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

构建新的水田利用制度已成为一个重要的社会和政治问题。我们对二战后东北地区水田利用制度的变化进行了研究。之所以选择东北地区，是因为我们看到了该地区发生的剧烈而典型的变化，如一年两熟、水旱轮作、水田专业化生产、水田开垦、变旱地为水田、水田种植旱作。我们发现，要提高稻田的高利用率，必须进行集约化、多样化、组织化的耕作。

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.