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Persistent Identifier
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doi:10.7910/DVN/24221 |
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Publication Date
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2014-01-19 |
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Title
| Modifications in development and growth of a dual-adapted tropical rice variety grown as either a flooded or an aerobic crop |
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Author
| Clerget, BenoitIRRI-CESD, CIRAD
Bueno, CrisantaIRRI-CESD
Quilty, JamesIRRI-CESD
Correa, Teodoro Jr.IRRI-CESD
Sandroba, JosephIRRI-CESD |
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Point of Contact
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Use email button above to contact.
Benoit Clerget (IRRI-CESD) |
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Description
| As the human population continues to grow and competition for natural resources increases, there is a consequent need to produce more food with fewer resources. Flooded rice crops use large quantities of water, which becomes scarcer for farmers. New methods of saving irrigation water have been tested and released but they often suffer from a yield trade-off. A comparative study was carried out with a recent dual-adapted variety cultivated as either a flooded transplanted crop or a direct-seeded and soil water-saturated crop, referred to as an aerobic crop, to dissect the crop physiological differences induced by crop management. Experiments were conducted at IRRI's experiment station in Los Banos, Philippines, in the dry seasons of 2011 and 2012. Grain yields were 2 tons/ha or 25% lower in the aerobic crop as a result of a complex series of modifications and adjustments in plant architecture and yield components. Four main changes higher plant density, slower rate of leaf appearance, lower nitrogen content, and reduced size of all organs induced by the aerobic crop environment were responsible for three chains of modifications that resulted in lower biomass accumulation and finally lower grain yield. Leaf appearance rates were bilinear in both environments, initially similar in both environments and slower after an inflection point that occurred at the appearance of the 8th leaf in a erobic crops instead of the 11th leaf in flooded crops. As a consequence, two fewer leaves were produced by main tillers in aerobic crops, whose individual leaf area thus was much lower. In 2012, plant nitrogen content was about 1% lower in the aerobic crop than in the flooded crop during the entire crop duration. Biomass accumulation of the variety used was biphasic in both environments, with high radiation use efficiency during the two phases of effective biomass accumulation in flooded crops, and the standard radiation use efficiency expected with C3 species in aerobic crops during the same phases. |
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Keyword
| Oryza sativa L.
Aerobic rice
Phenology
Phyllochron
Radiation use efficiency
Nitrogen content
Plasticity |
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Notes
| Subject: null Type: CESD Notes: ; |
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Production Date
| 2011 |
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Distributor
| Field Crops Research (Elsevier) http://www.journals.elsevier.com/field-crops-research 
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Distribution Date
| 2013 |
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Depositor
| Jean Sabado |
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Deposit Date
| 2014-01-12 |
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Date of Collection
| Start Date: 2011-01; End Date: 2012-01 |
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Related Dataset
| Bouman, B.A.M., Lampayan, R.M., Tuong, T.P., 2007. Water Management in Irrigated Rice: Coping With Water Scarcity. International Rice Research Institute, Los Banos(Philippines).; Lafitte, H.R., Bennett, J., 2002. Requirements for aerobic rice: physiological and molecular considerations. In: Bouman, B.A.M., Hengsdijk, H., Hardy, B., Bindra-ban, P.S., Tuong, T.P., Ladha, J.K. (Eds.), Water-wise Rice Production. International Workshop on Water-wise Rice Production. 8-11 April 2002, Los Banos, Philippines. International Rice Research Institute, Los Banos (Philippines), pp.259-274.; Pandey, S., Velasco, L., 2002. Economics of direct seeding in Asia: patterns of adoption and research priorities. In: Pandey, S., Mortimer, M., Wade, L., Tuong, T.P., Lopez, K., Hardy, B. (Eds.), Direct Seeding: Research Issues and Opportunities. International Rice Research Institute, Los Banos (Philippines),pp. 3-14.; Yoshida, S., 1981. Fundamentals of Rice Crop Science. The International Rice Research Institute, Los Banos, Philippines. |
