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| Comparison of yield traits in rice among three mechanized planting methods in a rice-wheat rotation system |
| XING Zhi-peng1, 2, HU Ya-jie1, 2, QIAN Hai-jun1, 2, CAO Wei-wei1, 2, GUO Bao-wei1, 2, WEI Hai-yan1, 2, XU Ke1, 2, HUO Zhong-yang1, 2, ZHOU Gui-sheng1, 3, DAI Qi-gen1, 2, ZHANG Hong-cheng1, 2 |
1 Key Laboratory of Crop Genetics & Physiology of Jiangsu Province/Agricultural College, Yangzhou University, Yangzhou 225009, P.R.China
2 Innovation Center of Rice Technology in Yangtze Rice Valley, Ministry of Agriculture, Yangzhou 225009, P.R.China
3 Jointing Laboratory in Agricultural Sciences Between Agriculture and Agri-Food Canada (AAFC) and Yangzhou University, Yangzhou 225009, P.R.China |
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Abstract Understanding the differences in yield traits of rice among pothole seedling of mechanical transplanting (PSMT), carpet seedling of mechanical transplanting (CSMT) and mechanical direct seeding (MDS) is of great importance not only for rice scientists but also for rice farmers to develop a high-yield production system under mechanical conditions in a rice-wheat rotation system. However, such traits are yet to be studied among rice varieties of japonica-indica hybrid rice (JIHR), japonica conventional rice (JCR) and indica hybrid rice (IHR). Field experiments were conducted in 2014 and 2015, where six cultivars of the three rice types JIHR, JCR and IHR were grown individually with PSMT, CSMT and MDS methods, under respective managements for each method to achieve the maximum attainable yield. Results showed that (i) the PSMT significantly increased grain yield of JIHR by 22.0 and 7.1%, of JCR by 15.6 and 3.7% and of IHR by 22.5 and 7.4%, compared to MDS and CSMT on average across the two years, respectively. The highest yield was produced by the combination of JIHR and PSMT; (ii) high yield under PSMT was mainly attributed to large sink capacity and high-efficient dry matter accumulation. With sufficient panicles per hectare, the increase of spikelet number per panicle, especially the increase in spikelet number of the secondary rachis-branches was determined to be the optimal approach for developing a large sink capacity for rice under PSMT. The optimal tillers development, large leaf area index at heading stage, and high leaf area duration, crop growth rate and net assimilation rate during grain-filling phase could be the cause of sufficient dry matter accumulation for rice under PSMT; (iii) moreover, the PSMT favored plant growth as well as enriched the stems plus sheaths during grain-filling phase, as compared with CSMT and MDS. These results suggest that PSMT may be an alternative approach to increasing grain yield in a rice-wheat rotation system in the lower reaches of the Yangtze River in China.
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Received: 12 August 2016
Accepted:
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| Fund: The Special Fund for Agro-scientific Research in the Public Interest (201303102), the Major Independent Innovation Project in Jiangsu Province, China (CX(15)1002), the National Key Research Program of China (2016YFD0300503), the Science and Technology Plan of Jiangsu Province, China (BE2015340), the Research Innovation Program for College Graduates of Jiangsu Province, China (KYLX15_1369) and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, China supported this study. |
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Corresponding Authors:
Correspondence ZHANG Hong-cheng, Tel: +86-514-87979220, E-mail: hczhang@yzu.edu.cn; XU Ke, Tel: +86-514-87979220, E-mail: xuke@yzu.edu.cn
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| About author: XING Zhi-peng, E-mail: xing_pengpeng@126.com; |
Cite this article:
XING Zhi-peng, HU Ya-jie, QIAN Hai-jun, CAO Wei-wei, GUO Bao-wei, WEI Hai-yan, XU Ke, HUO Zhong-yang, ZHOU Gui-sheng, DAI Qi-gen, ZHANG Hong-cheng.
2017.
Comparison of yield traits in rice among three mechanized planting methods in a rice-wheat rotation system. Journal of Integrative Agriculture, 16(07): 1451-1466.
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