膜侧灌甜菜水肥耦合产量效应研究

Study on the Effect of Coupling of Water with Fertilizer on Beet Yield Irrigated from the Side of Plastic Mulch

合理的灌溉和施肥是增加作物产量的重要途径。采用三因素五水平二次回归通用旋转组合设计方法,在宁夏引黄灌区进行了甜菜膜侧灌水肥耦合试验,结果表明:在该试验条件下,灌溉定额对甜菜产量的影响最大,其次是施氮量,最后是施钾量;水肥耦合对甜菜产量的影响顺序为水氮耦合最大,水钾耦合次之,氮钾耦合最小,且水氮耦合具有协同效应,水钾耦合和氮钾耦合具有替代效应;并且经过水肥耦合模型模拟,得到了实现不同产量目标的最佳水肥组合指标,可作为指导干旱地区甜菜施肥和膜侧灌溉的参考。

Suitable irrigation and fertilizing are important approaches of increasing production. Based on the current rotary combination design method of square regression with three factors and five levels, the coupling of water with fertilizer experiment of beet irrigated from the side of plastic mulch was conducted in Ningxia irrigation district diverting water from Yellow River. The results showed that irrigation quota was the main factor affecting beet yield, nitrogen quantity was the secondary factor, kalium quantity was the third factor. The order of water and fertilizer interaction effect was that coupling of water with nitrogen was the first, coupling of water with kalium took the second place, and coupling of nitrogen with kalium was the least. And coupling of water with nitrogen had cooperative effect, coupling of water with kalium and coupling of nitrogen with kalium had substitute effect. Optimum combination indexes of water and fertilizer on different beet yield were gained through the model simulation and experiment, which can provide reference for the fertilization and irrigation in arid-region.