著者

小野田 元 小野田 晃夫 下田 勉 小野田 憲 岩野 鐵夫 長崎 泰一 千葉 末作

出版者

Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists

雑誌

生物環境調節 (ISSN:05824087)

巻号頁・発行日

vol.37, no.2, pp.159-163, 1999-06-30 (Released:2010-06-22)

参考文献数

4

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We evaluated the nutrient solutions to establish high-yielding hydroponics of paddy rice. Takatsuji-type and Otsuka-type nutrient solutions which contained NH4-N, were more effective for vigorous growth with satisfactory plant length and tillers in early growth stages. In the case of Hyponica-Si- and Hyponica-type nutrient solutions, early growth was delayed slightly but it restored in the latter growth stages. From July when the NH4-N concentration in the nutrient solution rose, plants grown in Takatsuji-type, Otsuka-type and Kimura-A-type nutrient solutions exhibited yellow-brownish leaf streak symptom with long leaf blades and wide spreading of tillers. The onset of the symptom was related to the low CaO concentration in these nutrient solutions.