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Acta Agron Sin ›› 2016, Vol. 42 ›› Issue (06): 924-931.doi: 10.3724/SP.J.1006.2016.00924

• RESEARCH NOTES • Previous Articles     Next Articles

Effect of Mechanized Transplanting with High Hill Density and Single Seedling per Hill on Growth and Grain Yield in Super Rice

XIE Xiao-Bing,WANG Yu-Mei,HUANG Min,ZHAO Chun-Rong,CHEN Ja-Na,CAO Fang-Bo,SHAN Shuang-Lü,ZHOU Xu-Feng,LI Zhi-Bin,FAN Long,GAO Wei,ZOU Ying-Bin*   

  1. 湖南农业大学农学院, 湖南长沙 410128
  • Received:2015-12-18 Revised:2016-03-14 Online:2016-06-12 Published:2016-03-21
  • Contact: 邹应斌, E-mail: ybzou123@126.com; Tel: 0731-84618758 E-mail:xbxie_agri@163.com
  • Supported by:

    This study was supported by the Earmarked Fund for China Agriculture Research System (CARS-01-30).

Abstract:

The high sowing rate and poor transplanting performance hinder a large-scale mechanized transplanting of hybrid rice in China. In order to study the effects of mechanized transplanting with high hill density and single seedling per hill (MTHS) and conventional mechanized transplanting (CMT) on tillering, dry matter accumulation, radiation use efficiency, grain yield and its components, comparisons of seedling quality between printing sowing and conventional sowing, and field experiments between MTHS and CMT were conducted using hybrid rice cultivar Taiyou 390 and Wuyou 308 at Liuyang, Hunan Province and using Wuyou308 at Zhaoqing, Guangdong province. The results showed that leaf age, white root number, total root number, basal width of shoot, dry weight of shoot and dry weight of root of the printing sowing were more than those of the conventional sowing at two locations. The MTHS had significantly less maximum tiller number and effective tiller number than CMT, but had more spikelets per panicle and spikelets per m2, higher grain setting rate and 1000-grain weight, as well as significantly increased grain yield by 10.28−13.96%. On the other hand, The MTHS had more primary branch number and secondary branch number, longer panicle length, higher grain density and panicle weight than CMT, with significant differences. Although the MTHS had less dry matter accumulation and lower LAI than CMT before the heading stage , produced more dry matter at physiology maturity and had significantly higher harvest index and radiation use efficiency. Therefore, the MTHS could produce high grain yield for hybrid rice due to not only reducing sowing rate and improving seedling quality, but also increasing spikelets per panicle, spikelets per m2 and 1000-grain weight and improving grain setting rate, harvest index and radiation use efficiency.

Key words: Hybrid rice, Mechanized transplanting with high hill density and single seedling per hill, Dry matter, Radiation use efficiency, Grain yield

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