Abstract
The occurrence of bitter fruit in cucumber (Cucumis sativus L., cv. Kagafutokyuri) was higher in the plots with a lower air temperature (the early growing stage and the non-heating treatment) . Leaf weight was smaller in the plots with a lower air temperature. Total-N, amino acid-N and protein contents were higher or showed a tendency to be higher in the plots with a lower air temperature. Nitrate-N content was higher in the early growing stage than in the later one, while it was higher in the heating treatment than the non-heating.
