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1. Up to the present time many authors have argued about correlation coeffisients in paddy rice such as the correlation coefficients between the stem length and yield per tan,or between number of heads and yield per tan. Or they have argued about the correlation coefficients between mean tempurature and yield, or between hours of sun shine and yield. But they all did not make clear the condition of the case in which the correelation coefficients exist. 2. The author explained in his investigations about"the yielding efficiency of Japanese rice varieties"that the same correlation coefficients between the stem length and yield per tan differs very much by the case in which the correlation are calculated. The correlations between stem length and yield per tan in the yearly case -- calculated by the yearly correlations are independent, and in the local case -- calculated by the local correlations are postive,and in the varietal case -- calculated by the varietal correlations are negative. And the same correlations between stem length and yield per tan by the same variety Norin No.1 under the yearly and local correlations are positive. 3. the correlation cofficients between number of heads and yield per tan in the yearly case, local case, varietal case, and the yearly and local case by the same variety are also positive. 4. The correlation coefficients between heading dates and yield per tan in the yearly case -- that is the correlations calculated when the years may change -- are negative, that is under the circumstance of the whole country the year when the heading dates are early the yields are high, the years when the heading dates are late the yields are low. There is no correlation between heading dates and yield per tan in the local case. That is, there is no difference on the yield where the heading dates are early or late. The correlation between heading dates and yield per tan in the varietal case is positive. That is the early varieties are of rmaller yields and the late varieties are of bigger yield. 5. It is very important to make clear the idea of the case in which the correlation coefficients are calculated to estimate the future yield of the year. Up to the present time some Japanese agriculturists calculated the correlation coefficients of yield per tan and stem base weight, or those between the numbers of panicles and yield per tan to estimate teh yield. But those attempts often include some misuuderstanding caused by the obscure conceptions about the case of correlation. 6. By investigations hitherto made the correlation coefficient between the stem base weight and yield per tan and the correlation coefficient between the numbers of panicles and yield per tan in the case of year are not yet made clear. The author considers that the correlation coefficients should be proved under the condition of the same year and the same local conditions. The correlations are calculated in the local case, in the yearly case and in the varietal case, these are different with each other.
日本作物学会の論文
1952-12-20

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