Studies on the Ecological Characteristics of the Rice Plants Grown in Different Localities, Especially from the Standpoint of the Nutrio-physiological Character of the Plant : Preliminary Report. Studies of the Ecological Characteristics of the Rice Plants Grown in Different Localities from the South to the Nouth of Japan

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  • 水稲生育相, 特にその栄養生理的特性の地域性に就て : 水稲施肥技術体系確立への一資料(予報)
  • 水稲生育相,特にその栄養生理的特性の地域性に就て
  • スイトウ セイイクソウ , トクニ ソノ エイヨウ セイリ テキ トクセイ ノ チイキセイ ニ シュウテ

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We expressed an idea in which we supposed the possibility of the existence of ecological characteristics in the growth and the metabolism of the rice plant. Fortunately we were able to collect rice plants grown at eight Agricultural Experiment Stations located in all parts of Japan from the south to the north. Using these samples, some preliminary studies have been done to ascertain the reasonability to the idea stated above. The following results were obtained : (1) Almost the same yield of the grain is obtained throughout Japan from the south to the north, while the yield of the straw increases from the north to the south. (2) The local variations of the contents of nitrogen, phosphorus and potassium in the grain are very small, while the contents of these elements in the straw are high in the north and low in the south. (3) The local variations in the content of phosphorus in the straw are comparatively large compared with that of nitrogen and potassium. This seems to have some relation to the iron contents in the straw. Judging from the above results, it may be stated with confidence that our expectation on the possibility of the ecological characteristics in the growth and the metabolism of the rice plant is true. So, it is proposed to proceed the experiment along this line.

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