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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (1): 93-103.doi: 10.3724/SP.J.1006.2009.00093

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

Effects of Nitrogen Rate and Transplanting Density on Physical and Chemical Characteristics and Lodging Resistance of culms in Hybrid Rice

YANG Shi-Min1,XIE Li1,ZHENG Shun-Lin1,LI Jing1,2,YUAN Ji-Chao1,*   

  1. 1Agronomy College,Sichuan Agricultural University,Ya'an625014,Sichuan;2Xichang College,Xichang 615000,China
  • Received:2008-04-04 Revised:2008-07-14 Online:2009-01-12 Published:2008-11-17
  • Contact: YUAN Ji-Chao E-mail:yuanjichao5@163.com

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Abstract:

There have been a lot of studies onthe differences and variations in lodging resistance among different rice varieties, but few studies involving the combined effects of nitrogen rate and transplanting density on lodging resistance of a certain hybrid varieties at different planting areas. In order to study the relationship between lodging resistance and physical and chemical characteristics of rice culm and the effects of nitrogen rate and transplanting density on the physical and chemical characteristics and lodging resistance of hybrid rice culm, a split plot field experiment was conducted with hybrid rice Jinyou 527 at Ya’an which altitude is about 600 m and Xichang which altitude is about 1 600 m. The experimental results were as follows. With the increasing of nitrogen rate and transplanting density, the plant height and length of basal internodes increased, the diameter of stem and the wall thickness of culm reduced, and the culm phenotype index decreased. High nitrogen rate and planting density lowered the contents of starch, cellulose and lignin of culm. The contents of N, K, Si, Ca, Mg, Fe, Zn, Cu, and Mn of culm were also influenced by nitrogen rate and transplanting density. As a result, high nitrogen rate and transplanting density reduced the breaking strength and lodging resistance of rice culm. The lodging index positively correlated to plant height gravity center height, length of basal internodes and contents of N and Mg, and negatively correlated to diameter of stem, wall thickness of culm, ratio of weight to length of stem, culm phenotype index, contents of K, Ca and starch, cellulose, lignin of culm. However, the relationship between lodging index and Si content of culm was quadratic function. The optimum Si content for high lodging resistance of rice culm was 4.5–4.8 mg kg-1. There were some differences in lodging resistance and sensitivities to nitrogen rate and transplanting density between Ya’an and Xichang, so the suitable techniques for high yield and high lodging resistance of culm should depend on the planting area. It was found that the critical lodging index for hybrid rice Jinyou 527 was 200.

Key words: Nitrogen rate, Triansplanting density, Culm, Physical and chemical characteristics, Lodging Resistance

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