膜孔灌水肥对玉米产量的协同效应研究

[目的]研究玉米的水肥搭配,以充分发挥肥力的增产作用,提高玉米产量。[方法]采用2因素3水平正交试验设计进行田间试验,进而研究不同肥水结合对玉米产量的影响。[结果]玉米平均产量为471.7kg/亩,变化范围为437.6～496.5kg/亩。土壤含水量为14.5%时,肥效与水效主次效应的转换阈值为16.3kg/亩,施肥量超过16.3kg/亩时,水效〉肥效;施肥量小于16.3kg/亩时,水效〈肥效。施肥量为18.0kg/亩时,肥效与水效主次效应的转换阈值为15.4%,当土壤含水量〉15.4%时,水效〈肥效;土壤含水量〈15.4%时,水效〉肥效。水肥产量效应方程为报酬递减函数,当产量超过最大值后,随土壤含水量和施肥量的增大产量反而降低,理论上当土壤含水量为23.0%,施肥量为35.0kg/亩时,产量达到最大值549.0kg/亩。[结论]水肥存在明显的耦合效应,综合考虑水肥效应才能提高玉米产量。

Research on the Synergistic Effect of Water and Fertilizer in Film-pore Irrigation on Corn Yield

[Objective]The aim was to study the water and fertilizer matching of corn,so as to fully develop the yield increasing action of fertility and enhance corn yield.[Method]The 2-factor and 3-level orthogonal test design was used in field experiment and then the influences of different fertilizer and water combinations on corn yield were studied.[Result]The average corn yield was 471.7 kg/mu and its variation range was 437.6-496.5 kg/mu.When the water content in soil was 14.5%,the primary-secondary conversion t...