? (JIA-2017-0754) Why high grain yield can be achieved in single seedling machine-transplanted hybrid rice under dense planting conditions
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DOI: 10.1016/S2095-3119(17)61771-4
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(JIA-2017-0754) Why high grain yield can be achieved in single seedling machine-transplanted hybrid rice under dense planting conditions
HUANG Min, SHAN Shuang-lü, XIE Xiao-bing, CAO Fang-bo, ZOU Ying-bin
Southern Regional Collaborative Innovation Center for Grain and Oil Crops (CICGO), Hunan Agricultural University, Changsha 410128, P.R.China
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摘要      为探明密植条件下单本机插杂交稻高产的原因,于2015和2016年在湖南省永安镇开展大田试验。每年采用2个杂交稻品种,设2个处理:单本机插和常规机插。结果表明,单本机插的平均产量比常规机插高12%。单本机插秧苗的株高、茎基宽、地上部干重和根干重均高于常规机插。单本机插由于最高分蘖数较少,进而导致其有效穗数少于常规机插。单本机插的每穗枝梗数(特别是二次枝梗数)和单位穗长着粒数均高于常规机插,进而使得其每穗粒数高于常规机插。单本机插的结实率较常规机插更高或相当。单本机插与常规机插粒重差异相对较小且年间无统一规律。单本机插的总生物量和收获指数较常规机插更高或相当。单本机插由于单茎叶面积较大,使得其单茎干重比常规机插更重。由此可见,秧苗素质、每穗粒数和单茎干重的提高是密植条件下单本机插杂交稻获得高产的重要原因。
Abstract This study was conducted to identify the factors associated with high grain yield in single seedling machine-transplanted hybrid rice under dense planting conditions.  Field experiments were done in Yong’an Town, Hunan Province, China in 2015 and 2016.  Two hybrid rice cultivars were grown under single seedling machine transplanting (SMT) and conventional machine transplanting (CMT) at a high planting density in each year.  Grain yield and yield attributes were compared between SMT and CMT.  Averaged across cultivars and years, grain yield was 12% higher under SMT than under CMT.  Plant height, basal stem width, and shoot and root dry weights were higher in seedlings for SMT than for CMT.  SMT had less maximum tiller number per m2 and consequently less panicle number per m2 than did CMT.  Branch number per panicle, especially the secondary branch number per panicle, and spikelet number per cm of panicle length were more under SMT than under CMT, which resulted in more spikelet number per panicle under SMT than under CMT.  SMT had higher or equal spikelet filling percentage than did CMT.  The difference in grain weight between SMT and CMT was relatively small and inconsistent cross years.  SMT had higher or equal total biomass and harvest index than did CMT.  Dry weight per stem under SMT was heavier than that under CMT.  Larger leaf area per stem was partly responsible for the heavier dry weight per stem under SMT than under CMT.  Our study suggests that improvement in seedling quality, panicle size, and dry weight per stem are critical to the high grain yield in single seedling machine-transplanted hybrid rice under dense planting conditions.  
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Key wordsgrain yield     hybrid rice     machine transplanting     single seedling     
Received: 2017-06-26; Published: 2017-10-19

This work was supported by the National Key R&D Program of China (2017YFD0301503) and the earmarked found for China Agriculture Research System (CARS-01).

Corresponding Authors: Correspondence HUANG Min, Tel: +86-731-84618758, E-mail: jxhuangmin@163.com   
Cite this article:   
HUANG Min, SHAN Shuang-lü, XIE Xiao-bing, CAO Fang-bo, ZOU Ying-bin. (JIA-2017-0754) Why high grain yield can be achieved in single seedling machine-transplanted hybrid rice under dense planting conditions[J]. Journal of Integrative Agriculture, Doi:10.1016/S2095-3119(17)61771-4
http://www.chinaagrisci.com/Jwk_zgnykxen/EN/10.1016/S2095-3119(17)61771-4      or     http://www.chinaagrisci.com/Jwk_zgnykxen/EN/Y0/V/I/0
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