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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (9): 1698-1707.doi: 10.3724/SP.J.1006.2009.01698


Effects of  Seedlings Number per Hill on Grain Yield and Quality in Different Panicle Types of Mechanical Transplanted Japonica Rice

QIAN Yin-Fei1,2,ZHANG Hong-Cheng1,2,*,WU Wen-Ge1,3,CHEN Ye1,2,LI Jie1,2,GUO Zhen-Hua1,2,ZHANG Qiang1,2,DAI Qi-Gen1,2,XU Ke1,2,WEI Hai-Yan1,2   

  1. 1Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Crop Physiology,Ecology and Cultivation in Middle and Lower Reaches of Yangtze River of Ministry of Agriculture,Yangzhou University,Yangzhou 225009,China;2Rice cultivation Technology Innovation Center in the Middle and Lower Reaches of Yangtze River,Ministry of Agriculture,Yangzhou University,Yanghzou 225009,China;3Institute of Rice Science,Anhui Academy of Agricultural Sciences,Hefei 230031,China
  • Received:2009-02-19 Revised:2009-04-28 Online:2009-09-12 Published:2009-07-04
  • Contact: ZHANG Hong-Cheng, E-mail: hczhang@yzu.edu.cn; Tel: 0514-7979220


Field experiment was conducted under the rice-wheat two-ripe systems at the Lixia River area during the year 2006–2007, three mid-season japonica rice cultivars including Yanjing 9 (small panicle type), Huaidao 9 (medium panicle type) and 9 you 418 (large panicle type) were adopted to investigate the effects of five planting densities on yield and quality of mechanical-transplanted rice. Results showed that with the increase of seedlings per hill, the final panicles per plant increased while the number of grains per panicle, the grain filling rate and the 1000-grain weight decreased; and the yield of three cultivars increased firstand then decreased. The highest yield was obtained when rice was transplanted with 4 seedlings per hill for small panicle type, with 3 seedlings per hill for medium panicle type and with 2 seedlings per hill for large panicle type. With the increasing of seedlings per hill, the chalkiness degree, the chalkiness rate and the amylose content increased while the milled rice qualities and the protein content decreased, and the gel consistency became longer. Among all of the RVA profiles, the peak viscosity, hot viscosity, breakdown, the final viscosity and the pasting temperature increased first and then decreased. The setback decreased first and then increased.Considering the grain yield together with quality, we suggest that for the coordination of high-yielding and high quality rice transplanting should be with 4 seedlings per hill for small panicle type rice, 3 seedlings per hill for medium panicle type rice and with 2 seedlings per hill for large panicle type.

Key words: Mechanical transplanted japonica rice, Seedlings number per hill, Panicle type, Yield, Quality, RVA profile

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