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Journal of Integrative Agriculture  2013, Vol. 12 Issue (4): 621-629    DOI: 10.1016/S2095-3119(13)60280-4
Physiology & Biochentry · Tillage · Cultivation Advanced Online Publication | Current Issue | Archive | Adv Search |
Comparisons of Yield and Growth Behaviors of Hybrid Rice Under Different Nitrogen Management Methods in Tropical and Subtropical Environments
 Ibrahim Md, PENG Shao-bing, TANG Qi-yuan, HUANG Min, JIANG Peng , ZOU Ying-bin
1.College of Agronomy, Hunan Agricultural University, Changsha 410128, P.R.China
2.Crop Physiology and Production Center (CPPC), Huazhong Agricultural University, Wuhan 430070, P.R.China
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摘要  To compare the grain yield and growth behaviors of hybrid rice, field experiments were conducted in a subtropical environment in Changsha, Hunan Province, China, and in two tropical environments in Gazipur and Habiganj in Bangladesh during 2009 to 2011. Three hybrid rice cultivars were grown under three nitrogen (N) management treatments in each experiment. The results showed that grain yield was significantly affected by locations, N treatments and their interaction but not by cultivars. Changsha produced 8-58% higher grain yields than Bangladesh locations. Sink size (spikelet number per unit land area) was responsible for these yield differences. Larger panicle size (spikelet number per panicle) contributed to greater sink size in Changsha. Aboveground total biomass was greater in Changsha than in Bangladesh locations, whereas harvest index was higher in Bangladesh locations than in Changsha. Crop growth rate (CGR) was greater at Changsha than Bangladesh locations during vegetative phase, while the difference was relatively small and not consistent during the later growth phases. Higher leaf area index and leaf area duration were partly responsible for the greater CGR in Changsha. Real-time N management (RTNM) produced lower grain yields than fixed-time N management in more than half of the experiments. Our study suggested that further improvement in rice yield in the tropical environments similar to those of Bangladesh will depend mainly on the ability to increase panicle size as well as CGR during vegetative phase, and the chlorophyll meter threshold value used in RTNM needs to be modified according to environmental conditions and cultivar characteristics to achieve a desirable grain yield.

Abstract  To compare the grain yield and growth behaviors of hybrid rice, field experiments were conducted in a subtropical environment in Changsha, Hunan Province, China, and in two tropical environments in Gazipur and Habiganj in Bangladesh during 2009 to 2011. Three hybrid rice cultivars were grown under three nitrogen (N) management treatments in each experiment. The results showed that grain yield was significantly affected by locations, N treatments and their interaction but not by cultivars. Changsha produced 8-58% higher grain yields than Bangladesh locations. Sink size (spikelet number per unit land area) was responsible for these yield differences. Larger panicle size (spikelet number per panicle) contributed to greater sink size in Changsha. Aboveground total biomass was greater in Changsha than in Bangladesh locations, whereas harvest index was higher in Bangladesh locations than in Changsha. Crop growth rate (CGR) was greater at Changsha than Bangladesh locations during vegetative phase, while the difference was relatively small and not consistent during the later growth phases. Higher leaf area index and leaf area duration were partly responsible for the greater CGR in Changsha. Real-time N management (RTNM) produced lower grain yields than fixed-time N management in more than half of the experiments. Our study suggested that further improvement in rice yield in the tropical environments similar to those of Bangladesh will depend mainly on the ability to increase panicle size as well as CGR during vegetative phase, and the chlorophyll meter threshold value used in RTNM needs to be modified according to environmental conditions and cultivar characteristics to achieve a desirable grain yield.
Keywords:  crop growth rate       biomass production       hybrid rice       leaf area duration       leaf area index       real-time nitrogen management  
Received: 18 April 2012   Accepted:
Fund: 

The study was supported by the National Basic Research Program of China (2009CB118603) and the Green Super Rice (GSR) Project from the International Rice Research Institute (IRRI) for South Asia.

Corresponding Authors:  Correspondence ZOU Ying-bin, Mobile: 13973117515, Tel: +86-731-84618758, Fax: +86-731-84673648, E-mail:ybzou123@126.com     E-mail:  ybzou123@126.com
About author:  Ibrahim Md, E-mail: ibrahim1270@yahoo.com

Cite this article: 

Ibrahim Md, PENG Shao-bing, TANG Qi-yuan, HUANG Min, JIANG Peng , ZOU Ying-bin. 2013. Comparisons of Yield and Growth Behaviors of Hybrid Rice Under Different Nitrogen Management Methods in Tropical and Subtropical Environments. Journal of Integrative Agriculture, 12(4): 621-629.

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