Effects of Temperature and Depth of Irrigation Water on Growth and Development in Paddy Rice (Oryza sativa L.)

概要

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Koshihikari and Hinohikari sown at three different times were grown under running and stagnant irrigation and in two water depth systems. The number of days required for transplanting to heading (DTH) was shortened as the date of sowing was put back. Rises in water temperature during the daytime were strictly checked under running irrigation and at 22cm depth, though the water temperature during nights was not different from surface to 22cm depth. Running irrigation extends DTH, while stagnant irrigation remarkably reduced DTH under high temperatures. A high water temperature induced by stagnant irrigation and deep flood irrigation accelerated elongation growth, and low temperature due to running irrigation reduced the rate of leaf emergence and final leaf number on the main stem. The effects of running and stagnant irrigation on dry matter production depended on the temperature environment during growing period, and running irrigation under high temperature and stagnant irrigation under low temperature acted positively on dry matter production. From those results, it was concluded that it is possible to control the growth and development of rice by changing irrigation type.
2006-02-20