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在河西走廊的灌漠土上,制种玉米产量随N素用量的增加而增加,但单位N素的增产效果则随N素用量的增加而递减。经回归统计分析,在肥力水平高的暗灌漠土上,玉米N素经济效益最佳施肥量为124.81kghm-2,最佳施肥量时的理论产量为9.65thm-2;在肥力水平中等的灰灌漠土上,玉米N素经济效益最佳施肥量为93.52kghm-2,最佳施肥量时的理论产量为7.30thm-2;在肥力水平低的盐化灌漠土上,玉米N素经济效益最佳施肥量为80.52kghm-2,最佳施肥量时的理论产量为5.90thm-2。
In the irrigated desert soil in Hexi Corridor, the yield of maize seed increased with the increase of N content, but the yield increase of N element decreased with the increase of N content. Through regression analysis, the optimal economic benefit of maize N was 124.81kghm-2 and the theoretical yield was 9.65thm-2 at the optimal fertilization level on the dark-irrigated desert with high fertility level. On gray desertification soil, the best economic benefit of corn N was 93.52kghm-2, and the optimum yield was 7.30thm-2. On the saline-desert soil with low fertility, The best economic benefit is 80.52kghm-2, and the best yield is 5.90thm-2.