河西走廊灌漠土不同肥力水平下制种玉米氮素适宜用量的研究

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。

Studies on Suitable Dosage of Nitrogen for Producing Maize Seed under the Irrigated Desert Soils of Different levels of fertility in Hexi Corridor

Output of producing maize seed increased with the raise of N applied, but increasing production effect of unit N decreased with the increase of N on the irrigated desert soils in Hexi Corridor. Statistical analysis showed that the optimum amount of N for maize economic benefit was 124.81kg hm-2 and the theoretical yield of optimum amount of fertilization was 9.65t hm-2 on dark-irrigated desert soil with high fertility. Analysis also showed that the optimum amount of N for maize economic benefit was 93.52kg hm-2 and the theoretical yield of optimum amount of fertilization was 7.30t hm-2 on gray irrigated desert soil with medium fertility and the optimum amount of N for maize economic benefit was 80.52kg hm-2 and the theoretical yield of optimum amount of fertilization was 5.90t hm-2 on salinity irrigated desert soil with low fertility.