On the study of the change of Paddy field utilization System in Tohoku district after the Second World War

构建新型水田利用制度已成为一个重要的社会政治问题。对二战后东北地区稻田利用制度的变迁进行了研究。我们之所以选择东北地区，是因为我们可以看到它的剧烈而典型的变化，例如一年两季，水田轮作，水田生产专业化，水田复垦，旱地改水田，水田种植旱地作物。发现要提高水田的利用率，必须走集约、多样化、组织化的耕作道路。

It has been an important social and political problem to construct the new utilization system of paddy field.We have researched into the change of paddy field utilization system in Tohoku District after the Second World War.The reason why we choose the Tohoku district is that we can see drastic and typical change of it, for example, two crop a year, paddy-upland rotation, specialization in rice production on paddy field, reclamation of paddy field, making the upland to paddy field, and cultivation of upland crop in paddy field.And we find that it's necessary to make a intensive, diversified, and organized farming for advancing the highly usage of paddy field.