Effects of Different Concentrations of Humic Acid on Growth and Physiological Characteristics of Rape Seedlings

doi:10.11924/j.issn.1000-6850.casb17020083

Abstract

Abstract: Hydroponic experiment were done to investigate the effects of humic acid on growth and physiological characteristics of crops at seedling stage, and the tested material is Cao221167.[Method]The experiment set up different concentrations of humic acid(0；1‰；2‰；3‰；4‰；5‰) to study the effects on the biomass, plant height, root characteristics, chlorophyll content, MDA content and antioxidant enzyme activity of rapeseed seedlings.[Result] The results showed: when the humic acid concentration was 1‰,the biomass of rape seedling was significantly affected(The dry weight and fresh weight of the shoots increased by 18% and 12.20% respectively, and the dry weight and fresh weight of the underground increased by 41.67% and 54.70% respectively). Added humic acid could significantly improve the root activity of rapeseed seedlings; when the concentration was 1 ‰,it can significantly promoted the root growth(root length, total root length and root surface area increased by 20.36%, 70.49% and 30.43% respectively compared with the control). In the range of 1 ‰ ~ 5 ‰, with the increased of humic acid concentration, the activity of antioxidant enzymes in rape cells decreased first and then increased, and the chlorophyll content increased first and then decreased. [Conclusion]So, a certain concentration of humic acid can promote the growth of rape,and 1 ‰ and 2 ‰ concentration of humic acid is the appropriate concentration of rape growth, and when the concentration is 3 ‰ ~ 5 ‰, it inhibits the growth of rape.

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