PROBLEM TO BE SOLVED: To provide means for growing rice plants while inhibiting elongation of their heights without changing a fertilizer application amount of three elements of fertilizer, thereby reducing falling down of the rice plants.SOLUTION: Focusing on magnesium chloride and utilizing diluent of seawater, provided is a method with which rice plants are grown with elongation of their heights inhibited, by adjusting magnesium ion concentration and chloride ion concentration of water for paddy rice cultivation. The water for paddy rice cultivation according to the present invention is an aqueous solution which contains magnesium chloride and in which magnesium ion concentration is adjusted within a range of 122-183 ppm, and chloride ion concentration within a range of 1889-2833 ppm.COPYRIGHT: (C)2016,JPO&INPIT【課題】肥料の三要素の施肥量を変更することなく、背丈の伸びを抑制して稲を生育させ、稲の倒伏を低減する手段を提供すること。【解決手段】塩化マグネシウムに着目し海水の希釈液を利用して水稲栽培用水のマグネシウムイオン濃度と塩化物イオン濃度とを調整することにより背丈の伸びを抑制しながら稲を生長させる。本発明に係る水稲栽培用水は、塩化マグネシウムを含む水溶液であって、マグネシウムイオン濃度を122~183ppm、塩化物イオン濃度を1889~2833ppmの範囲に調整したことを特徴とする。【選択図】図1
