On the Distribution of Favourable Zones for Barley Culture as seen from the Climatic Enviroment in Japan Proper

[摘要] It is the most important problem for the time to come, that we know distribution of favourable and unfavourable zones for barley culture as seen from the climatic environment to culture the right crop in the right locality in Japan proper.In this study has been investigated relation between the barley and climate by following two methods, i.e. annual comparative investigation and local comparative investigation.There are two varieties barley, which they have been cultured in Japan proper, common barley and naked barley, and those two varieties are contained in same species. (Hordium. Vulgare or Hordium. Sativum).I Relation between climate and yield of barley.A. Annual comparative investigation.Larger correlation coefficients between annual weather elements for each month from the autumn of the previous year until after harvest and yield of common barley and naked barley in the 3 prefectures (Common barley: Miyagi, Gunma and Gifu. Naked barley: Ibaragi, Hirosima and Kumamoto.) during the period from 1902 to 1933, are as follows. (Table I)B. Local comparative investigation.In this investigation has been compared climate with yield of barley in various districts of Japan proper from a horizontal view.Period of Barley culture is long in comparison with other crops and condition of influence of every climatic elements will vary with each stage of barley culture, ther_??_fore we must classificate the period of barley culture into some short stageI have been classificated on three stage, as such the first stage (from November to December) in which barley is planted, the s_??_cond stage (from January to March) to developing in it root of barley under the ground and the third stage in which barley is grown vigorously and borne fruit. (from April to June) Results of this investigation are as follows. (Table II)The result of above both investigation for relations with climate and barley, in which it infered that most important factor for barley culture is rainfall, is on the whole very similar to those of wheat. In a wood, barley grown as well as wheat on the same soil under the same cultural conditions contained, on average, a higher yields when grown in the district of slightly p_??_ecipitation than they did when grown in the humid climate of Japan.II Determination of climatic zones.As a result of above investigation between the weather and yield of barley has been determined eleven climatic zones for common barley and eight climatic zones for naked barley by the various degrees of analogicality of climatic environment.Favourable zones for common barley culture are Nagano-ken and every prefectures from Kanto district to Iwate-ken, and unfavourable zones climaticaly are every prefectures of the Japanese sea coast in the north of Fuk_??_i-ken and sou_??_heastdistrict in Japan proper.On the other hand, favourable zones for nake 1 barley culture are following prefectures, Okayama, Hyogo, Fagawa, Nagano, and every prefectures of the Pacific coast from Kanto district to T_??_hoku district, and unfavourable zones, in which naked barley can be cultured unsuccessfully, are every prefectures of the Japaneee sea coast of north of Fukui-ken.

[学科分类] 大气科学