Abstract
The content and composition of free amino acids in cabbage grown under different cultivation conditions were examined. Irrespective of the growing season and with the amount of nitrogen fertilizer, glutamine always constituted about half of the total free amino acids. The free amino acid content in July was significantly higher than that in August, September or October. When the amount of applied nitrogen fertilizer was increased, the proportion of glutamine in the total free amino acids was also increased. It was found that the darker green leaves contained more free amino acids than the paler-colored leaves.
