Effects of humic acid on the growth and quality of Citrus medica.

Effect of different concentrations of humic acid on the growth and quality of Citrus medica was studied.The results showed that the leaf area,chlorophyll content,soluble protein content and soluble sugar content in Citrus medica treated four times by 150 mg·L-1 humic acid were significantly higher than the treatment without humic acid and those at other concentrations.Meanwhile,better growth and quality was found in Citrus medica treated eight times by 100 mg·L-1 humic acid.It indicated that,Citrus medica which was treated four times by 150 mg·L-1 humic acid,showed higher vitality and stress tolerance.