The Effect of Nitrogen and Silica Nutrition on Percentage of Sterility by Rice Plant

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  • Goto Eiji
    Hokkaido Kamikawa Agric. Exp. Stn.:(present addresses) Hokkaido Cent. Agric. Exp. Stn. Iwamizawa Branch Office
  • Igarasi Toshinari
    Hokkaido Kamikawa Agric. Exp. Stn.
  • Inatu Osamu
    Hokkaido Kamikawa Agric. Exp. Stn.:(present addresses) Kaihatuhiryou Hanbai, Co. Ltd.

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  • 稲体の窒素・ケイ酸栄養条件が不稔発生に及ぼす影響
  • トウタイ ノ チッソ ケイサン エイヨウ ジョウケン ガ フネン ハッセイ ニ オヨボス エイキョウ

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In order to understand the influences of nitrogen and silicate fertilizer application on anther length and percentage of the sterility of the rice plant, we investigated by field experiment in Hokkaido Kamikawa Agric. Exp. Stn. (Brown Lowland soil) and by air-conditioned room experiment. The results are summarized as follows. 1) Application of silicate fertilizer decreased percentage of sterility. Compared with basal application, topdressing of silicate fertilizer was more effective in increasing carbohydrate content and anther length, decreasing percentage of sterility. 2) The anther length was negatively correlated to percentage of sterility and was positively correlated to carbohydrate content in the rice plant. Similar regression curves were plotted between the field experiment and the air-conditioned room experiment. 3) Silicate content in rice plants was increased at the flag leaf stage by applying both basal and topdressing silicate fertilizer. Furthermore, silicate content was correlated to carbohydrate content. Nitrogen content was negatively correlated to carbohydrate content. 4) Protein content in polished rice was decreased by silicate fertilizer application.

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