水肥配合对玉米产量及其利用效率的影响

试验表明,在淮北地区,水、氮配合提高了玉米产量和效益,结果表现为灌溉比不灌溉增产10.9%,效益提高11.7%;施氮比不施氮增产77%~90%,效益提高82.8%~84.1%。同时,水、肥利用效率也明显提高,结果表现为水分利用率施氮比不施氮处理提高70%左右,灌溉比不灌溉处理提高5.8%;氮素当季相对利用率灌溉比不灌溉处理提高7.9%。通过数学模拟,给出灌溉与不灌溉两种水分条件下的氮肥效应方程。

Effect of coordination of water and fertilizer on maize yield and theirs utilization efficiency

The results obtained from filed experiment showed that coordination of water and fertilizer could increase maize yield and economic benefits in the region of north of Huaihe rive.Irrigation increased maize yield and profits by 11% and 11.7%,using different dosage nitrogen fertilizer increased maize yield and profits at range of 77.2?.5% and 82.8?.1%.At the same time,coordination of water and fertilizer could increase water and fertilizer utilization efficiency.Water-use efficiency were increased by 70% in treatments of using nitrogen fertilizer,and 5.8% in treatment of irrigation;the recovery rate of N fertilizer was increased by 7.9% in treatment of irrigation.The N fertilizer effective equation at different water conditions have been obtained by mathematic simulation.