作　　者： ; ; ; ; ; ; ;

机构地区： 石河子大学农学院

出　　处： 《新疆农业科学》 2010年第5期859-864,共6页

摘　　要： 【目的】研究滴灌和漫灌下不同施肥量对棉花氮素吸收的影响。滴灌和漫灌不同灌溉方式在不同施肥处理（N 240、360和480 kg/hm^2）下0-100 cm土层土壤NO3^--N分布及棉花氮素吸收。【方法】通过网室土柱模拟实验,研究滴灌和漫灌在不同施肥处理（N 240、360和480 kg/hm^2）下,0-100 cm土层土壤NO3-N分布及棉花的氮素吸收。【结果】滴灌各施肥处理硝酸盐主要积聚在40-60 cm土层,漫灌各施肥处理主要积聚在60-80 cm土层。棉花氮肥利用率相对较低为16.47%-28.37%;不同施肥量下土壤0-100 cm土层硝态氮残留量较高为60%-81%,且N240和N480施肥处理漫灌残留量均高于滴灌;氮肥总回收率比较高,各处理均达到87%以上。【结论】滴灌、漫灌下作物氮素吸收量差异不显著。 【Objective】This paper studied the distribution of nitrate-N in soil profile of 0-100 cm and N absorption under drip irrigation and flooding irrigation in cotton field.【Method】Using soil column method in a mesh house,N was applied at the rates of 240,340 and 480 kg/hm^2 respectively.【Result】The result showed that the content and moving depth of nitrate-N increased with the increase of nitrogen fertilizer rate,both in flooding irrigation and drip irrigation.The highest N-residuals appeared at 40-60 cm depth in soil profile under drip irrigation,while in flooding irrigation,nitrate-N concentrated at 60-80 cm depth in soil profile.N use efficiency of cotton was relatively low,from 16.47% to 28.37%;The residue of nitrate-N at 0-100 cm was between 60%-81%,and NUE under drip irrigation in N240 and N480 treatment was higher than in flooding irrigation.The rates of total N recovery was higher than 87% at all the treatments.【Conclusion】No significant differences were observed in cotton N absorption amount between drip irrigation and flooding irrigation.

关 键 词： 灌溉方式 棉花 硝态氮 分布

领　　域： [农业科学]