肥料
浸出(土壤学)
硝化作用
环境科学
氮气
矿化(土壤科学)
农学
播种
氮气循环
有机质
生长季节
生态学
土壤科学
土壤水分
生物
化学
有机化学
出处
期刊:Agronomy
日期:2015-10-26
卷期号:: 711-733
被引量:198
标识
DOI:10.2134/agronmonogr9.2.2ed.c35
摘要
Chapter 35 Nitrogen—Availability Indices Dennis R. Keeney, Dennis R. Keeney University of Wisconsin, Madison, WisconsinSearch for more papers by this author Dennis R. Keeney, Dennis R. Keeney University of Wisconsin, Madison, WisconsinSearch for more papers by this author Book Editor(s):A.L. Page, A.L. PageSearch for more papers by this author First published: 01 February 1983 https://doi.org/10.2134/agronmonogr9.2.2ed.c35Citations: 2Book Series:Agronomy Monographs AboutPDFPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShareShare a linkShare onFacebookTwitterLinked InRedditWechat Summary Numerous soil, climate, and management variables affect the yield and hence the nitrogen (N) needs of the crop. Some of these variables, particularly yearly weather patterns, are nearly impossible to predict in advance. Management, including economics of N fertilizer use, is important variables that are difficult to deal with quantitatively. Nitrogen mineralization from organic matter may be assessed directly by biological or chemical methods, or as is the usual case, by past knowledge gained from field trials. It is well established that in climates where extensive leaching, de-nitrification, or both do not normally occur before planting and during the growing season, the residual inorganic N in the root zone is approximately equivalent in availability to fertilizer N and should be taken into account in fertilizer N recommendations. Laboratory indices of soil N availability that have been proposed can readily be subdivided into biological and chemical tests. Citing Literature Methods of Soil Analysis: Part 2 Chemical and Microbiological Properties, 9.2.2, Second Edition RelatedInformation
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