Abstract
An artempt was made to increase the Lascorbic acid content in the tops of head lettuce (crisp head and butter head types) by changing the general culture solution to a highly concentrated solution of L-ascorbic acid immediately before harvest. During the soaking treatment with a 1, 000ppm solution of L-ascorbic acid or its sodium salt, the L-ascorbic acid content in the head lettuce tops was at least 4 times higher than that of the control. It was found that much of the absorbed L-ascorbic acid moved to the top and accumulated there. These results suggest that this culture technique may be able to produce leaf vegetables containing abundant L-ascorbic acid.
