抄録
In relation to the abnormal rice growth on new lands or old lands uncropped to rice for several years, investigations were made on the various features of abnormal rice growth, its occurrence, its relations to soil conditions, varieties, cultural conditions and methods of irrigation. The various grades of abnormality in the development of rice panicles from the formation of primordia to the seed-completion, characterized the phenomenon, and the fact was made clear that it was due to the water-lodged condition in certain kinds of soil. The author concluded that the phenomenon might fall into the same category, considered from its characteristic features and conditions for its occurrence, as the straighthead of rice reported in the United States of America, and discussed on its probable causes. The most effective method of prevention is to dry the paddy field for abut 10 days just before the plant forms panicle primordia.
