Differences in height (a), leaf biomass (b) and volatile oil
content (c) of spearmint (SM) and Japanese mint (JM) cultivated in
soil and in a deep flow technique (DFT) hydroponic system using
different nutrient formula [i.e. plant standard nutrient (SM1 and JM1),
plant standard nutrient plus amino acid mixture (SM2 and JM2), plant
standard nutrient plus sulphur compound (SM3 and JM3) and plant
standard nutrient plus a combination of amino acid mixture and
sulphur compound (SM4 and JM4)]. Values represent mean ± SE.
Different letters within each species of mint indicate significant
differences at P = 0.05