To obtain a desirable effect in vegetables cultivation using chitin such as chitosan.SOLUTION: The present invention provides a method for producing vegetables with an enhanced content of vitamin, wherein in hydroponics of the vegetables, a hydroponic culture medium containing chitin of 0.005-0.05 mass% is applied to the vegetables as a fertilizer for at least 3 days.SELECTED DRAWING: Figure 3【課題】キトサン等のキチン質を用い、野菜栽培において、有益な効果を得る。【解決手段】野菜を水耕栽培するにあたり、キチン質を０．００５～０．０５質量％含有させた水耕用培養液で少なくとも３日間施肥することを特徴とするビタミンの含有量が増強された野菜の生産方法。【選択図】図３
