Pedosphere 16(4): 495--504, 2006
ISSN 1002-0160/CN 32-1315/P
©2006 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of nitrogen management on yield and water use efficiency of rainfed wheat and maize in northwest China |
DANG Ting-Hui 1, CAI Gui-Xin2, GUO Sheng-Li1, HAO Ming-De1 and L. K. HENG3 |
1 Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100 (China). E-mail: dangth@ms.iswc.ac.cn;
2 Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China);
3 FAO/IAEA Agriculture and Biotechnology Laboratory, Seibersdorf (Austria) |
| ABSTRACT |
| 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-labelled 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 soil (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). |
| Key Words: wheat, maize, 15N studies, water use efficiency, yield |
| Citation: Dang, T. H., Cai, G. X., Guo, S. L., Hao, M. D. and Heng, L. K. 2006. Effect of nitrogen management on yield and water use efficiency of rainfed wheat and maize in northwest China. Pedosphere. 16(4): 495-504. |
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