Ecological Studies of Individual Variation in the Various Characters of Upland-cultured Paddy Rice

[摘要] Relationships between yields and individual variation in the various characters in plant community were studied in upland-cultured paddy rice. In this experiment two varieties and three densities were adopted to cause individual variation in the various characters of upland-cultured paddy rice.The results are as follows:1. The coefficient of variation of the characters such as culm number, panicle number and dry weight was greater than that of plant height, culm length and ear length (Table 3).2. The individual variation of the characters such as culm number, panicle number and dry weight could be compared with coefficient of variation, because the actual data were in conformity with the regression line between the standard deviation of the above-mentioned characters and the mean value of those. On the other hand, with the characters such as plant height, culm length and ear length it could not be compared with coefficient of variation, because the above-mentioned phenomenon was not ob served.3. The individual variation of each character of “Myojoo”, panicle number type variety, was greater than that of “Fujiminori”, panicle weight type variety.4. The individual variation of each character of upland-cultured paddy rice under high plant density was greater than under low plant density. Because there was severe competition among individuals under the high plant density (Table 5).5. The individual variation of each character decreased with progress of growth stage under the low plant density, but increased under the high plant density (Fig.5).

[学科分类] 农业科学（综合）