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Analysis of yield-determining process and its application to yield-prediction and culture improvement of lowland rice LXXI Combined effects of air-temperatures and water-temperatures at different stages of growth on the growth and morphological characteristics of rice plants



Analysis of yield-determining process and its application to yield-prediction and culture improvement of lowland rice LXXI Combined effects of air-temperatures and water-temperatures at different stages of growth on the growth and morphological characteristics of rice plants



Proceedings Crop Science Society Jap: 135-140



The increase in the number of tillers during each treated stage is little affected by air-temperature, but much by water-temperature. The maximum increase in the number of tillers is found at 31[degree]C at Stage I (rooting stage), at 36[degree]C at Stage I (tillering stage), at 16[degree]C and 36[degree]C at Stage HI (panicle initiation stage), respectively. The increase in plant height at Stage I is not influenced by air temperature, but only by water temperature, and its effectiveness for increasing the plant height is found in the following order, 31[degree]C > 36[degree]C > 21[degree]C > 16'C. At Stage II and HI both air temperature and water temperature have serious effects on increasing the plant height, and the order of their effectiveness for increasing it is also found as follows, i.e., 31[degree]C > 36[degree]C >21[degree]C > 16[degree]C. At Stage IV both air temperature and water temperature still affect the increase of plant height, but in this case the effectiveness of air temperature is a little stronger than that of water-temperature. The plant age in leaves is much more effectively increased by water temperature than by air temperature, and the plant age is markedly increased by high water temperatures such as 31[degree]C and 36[degree]C, while it is little increased by low water-temperatures such as 16[degree]C and 21[degree]C. The total number of leaves on the main stem is little affected by air temperature, but much affected by water temperature. In particular it is most severely affected by the latter at Stage II (tillering stage), and it is likely to be the more increased by the higher temperatures. The number of days required by the plant from transplanting time to heading time is little affected by air temperature, but much affected by water temperature in the early growth period and it is also remarkably affected by both air temperature and water temperature in the middle growth period (Stage HI and IV), but it is affected only by air temperature in the late growth period (Stage V). In any growth period a temperature of 31[degree]C (in air as well as in water) is most effective in hastening the heading time, while a temperature of 16[degree]C is most effective in delaying it. Combined effects of air and water temperatures at different stages of growth on the length of main culms, panicle length and the length of each leaf-blade, leaf-sheath and inter-node from the uppermost one to the downward 5th one were examined. As a result, it has been clarified that the air or water temperature at a particular stage has a conspicuous effect on lengthening a particular leaf-blade, leaf-sheath and inter-node and also the length of main culms as well as that of panicles. These relationships can be used effectively in diagnosing the defect in rice cultivation by a morphological examination of the hills of rice.

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Accession: 030069395

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DOI: 10.1626/jcs.33.135


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