不同水肥条件对马铃薯肥料N利用率的影响

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%

The comprehensive effects of the timing of watering and N and K fertilization(D),amount of irrigated water(W),and application rates of chemical N and K fertilizers,and farm manure(M) were studied by the design of orthogonal regression rotation with five factors and five levels under dry greenhouse condition.The N utilization efficiency of potato was in order of N>W>D>M>K.Under different application rates of W,N,K and M,the N utilization efficiency was significantly increased with optimum timing ...