The necessary dying of equipment of the addition which includes the special illuminant like the ultraviolet lamp and the like, the method of producing the hydroponics vegetable which raises the content of useful component such as nutrition component and eating quality component such as asukorubin acid, polyphenol and sugar is disclosed. Particular method being production method of the vegetable due to hydroponics, preceding the harvest of the said vegetable, features that you cultivate when it makes at least portion of the root the air disclose over specified period.紫外線ランプ等のような特別な光源を含む追加の設備の必要なしに、アスコルビン酸、ポリフェノール、糖等の栄養成分や食味成分等の有用成分の含有量を高めた水耕栽培野菜を生産する方法が開示されている。当該方法は、水耕栽培による野菜の生産方法であって、該野菜の収穫に先立って、所定期間にわたり根の少なくとも一部を空気に曝露させた状態で栽培することを特徴とする。
