论文部分内容阅读
采用二次回归正交设计,在移动旱棚水、肥精量控制条件下研究了土壤湿度和施氮量对春玉米产量、耗水量及水分利用效率的影响。结果表明:水氮耦合作用对玉米产量有显著的影响(P<0.05)。产量随着土壤湿度和施氮量的升高呈先增大后减小的趋势。分析产量模型可知,当土壤湿度为田间持水量的65%~70%、施氮量为462 kg·hm-2时,玉米产量可达15142.5 kg·hm-2。玉米不同处理阶段耗水量均表现为生育前期少,中期缓慢增加,到灌浆期迅速增加的趋势。全生育期耗水量和耗水强度均随土壤湿度的升高而增大,土壤湿度是影响耗水量、耗水强度及水分利用效率的主要因素,而施氮量的影响作用较弱。
The quadratic regression orthogonal design was used to study the effects of soil moisture and nitrogen application rates on the yield, water consumption and water use efficiency of spring maize under the condition of moving water and fertilizer. The results showed that water and nitrogen coupling had a significant effect on corn yield (P <0.05). The yield increased first and then decreased with the increase of soil moisture and nitrogen application rate. Analysis of the yield model shows that when the soil moisture is 65% -70% of the field capacity and the nitrogen application rate is 462 kg · hm-2, the yield of maize can reach 15142.5 kg · hm-2. The water consumption in different treatment stages of maize all showed the tendency of less pre-growth period, moderate increase in middle period and rapid increase in filling stage. Water consumption and water consumption during the whole growth period all increased with the increase of soil moisture. Soil moisture was the main factor affecting water consumption, water consumption intensity and water use efficiency, while the effect of nitrogen application was weak.