Regional Yield Variation of Some Korean High-yielding Rice Varieties
2014
Won, Y.J., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Ahn, E.K., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Lee, J.H., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Suh, J.P., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Lee, J.S., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Chang, J.K., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Choi, Y.H., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Hwang, T.S., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Lim, Y.T., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Han, W.G., National Institute of Crop Science, RDA, Jeonju, Republic of Korea | Jeong, E.G., National Institute of Crop Science, RDA, Jeonju, Republic of Korea
In an effort to increase rice consumption and self-sufficiency ratio, the rice processing industry is using high-yielding rice varieties as raw materials recently. However, yield of the high-yielding rice varieties showed variation annually due to regional weather condition. It gives numerous difficulties to rice processors with unstable raw material supply and to farmers with unstable grain yield and income. Thus, this study was conducted to survey the regional yield variation of high-yielding rice varieties used for processing raw materials. For growth-related traits, ``Keunseom`` showed stable growth habit with the smallest variation by region, and other varieties showed moderate stability. Variation of yieldrelated traits was determined based on the number of grain per panicle, grain fertility, dehulling recovery ratio, and 1,000 grain rice weight. ¡®Keunseom¡¯ and ¡®Hanareum2¡¯ showed high stability to regional variation. Yield potential of the rice varieties in Gongju and Chungju was lower than the yield in the local adaptability test(LAT). In Boseong, however, yield potential of the rice varieties were similar to those of yield in LAT. Especially, ¡®Keunseom¡¯ showed the highest yield, 8.40 MT/ha. These results imply that the experiments on regional yield variation should be conducted in more regions for several years. Also, grain number per panicle was found to be the most important trait to increase yield potential of the high-yielding rice varieties. At the same time, improvement of grain fertility should be also considered in order to increase productivity of the high-yielding rice varieties.
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