Dry matter production and nitrogen absorption of japonica-indica hybrid rice cultivars grown under upland conditions - a comparison with Japonica cultivars

Wada, Y.; Yun, S.; Sasaki, H.; Maeda, T.; Miura, K.; Watanabe, K.

Japanese Journal of Crop Science 71(1): 28-35


Accession: 003719261

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Japonica-indica hybrid rice cultivars, Suweon 287 and Suweon 290, showed a high yield under upland and lowland cultivation conditions. This study was conducted to elucidate the high yielding ability of these japonica-indica hybrid rice cultivars under upland conditions through the examination of dry matter production and nitrogen absorption. These cultivars were compared with the japonica upland and lowland cultivars, Toyohatamochi and Koshihikari. Suweon 287 and Suweon 290 had a large leaf area index and large sink capacity, determined by grain number and grain weight, which might be caused by the increased nitrogen absorption before anthesis. These cultivars showed a higher crop growth rate after anthesis mainly due to the high mean leaf area index during the ripening period. In addition, these cultivars showed relatively high net assimilation rates despite showing high mean leaf area index during the ripening period. Therefore, it may be concluded that the japonica-indica hybrid rice cultivars have a high yielding capacity even under upland conditions. In a trial conducted in Japan in 1995, which was characterized by a dry growing season in August, Suweon 287 and Suweon 290 showed higher photosynthetic rates under both insufficient and sufficient soil water conditions compared with the two japonica cultivars, indicating the high drought resistance of the japonica-indica hybrid rice cultivars.