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依据1984—1988年在旱作农田和灌溉农田布置的肥力梯度田区定位试验,分别对多年生豆科牧草紫花苜蓿的降水生产潜力和热量生产潜力进行了定位研究。通过建立苜蓿产草量与投肥量间的回归关系式,可以看出,a.无论在水地还是旱地,施肥都是提高苜蓿产量的重要手段,亩施肥水平,旱地P_(25),水地 P_(75)为宜。b.人工灌溉可以增加总产草量;c.苜蓿降水生产潜力为1740kg/mu,热量生产潜力为2123kg/mu。
Based on the fertility gradient field experiment of 1984-2008 in both undisturbed and irrigated farmland, the precipitation productivity and caloric productivity of perennial legume alfalfa were studied. By establishing the regression relationship between the yield of alfalfa and the amount of fertilizer, we can see that a. Fertilization is an important means to increase the yield of alfalfa, either in water or in dry land. Fertilizer application rate, dry land P 25, To P_ (75) is appropriate. b. artificial irrigation can increase the total amount of grass; c. alfalfa precipitation potential of 1740kg / mu, calorie production potential of 2123kg / mu.