【摘要】 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P₂₅,水地 P₇₅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。更多还原

【Abstract】 Based on the field plot experiments for fertility gradients in fixed position in theyears 1984-1988 arranged in both rainfed and irrigated farmlands, the ficed postion stu-died were, made of rainfall produotive potential in perennial legume alfalfa species andheat productive potential respectivtly. It can be seen through the establishment ofregression equation between biomass broduction of alfalfa and fertilizer inputs that(a)fertilization either in rainfed farmlands or in irrigated farmland is an important meansto improve alfalfa production. The favourable fertilizer was P2.5 for rainfed farmlandsand P7.5 for irrigated land; (b)irrigation can raise total alfalfa Production; and (c)rainfallproductive potential for alfalfa is 1740 kg / mu; and heat productive potential is 2123kg/mu.更多还原