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Journal of Arid Land  2014, Vol. 6 Issue (2): 230-242    DOI: 10.1007/s40333-013-0225-4
Research Articles     
Optimizing water and nitrogen inputs for winter wheat cropping system on the Loess Plateau, China
QiuPing FU1,2,3, QuanJiu WANG1,4*, XinLei SHEN5, Jun FAN1,6
1 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China;
2 College of Hydraulic and Civil Engineering of Xinjiang Agricultural University, Urumqi 830052, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China;
4 Xi’an University of Technology, Xi’an 710048, China;
5 Luohe Soil and Fertilizer Extension Service, Luohe 462300, China;
6 Northwest A&F University, Yangling 712100, China
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Abstract  Optimal use of water and fertilizers can enhance winter wheat yield and increase the efficiencies of water and fertilizer usage in dryland agricultural systems. In order to optimize water and nitrogen (N) management for winter wheat, we conducted field experiments from 2006 to 2008 at the Changwu Agro-ecological Experimental Station of the Chinese Academy of Sciences on the Loess Plateau, China. Regression models of wheat yield and evapotranspiration (ET) were established in this study to evaluate the water and fertilizer coupling effects and to determine the optimal coupling domain. The results showed that there was a positive effect of water and N fertilizer on crop yield, and optimal irrigation and N inputs can significantly increase the yield of winter wheat. In the drought year (2006–2007), the maximum yield (Ymax) of winter wheat was 9.211 t/hm2 for the treatment with 324 mm irrigation and 310 kg/hm2 N input, and the highest water use efficiency (WUE) of 16.335 kg/(hm2×mm) was achieved with 198 mm irrigation and 274 kg/hm2 N input. While in the normal year (2007–2008), the maximum winter wheat yield of 10.715 t/hm2 was achieved by applying 318 mm irrigation and 291 kg/hm2 N, and the highest WUE was 18.69 kg/(hm2×mm) with 107 mm irrigation and 256 kg/hm2 N input. Crop yield and ET response to irrigation and N inputs followed a quadratic and a line function, respectively. The optimal coupling domain was determined using the elasticity index (EI) and its expression in the water-N dimensions, and was represented by an ellipse, such that the global maximum WUE (WUEmax) and Ymaxvalues corresponded to the left and right end points of the long axis, respectively. Considering the aim to get the greatest profit in practice, the optimal coupling domain was represented by the lower half of the ellipse, with the Ymax and WUEmax on the two end points of the long axis. Overall, we found that the total amount of irrigation for winter wheat should not exceed 324 mm. In addition, our optimal coupling domain visually reflects the optimal range of water and N inputs for the maximum winter wheat yield on the Loess Plateau, and it may also provide a useful reference for identifying appropriate water and N inputs in agricultural applications.

Key wordscanalization      phenotypic plasticity      population expansion      secondary invasion     
Received: 16 April 2013      Published: 10 April 2014

This work was funded by the National Natural Science Foun-dation of China (51239009), the National Science and Tech-nology Support Program of China (2011BAD29B05), the Key Discipline Foundation of Water Resources and Hydropower Engineering of Xinjiang Province (XJZDXK-2002-10-05), and the Natural Science Foundation of Shandong Province (ZR2010EM042).

Corresponding Authors: QuanJiu WANG     E-mail:
Cite this article:

QiuPing FU, QuanJiu WANG, XinLei SHEN, Jun FAN. Optimizing water and nitrogen inputs for winter wheat cropping system on the Loess Plateau, China. Journal of Arid Land, 2014, 6(2): 230-242.

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