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Effects of different soil types on the panicle traits and yield components of northern Japonica rice.

ZUO Jing-hong1,2, LI Jing-peng1, YANG Fu1**   

  1. (1 Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2013-01-10 Published:2013-01-10

Abstract:

Taking the northern Japonica rice varieties Dongdao 4 and Changbai 9 as test materials, this paper studied the characteristics of their panicle traits and yield components on paddy soil (pH=7.25, ESP=7.60) and soda salinesodic soil (pH=9.11, ESP=32.80). As compared with those on the paddy soil, most panicle traits of the rice varieties on the soda saline-sodic soil changed significantly, with a significant decrease in the branch number, branch length, and grain number. The grain yield components on the soda saline-sodic soil also had great change, among which, the grain number decreased significantly, with a decrement of 30.0% and 30.5% for the Dongdao 4 and Changbai 9, respectively. The correlation analysis of the grain yield per plant and the panicle traits showed that the spikelet per panicle had more contribution to the grain yield than the seed setting rate and 1000-grain weight. The decrease of the amount of primary branches could reduce the total grains of the primary branches per panicle, while the total grains of the secondary branches per panicle could be affected by both the amount of secondary branches and the grains per branch. On the soda saline-sodic soil, the secondary branch grains could be more sensitive to the changes of the environment, as compared with the primary branch grains.