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Testing method of foehn tolerance and selection of tolerant varieties in rice

Testing method of foehn tolerance and selection of tolerant varieties in rice

Research Reports of the Rural Development Administration (Suweon) 30(2 RICE): 7-13

This study was conducted to get basic information about selection of foehn tolerant varieties and testing method of foehn tolerance in rice. In the testing method of foehn tolerance, the most effective pretreatment method was the treatment of "excess-humidity in dark". By this pretreatment, the average ratio of ripened grain was decreased but the ratio of white head was increased. The white head ratio had high positive correlation with culm length, panicle length, number of grains per panicle, flag leaf length and necknode thickness, but it had negative correlation with number of panicles per hill. In the path-coefficient analysis, the direct effect of number of grains per panicle was higher than that of any others. The correlation between the decreasing ratio of ripened grain in wind tunnel and the increasing ratio of white head in field was significant (r=0.770**). Varietal difference of foehn tolerance among the cultivars of rice was found. Tolerant varieites to foehn phenomenon were Yeongdeogbyeo and Chilseongbyeo, and sensitive varieties were Sangpungbyeo, Namyangbyeo and Chucheongbyeo.

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