| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
Growth and yield characteristics of rice varieties for Hokkaido region under the hotter air temperature than at present were clarified, and we investigated the yield estimation in future based on the rice varietal characteristics. Field experiment to analyze the rice characteristics under the hot condition was conducted at Ishigaki island in Okinawa prefecture located in the southernmost region in Japan. Rice developmental rate (DVR) model including not only air temperature but also solar radiation as meteorological variables we revised in this study increased its estimate accuracy relatively to traditional DVR model. Moreover, we developed the estimation methods for rice yield components with meteorological elements divided according to rice developmental stages. In future projection at 2.5℃ higher than at present, rice yield in a number of areas in Hokkaido sustains or decrease in comparison to the present, and the yield decreases especially in rice variety of panicle weight type.
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