Journal of Integrative Agriculture ›› 2014, Vol. 13 ›› Issue (9): 2028-2039.DOI: 10.1016/S2095-3119(14)60751-6

• 论文 • 上一篇    下一篇

Effects of Phosphorus Application in Different Soil Layers on Root Growth, Yield, and Water-Use Efficiency of Winter Wheat Grown Under Semi-Arid Conditions

 KANG Li-yun, YUE Shan-chao , LI Shi-qing   

  1. 1、Sate Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest Agriculture and Forestry University, Yangling 712100, P.R.China
    2、College of Forestry, Northwest Agriculture and Forestry University, Yangling 712100, P.R.China
  • 收稿日期:2013-09-25 出版日期:2014-09-22 发布日期:2014-09-24
  • 通讯作者: LI Shi-qing, Tel: +86-29-87016171, Fax: +86-29-87016171, E-mail: sqli@ ms.iswc.ac.cn
  • 作者简介:KANG Li-yun, Mobile: 15617620306, E-mail: kangliyun2004@126.com
  • 基金资助:

    This work was supported by the National Natural Science Foundation of China (31270553), the National 973 Program of China (2009CB118604), and the Special Fund for Agro- Scientific Research in the Public Interest of China (201103003).

Effects of Phosphorus Application in Different Soil Layers on Root Growth, Yield, and Water-Use Efficiency of Winter Wheat Grown Under Semi-Arid Conditions

 KANG Li-yun, YUE Shan-chao , LI Shi-qing   

  1. 1、Sate Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest Agriculture and Forestry University, Yangling 712100, P.R.China
    2、College of Forestry, Northwest Agriculture and Forestry University, Yangling 712100, P.R.China
  • Received:2013-09-25 Online:2014-09-22 Published:2014-09-24
  • Contact: LI Shi-qing, Tel: +86-29-87016171, Fax: +86-29-87016171, E-mail: sqli@ ms.iswc.ac.cn
  • About author:KANG Li-yun, Mobile: 15617620306, E-mail: kangliyun2004@126.com
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (31270553), the National 973 Program of China (2009CB118604), and the Special Fund for Agro- Scientific Research in the Public Interest of China (201103003).

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摘要： Deep phosphorus application can be a usefull measure to improve crops’ performance in semi-arid regions, but more knowledge of both its general effects and effects on specific crops is required to optimize treatments. Thus, the aims of this study were to evaluate the effects of phosphorus (P) application at different soil layers on root growth, grain yield, and water-use efficiency (WUE) of winter wheat grown on the semi-arid Loess Plateau of China and to explore the relationship between root distribution and grain yield. The experiment consisted of four P treatments in a randomized complete block design with three replicates and two cultivars: one drought-sensitive (Xiaoyan 22, XY22) and one drought-tolerant (Changhan 58, CH58). The four P treatments were no P (control, CK), surface P (SP), deep P (DP), and deep-band P application (DBP). CH58 produced larger and deeper root systems, and had higher grain yields and WUE, under the deep P treatments (DP and DBP) than under SP, clearly showing that deep P placement had beneficial effects on the drought-tolerant cultivar. In contrast, the grain yield and root growth of XY22 did not differ between DP or DBP and SP treatments. Further, root dry weight (RW) and root length (RL) in deep soil layer (30-100 cm) were closely positively correlated with grain yield and WUE of CH58 (but not XY22), highlighting the connections between a well-developed subsoil root system and both high grain yield and WUE for the drought-tolerant cultivar. WUE correlated strongly with grain yield for both cultivars (r=0.94, P<0.001). In conclusion, deep application of P fertilizer is a practical and feasible means of increasing grain yield and WUE of rainfed winter wheat in semi-arid regions, by promoting deep root development of drought-tolerant cultivars.

关键词: water stress , phosphorus application , soil layers , grain yield , root growth , water-use efficiency

Abstract: Deep phosphorus application can be a usefull measure to improve crops’ performance in semi-arid regions, but more knowledge of both its general effects and effects on specific crops is required to optimize treatments. Thus, the aims of this study were to evaluate the effects of phosphorus (P) application at different soil layers on root growth, grain yield, and water-use efficiency (WUE) of winter wheat grown on the semi-arid Loess Plateau of China and to explore the relationship between root distribution and grain yield. The experiment consisted of four P treatments in a randomized complete block design with three replicates and two cultivars: one drought-sensitive (Xiaoyan 22, XY22) and one drought-tolerant (Changhan 58, CH58). The four P treatments were no P (control, CK), surface P (SP), deep P (DP), and deep-band P application (DBP). CH58 produced larger and deeper root systems, and had higher grain yields and WUE, under the deep P treatments (DP and DBP) than under SP, clearly showing that deep P placement had beneficial effects on the drought-tolerant cultivar. In contrast, the grain yield and root growth of XY22 did not differ between DP or DBP and SP treatments. Further, root dry weight (RW) and root length (RL) in deep soil layer (30-100 cm) were closely positively correlated with grain yield and WUE of CH58 (but not XY22), highlighting the connections between a well-developed subsoil root system and both high grain yield and WUE for the drought-tolerant cultivar. WUE correlated strongly with grain yield for both cultivars (r=0.94, P<0.001). In conclusion, deep application of P fertilizer is a practical and feasible means of increasing grain yield and WUE of rainfed winter wheat in semi-arid regions, by promoting deep root development of drought-tolerant cultivars.

Key words: water stress , phosphorus application , soil layers , grain yield , root growth , water-use efficiency