Effect of Nitrogen Management on Yield and Water Use Efficiency of Rainfed Wheat and Maize in Northwest China
Effect of Nitrogen Management on Yield and Water Use Efficiency of Rainfed Wheat and Maize in Northwest China作者机构：institute of Soil and Water Conservation Cliinese Academy of Sciences and Ministry of Water Resources Northwest SciTech University of Agriculture and Forestry Yangling 712100 （China）. Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 （China） FAO/IAEA Agriculture and Biotechnology Laboratory Seibersdorf （Austria）
出 版 物：《Pedosphere》 (土壤圈（英文版）)
年 卷 期：2006年第16卷第4期
页 面：495-504页
核心收录：
主 题：wheat maize ^15N studies water use efficiency yield
摘 要：A field experiment with four treatments and four replicates in a randomized complete block design was conducted at the Changwu Experimental Station in Changwu County, Shaanxi Province, of Northwest China from 1998 to 2002. The local cropping sequence of wheat, wheat-beans, maize, and wheat over the 4-year period was adopted. A micro-plot study using ^15N-lahelled fertilizer was carried out to determine the fate of applied N fertilizer in the first year. When N fertilizer was applied wheat （years 1, 2 and 4） and maize （year 3） grain yield increased significantly （P 〈 0.05） （〉 30%）, with no significant yield differences in normal rainfall years （Years 1, 2 and 3） for N application at the commonly application rate and at 2/3 of this rate. Grain yield of wheat varied greatly between years, mainly due to variation in annual rainfall. Results of ^15N studies on wheat showed that plants recovered 36.6%-38.4% of the N applied, the N remained in soll （0-40 cm） ranged from 29.2% to 33.6%, and unaccounted-for N was 29.5%-34.2%. The following crop （wheat） recovered 2.1%- 2.8% of the residual N from N applied to the previous wheat crop with recovery generally decreasing in the subsequent three crops （beans, maize and wheat）.
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