Influence of nitrogen application and shading on the sterile-type cold injury in rice
1989
Kim, H.D. | Kim, Y.H. | Kim, B.H. | Ree, D.W. (Kyonggi Provincial Rural Development Adminstrtaion, Hwasong (Korea Republic).) | Satake, Tetsuo (Hokkaido National Agricultural Experiment Stat., Sapporo (Japan))
This experiment was carried out to clarify the causes of sterility in terms of pollination characteristics for the sterile-type cold damage as influenced by amount of nitrogen application and shading conditions in rice plants. The number of young microspore per anther was not changed greatly by amount of nitrogen application. The number of ripened pollen grains per anther decreased according to increase in nitrogen application and shading degree, but the anther length and stigma length were not significantly affected by those factors. The number of pollen grains on stigma decreased by intense shading. The fertility decreased with increased nitrogen application and intensified shading. The elongation of auricle distance per day was less in less nitrogen application and intense shading. The internode length of the first and the second from the top were shortened with intense shading, but that of the fourth was elongated
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