and smooth bromegrass in the 7 ： 3 trail were remarkably improved. The total annual forage production of different proportion mixture sward for both control and trial has significant difference（ P 〈 0.01 ）. The fertilization made the stem/leaves for both alfalfa and smooth bromegrass in the 7 ： 3 trail lower than control, but it had little effects on alfalfa/smooth bromegrass in the 5 ： 5 and 6 ： 4 trail. The yield coefficient of variation in 7 ： 3 trail was the least. The fertilization made the 7：3 trail mixture sward have higher growth performance, quality and yield.