Menthol content in Japanese mint cultivated in soil and in a
deep flow technique (DFT) hydroponic system using different nutrient
formula [i.e. plant standard nutrient (JM1), plant standard nutrient
plus amino acid mixture (JM2), plant standard nutrient plus sulphur
compound (JM3) and plant standard nutrient plus a combination of
amino acid mixture and sulphur compound (JM4)]. Values represent
mean ± SE. Different letters within each species of mint indicate
significant differences at P = 0.05