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Research Article

Water Response of Upland Rice Varieties Adopted in Sub-Saharan Africa: A Water Application Experiment

Shunsuke Matsumoto1, Tatsushi Tsuboi2, Godfrey Asea3, Atsushi Maruyama1, Masao Kikuchi1 and Michiko Takagaki1*
1Graduate School of Horticulture, Chiba University, Chiba, Japan
2JICA Expert, JICA Uganda Office, Kampala, Uganda
3National Crops Resources Research Institute, Kampala, Uganda
Corresponding Author : Michiko Takagaki
Chiba University, Chiba, Japan
Tel: +81-47-308-8934
Fax: +81-47-308-8934
E-mail: [email protected]
Received January 09, 2014; Accepted February 10, 2014; Published February 13, 2014
Citation: Matsumoto S, Tsuboi T, Asea G, Maruyama A, Kikuchi M, et al. (2014) Water Response of Upland Rice Varieties Adopted in Sub-Saharan Africa: A Water Application Experiment. J Rice Res 2:121. doi: 10.4172/jrr.1000121
Copyright: © 2014 Matsumoto S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

Whether a rice Green Revolution in sub-Saharan Africa becomes a reality critically hinges on how far productive upland rice cultivation diffuses in the region. In order to quantify the drought tolerance, the rate of water response and the contribution of yield components to changes in yield due to water availability of upland rice varieties used in sub-Saharan Africa, we conducted water application experiments in Namulonge, Uganda, using NERICA 4, NERICA 10, NARIC 2 and Yumenohatamochi, with five different levels of water application. We found that the NERICA varieties were most drought tolerant, followed by NARIC 2. Yumenohatamochi did not withstand the lowest amount of water application of 378 mm. The results suggested that the minimum water requirement was around 311-400 mm per season for the three varieties used widely in East Africa, and around 420-600 mm for Yumenohatamochi, an upland variety in Japan famous in its drought tolerance. It was estimated that an additional water application of 1 mm increased rice yield by 11-12 kg /ha for the upland varieties tested. The high water response of upland rice was brought about by high water response of four yield components, among which the rate of grain filling contributed most to the increase in yield, followed by number of panicles/m2, number of grains per panicle and 1000- grain weight, in the order of the degree of contribution, for all the varieties tested.

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