PROBLEM TO BE SOLVED: To provide means for promoting elongation of heights of paddy rice plants, growing the rice plants, and allowing a lot of grains to bear in every ear by elongating the rice ears, without changing a fertilizer application amount of three elements of fertilizer.SOLUTION: Rice plants are grown while elongation of their heights are promoted, by adjusting direct reducing sugar concentration and citric acid concentration of water for paddy rice cultivation, utilizing Mirin. The water for paddy rice cultivation according to the present invention is an aqueous solution in which Mirin has been added to water, and direct reducing sugar concentration is adjusted within a range of 22-440 mg/100 mL and citric acid concentration within a range of 0.008-0.15 mg/100 mL.【課題】肥料の三要素の施肥量を変更することなく、水稲の背丈の伸びを促進して稲を生育させ、稲穂を長くして１つの穂に多くの籾を実らせる手段を提供すること。【解決手段】みりんを利用して水稲栽培用水の直接還元糖濃度とクエン酸濃度とを調整することにより背丈の伸びを促進しながら稲を生長させる。本発明に係る水稲栽培用水は、水にみりんを添加して直接還元糖濃度を２２～４４０ｍｇ／１００ｍＬ、クエン酸濃度を０．００８～０．１５ｍｇ／１００ｍＬの範囲に調整した水溶液であることを特徴とする。【選択図】図１
