Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (7): 1323-1334.doi: 10.3864/j.issn.0578-1752.2013.07.003

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

Effect of Nitrogen Application on Stem Lodging Resistance of Rice and Its Morphological and Mechanical Mechanisms

 LI  Guo-Hui, ZHONG  Xu-Hua, TIAN  Ka, HUANG  Nong-Rong, PAN  Jun-Feng, HE  Ting-Hui   

  1. 1.Rice Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Key Laboratory of New Technology in Rice Breeding, Guangzhou 510640
    2.College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070
    3.College of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641
  • Received:2012-11-02 Online:2013-04-01 Published:2013-01-25

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Abstract: 【Objective】 Lodging is one of the important constraints to high yield and stable production of rice. This study investigated the effects of nitrogen application on stem lodging resistance and its relationship with stem morphological and mechanical traits. The mechanisms of stem lodging resistance were explored. Results of the study will provide a theoretical basis for lodging resistance and high yield cultivation of rice. 【Method】 An indica rice cv. Yinjinruanzhan was grown in field experiments conducted with four nitrogen levels at Guangzhou. Lodging index and morphological and mechanical traits of basal culms were measured.【Result】As nitrogen input increased, plant height, gravity center height and basal internode length increased, basal internode plumpness declined, breaking resistance and elastic modulus decreased, lodging index increased and lodging resistance declined. Nitrogen treatment affected stem morphological and mechanical traits of rice. Lodging index was positively correlated with plant height, gravity center height and basal internode length, while negatively correlated with basal internode plumpness, breaking resistance and elastic modulus, and mostly significant. Positive correlation was found between lodging index and spikelet number per m2, while the correlation between lodging index and filled grain rate and 1000-grain weight were negative.【Conclusion】Nitrogen application affects stem lodging resistance through morphological traits such as plant height, gravity center height, basal internode length, basal internode plumpness, and mechanical traits such as stem bending moment and breaking resistance.

Key words: lodging index , nitrogen application , morphological traits , mechanical traits , rice

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