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Analysis of yield-determining process and its application to yield-prediction and culture improvement of lowland rice LXX Combined effects of air-temperatures and water-temperatures at different stages of growth on the grain yield and its components of lowland rice



Analysis of yield-determining process and its application to yield-prediction and culture improvement of lowland rice LXX Combined effects of air-temperatures and water-temperatures at different stages of growth on the grain yield and its components of lowland rice



Proc Crop Sci Soc Jap: 53-58



Combining 4 classes of air-temperature (36, 31, 21 and 16[degree]C) with 4 classes of water temperature (36, 31, 21 and 16[degree]C) to give 16 different factorial conditions, and subjecting rice plants to these different conditions for a 15 -day period at different stages of growth under natural sunlight, the authors examined the combined effects of air- and water-temperature on the grain yield and its components. The variety used was Norin No. 25, a mid-term variety. In the early growth period only water temperature had a significant effect and air-temperature had no effect on yield. A water temperature of 31 [degree]C always had the most favorable effect, that of 21 [degree]C had the second best effect, and that of 16[degree]C had the most unfavorable effect on yield under any air temperatures. In the middle growth period (Stage III and IV), both air temperature and water temperature had serious effects on yield: under any water temperature an air temperature of 31 [degree]C increased yield most, while that of 16% decreased most; under most air temperatures a water temperature of 31 [degree]C increased yield the most, but under some other air temperatures a water temperature of 21 [degree]C was best. In the late growth period (Stage V and VI), only air temperature (21 [degree]C) had a significant effect, while water temperature had no effect on yield. At Stage V a remark-able detrimental effect of a high temperature of 36[degree] as well as that of a low temperature of 16[degree] was found, but at the Stage VI a low temperature as low as 16[degree]C had a beneficial effect on yield and high temperatures such as 36[degree] and 31[degree] have remarkable detrimental effects. It was also confirmed that the influences of air and water temperature which increase the yield can act only up to the spikelet initiation stage; in particular they act most at the initial stage of panicle differentiation, and after that stage only the influences which can prevent a reduction in yield can act.

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Analysis of yield-determining process and its application to yield prediction and culture improvement of lowland rice. 70. Combined effects of air temperatures and water temperatures at different stages of growth on the grain yield and its components in lowland rice. Proc. Crop Sci. Soc. Japan, 33: 53-58, 1964

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