Pedosphere 17(2): 257--264, 2007
ISSN 1002-0160/CN 32-1315/P
©2007 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Wheat grain yield and yield stability in a long-term fertilization experiment on the Loess Plateau |
HAO Ming-De1,3 , FAN Jun2,3, WANG Quan-Jiu2, DANG Ting-Hui1,3, GUO Sheng-Li1,3 and WANG Ji-Jun1 |
1 Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100 (China). E-mail: mdhao@ms.iswc.ac.cn;
2 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100 (China);
3 Northwest A & F University, Yangling 712100 (China) |
| ABSTRACT |
| To provide a scientific basis for sustainable land management, a 20-year fertility experiment was conducted in Changwu County, Shaanxi Province, China to investigate the effects of long-term application of chemical fertilizers on wheat grain yield and yield stability on the Loess Plateau using regression and stability analysis. The experiment consisted of 17 fertilizer treatments, containing the combinations of different N and P levels, with three replications arranged in a randomized complete block design. Nitrogen fertilizer was applied as urea, and P was applied as calcium superphosphate. Fertilizer rates had a large effect on the response of wheat yield to fertilization. Phosphorus, combined with N, increased yield significantly (P ≤ 0.01). In the unfertilized control and the N or P sole application treatments, wheat yield had a declining trend although it was not statistically significant. Stability analysts combined with the trend analysis indicated that integrated use of fertilizer N and P was better than their sole application in increasing and sustaining the productivity of rainfed winter wheat. |
| Key Words: dryland wheat yield, long-term fertilization, nitrogen, phosphorus, yield stability |
| Citation: Hao, M. D., Fan, J., Wang, Q. J., Dang, T. H., Guo, S. L. and Wang, J. J. 2007. Wheat grain yield and yield stability in a long-term fertilization experiment on the Loess Plateau. Pedosphere. 17(2): 257-264. |
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