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Techniques of seedling raising for machine transplanting 7. occurrence of seedling rot as affected by temperature at seedling stage



Techniques of seedling raising for machine transplanting 7. occurrence of seedling rot as affected by temperature at seedling stage



Research Reports of the Rural Development Administration 28(MECH. TRANSPLANT RICE): 1-7



Occurrence of seedling rot and cultivar differences were evaluated under different temperature regimes at the National Research Center of Japan and Crop Experiment Station [Korea] in 1980 and 1985, respectively. For this several rice cultivars including Japonica-type and Tongil-type (Japonica/Indica) were used. The incidence of seedling rot was generally higher in Tongil-type cultivar than Japonica-type cultivar and also more severe at the plot that received low temperature (5.degree. C) during hardening stage. The low temperature affected the seedling profoundly when the treatment length is extended and also the lower the temperature treatment the greater the seedling rot incidence was observed. The effect of temperature fluctuation (day/night) on the seedling rot incidence also varied depending on temperature regimes: the highest incidence of seedling rot was recorded at 30.degree. C/5.degree. C treatment and followed by 35.degree. C/10.degree. C treatment while the least was observed at 25.degree. C/10.degree. C treatment. Degree of root activity reduction due to low temperature was greater for Taebaegbyeo (Tongil-type) compared to Nongbaeg (Japonica-type) while transpiration rate was not significantly reduced in Taebaegbyeo as encountered under low temperature.

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