十勝地方の作物型

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1. From a meteorological point of view, farm crops have been grouped by the author (1950) into five types, of which three are found in Tokachi District, Hokkaido. Naked barley and flax belong to the first crop type ; rice, corn and legumes to the second type, and sugarbeets and cereals other than the naked barley to the fifth type. 2. The climatic type of Tokachi District is symbolically expressed BC'b and that of Aomori Prefecture BC'a. Continental localities at the corresponding latitudes differ from these in their precipitation effectiveness index of THORNTHWAITE (1931) in being C instead of B ; thus the climatic types of the northern, middle and southern parts of Manchuria are CC'b, CC'a and CC'a', respectively. 3. Rice, barley, soybeans and sugarbeets belong to the same crop type without regard to the differences in their precipitation effectiveness indices. Rice and soybeans are of the same crop type regardless of the existing variation in the mean temperature of the hottest month (KOPPEN, 1931). 4. The summations of the absolute values of the correlation coefficients between the yield and the three important monthly meteorological data, the mean temperature, the hours of sunshine and the amount of rainfall, have been carried out and the results have been compared among them ; rice, wheat, oats, soybeans, small red beans and sugarbeets have the greatest value of such summation for the monthly mean temperature, naked barley, field beans, peas, potatoes and flax have it for the hours of sunshine, and barley and corn for the amount of rainfall. 5. The monthly sums of the absolute values of all the coefficients of correlation between the yield and the three meteorological data mentioned above have been _obtained ; naked barley and corn have each their greatest sum in May ; rice, wheat, soybeans, small red beans, potatoes and flax have it in June ; barley and peas in July ; oats and sugarbeets in August, and field beans in September. On these reasons we can approximately predict the yield of rice, for instance, sometime between June and August, that of oats in July or August, of soybeans in June or July, and of sugarbeets between July and September. For other crops also we can predict their yields by finding out their respective largest sums of coefficients of correlation as stated above.
帯広畜産大学の論文
1954-03-30

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