Effects of nano-silicon on the growth and development of ginseng
With ginseng as experimental material,6 concentrations of silicon were set up:0(CK),0.03(T1),0.06(T2),0.09(T3),0.12(T4)and 0.15 g/L(T5)were used to explore the change trend of the influence of different silicon concentrations on the growth and development of ginseng.The results showed that different concentrations of silicon application had positive effects on leaf length,stem length,root length,leaf width,stem diameter,root diameter and biomass of ginseng.The optimal concentration of silicon application for promoting ginseng growth was 0.09 g/L.Silicon application had a positive effect on the improvement of photosynthetic capacity of ginseng.Intercellular CO2 concentration reached the maximum value under T2 treatment,which was 4.01%higher than that in CK.The stomatal conductance reached the maximum value under T3 treatment,which was 100%higher than that in CK.The net photosynthetic rate reached the maximum value under T3 treatment,which was 136.47%higher than that in CK.The transpiration rate reached the minimum value under T3 treatment,which was lower than that in CK by 27.54%.The overall resistance intensity of root,stem and leaf of ginseng could be enhanced by increasing the enzyme activity of active oxygen defense system(peroxidase content)and reducing the degree of cell damage(malondialdehyde content).Different concentration of silicon application increased and accumulated silicon content in ginseng.The optimal treatment of silicon application to enhance the absorption of ginseng silicon was 0.09 g/L.In terms of different parts,the distribution of ginseng silicon in topdressing treatment was leaf＞root＞stem.From the perspective of different periods,the end of the green fruit period and the beginning of the red fruit period may be the best period for ginseng to absorb silicon.In summary,the optimal silicon application amount of ginseng is 0.09 g/L.This experiment provides a practical basis for promoting the growth and development of ginseng and enhancing resistance,and provides a reference for the applied silicon concentration of ginseng in farmland cultivation.
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