Effects of Humic Acids Produced by Different Process on Wheat Growth under NaCl Stress
In order to research the effects of humic acids produced by three processes(supernatant lignite humic acid,original lignite humic acid,and fermented lignite humic acid)on wheat growth under NaCl stress,five treatments were set up in this study.They were five groups,i.e.,clear water(T1),150 mmol/L NaCl solution(T2),T2+supernatant lignite humic acid solution(T3),T2+original lignite humic acid solution(T4),and T2+fermented lignite humic acid solution(T5).The results showed that compared with T1,NaCl stress treatment T2,T3,T4 and T5 all inhibited wheat seed germination and plant growth with varied degrees.Under the stress of 150 mmol/L NaCl solution(T2),the relative conductivity and MDA content of wheat leaves and roots were significantly decreased by adding humic acid prepared by three different processes,and T3 treatment decreased by 22.31％,29.11％and 18.70％,and T5 treatment decreased by 38.41％,39.29％and 21.76％,respectively;The three kinds of humic acid could improve the germination potential,germination rate,germination index,root length,plant height,soluble sugar content,soluble protein content,as well as POD,CAT and SOD activities of wheat.Among them,T3 treatment exhibited the best effect on germination potential,germination rate and germination index,which were significantly increased by 23.25％,28.97％and 44.04％,respectively;T5 treatment showed the best effects on soluble sugar content,soluble protein content,POD,CAT and SOD activities,which were significantly increased by 37.58％,21.09％,37.63％,35.21％and 101.44％,respectively;There was no significant difference in root length and plant height.In summary,the supernatant lignite humic acid had a significant effect on promoting wheat germination,while the fermented lignite humic acid had the best effect on promoting wheat seedling growth and antioxidant capacity.
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