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Acta Agron Sin ›› 2013, Vol. 39 ›› Issue (04): 682-692.doi: 10.3724/SP.J.1006.2013.00682

• TILLAGE & CULTIVATION · PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Lodging Resistance of Super-Hybrid Rice Y Liangyou 2 in Two Ecological Regions

ZHANG Jun1,LI Gang-Hua1,SONG Yun-Pan1,ZHANG Wu-Jun1,YANG Cong-Dang2,WANG Shao-Hua1,DING Yan-Feng1,*   

  1. 1 Key Laboratory of Crop Physiology and Ecology in Southern China, Nanjing Agricultural University, Nanjing 210095, China; 2 Institute of Food Crop of Yunnan Academy of Agricultural Sciences, Kunming 650205, China
  • Received:2012-08-14 Revised:2012-12-12 Online:2013-04-12 Published:2013-01-28
  • Contact: 丁艳锋, E-mail: dingyf@njau.edu.cn, Tel: 025-84395066

Abstract:

Experiments were conducted with super-hybrid rice Y Liangyou 2 at Taoyuan, Yunnan Province and Danyang, Jiangsu Province in 2011 and 2012. The main objective of this study was to reveal the difference of lodging resistance and effects of nitrogen on rice lodging resistance between two ecological regions. Rice lodging indexes were 15% lower at Taoyuan than at Danyang. Bending moment of whole plant was 74.2% at Taoyuan lower than that at Danyang. Bending stress and dry matter weight of leaf sheath at basal stem made up the deficiency in stem diameter and wall thickness. There exited significantly negative correlations between lodging indexes and bending stress, snapping resistance at Taoyuan and Danyang. Plant height, height of ear-neck, height of gravity center increased significantly and bending stress, stem weight per centimeter decreased significantly with increasing nitrogen application rate in special high yield eco-region. For Tai Lake rice region, plant height, dry weight of three leaves from top increased significantly, and snapping resistance decreased significantly with increasing the rate of nitrogen. Thus increasing nitrogen application reduced lodging tolerance. Physical strength of stem decreased significantly with delaying nitrogen application, but it was beneficial to promoting the development of basal stem diameter and wall thickness.

Key words: Special high yield eco-site, Rice, Nitrogen, Lodging resistance

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