Abstract:
The seedlings of hemp were treated with six kinds of mixed salts composed of NaCl,Na2SO4,Na2CO3 and NaHCO3 at various proportions and differing in pH values.The indicators of morphological growth and physiology were determined to study the effects of different mixed salts on hemp seedlings growth.The results showed that plant height,aboveground dry weight and root length were significantly lower than the control group by the increase of pH,however,root shoot ratios and aboveground water content were significantly higher than that of the control group.SOD activity and MDA content sharply increased,soluble sugar content was increased then decreased,but chlorophy content significantly decreased and the content of ‘Bamahuoma’ was evidently higher than ‘Yunma No.5’.Hemp damage degree along with the increase of pH stress significantly increased.The results of PCA (principal component analysis) indicated that chlorophyll content,aboveground water content,and SOD activity could be used as the leading mixed indexes of salts resistance assessment in the seedling stage of hemp.The results for the cultivation of hemp and application provide a theoretical support.