loadingEstimation of Nitrogen Fertilizer Use Efficiency in
Dryland Agroecosystem
LI Shi-qing;LI Sheng-xiu
【期刊名称】《农业科学学报（英文版）》 【年(卷),期】2001(000)001
【摘要】A field trial was carried out to study the nitrogen fertilizer recovery by four crops in succession in manurial loess soil in Yangling. The results showed that the nitrogen fertilizer not only had the significant effects on the first crop , but also had longer residual effects, even on the fourth crop. The average apparent nitrogen fertilizer recovery by the first crop was 31.7%, and the accumulative nitrogen recovery by the 4 crops was high as 62.3%, and the latter was double as the former. It is quite clear that the nitrogen fertilizer recovery by the first crop was not reliable for estimating the nitrogen fertilizer unless the residual effect of nitrogen fertilizer was included. 【总页数】6页(89-94)
【关键词】Dry farming;Ecological systen of farmland;Nitrogen fertilizer recovery;Residual effect
【作者】LI Shi-qing;LI Sheng-xiu
【作者单位】College of Resources and Environmental Sciences, Northwest Science and Technology University of Agriculture and Forestry, Yangling , Shaanxi 712100;College of Resources and
Environmental Sciences, Northwest Science and Technology University of Agriculture and Forestry, Yangling , Shaanxi 712100 【正文语种】中文 【中图分类】S5 【相关文献】
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