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在旱棚控制条件下 ,用五因素五水平二次回归正交旋转组合设计 ,研究了水肥施用分配 ,补水量 ,施N量 ,施K量 ,有机肥施用量的综合作用效应 .结果表明 ,五因素对肥料N利用率的作用顺序为施N量 >补水量>水肥施用分配 >有机肥施用量 >施K量 .水肥施用分配相对于不同水、化肥 (N、K )、有机肥量的选择 ,可以大大地提高肥料N利用率 ;量少应重前施用 ,量多重后施或均施为好 .补水量与施N量的耦合规律为 :高水高肥效果最佳 ,肥料N利用率可达 5 7 83 % ,中水中N及低水低N次之 ,为 2 9 17%～ 40 99% ;高水低N或低水高N导致最低的利用率 ,为 2 2 87%或 2 2 5 1%
Under the condition of upstairs canopy, the combined effects of quadratic regression orthogonal rotation with five factors and five levels were used to study the combined effects of water and fertilizer application, water recharge, N application, K application and organic manure application.The results showed that, The order of the five factors on the utilization rate of fertilizer N was N application rate> water replenishment rate> application of water and fertilizer application> application rate of organic fertilizer> application of K application. The allocation of water and fertilizer was different from that of different water and chemical fertilizers (N, K) Selection, can greatly improve the utilization of fertilizer N; the amount should be less before heavy application, the amount of multiple post-application or are applied as good. Coupling of water and nitrogen application rate as: high-water and high-fat best, use of fertilizer N The rate of up to 5 7 83%, N and low water N in the water, followed by 2 9 17% ~ 40 99%; high water low N or low water high N lead to the lowest utilization rate of 2 2 87% or 2 2 5 1%