豊凶考照試驗の因子分析について(1)
1952 年 7 巻 3-4 号 p. 83-85
詳細
1952 年 7 巻 3-4 号 p. 83-85
There have been many researches on the yield of rice-crop from the agroclimatological view-point in Japan. But the yield of rice-crop is resulted from the sum total of all the influences of environments from the time of planting to harvesting, including the quality of the seed, the condition of the soil and the social condition.
For the analysis of the influences of environments, we have applied the similar method of factor analysis as that has been adopted in the medical studies for the data on the yield of rice, for both early and middle-season crops, that resulted from the rice-experiments in 20 agricultural experiment stations of Japan covering the period of 30 years from 1911 to 1940, and obtained the coefficient of the first and second factors shown in Tables 1 and 2.
