Effects of soil pH values regulated by different fertilization on the disease incidence and growth of Panax Notoginseng

The effects the pH of the soil on the growth and morbidity of Panax notoginseng were compared under different fertilization combination:CaMgP+ternary compound fertilizer+biofertilizer,quicklime+ternary compound fertilizer+biofertilizer,plant ash+ternary compound fertilizer+biofertilizer,ternary compound fertilizer+biofertilizer,biofertilizer) and no additional fertilizer.The results showed that combined application of CaMgP,quicklime,and plant ash respectively with ternary compound fertilizer increased the pH of soil significantly.The pH of soil with different fertilization had significant difference,which showed as follows:quicklime+ternary compound fertilizer+biofertilizer>plant ash+ternary compound fertilizer+biofertilizer>CaMgP+ternary compound fertilizer+biofertilizer>ternary compound fertilizer+biofertilizer>biofertilizer>no fertilizer(p<0.05).The emergence rate,surviving rate,plant height and leaf area index behaved as:plant ash+ternary compound fertilizer+biofertilizer>CaMgP+ternary compound fertilizer+biofertilizer>quicklime+ternary compound fertilizer+biofertilizer>ternary compound fertilizer+biofertilizer>biofertilizer>no fertilizer.Incidence of root rot had no significant difference among the following three combination:CaMgP+ternary compound fertilizer+biofertilizer,quicklime+ternary compound fertilizer+biofertilizer and plant ash+ternary compound fertilizer+biofertilizer fertilization,but were obviously lower than that of no fertilizer.The incidence of Panax notoginseng root rot and pH showed a significant negative correlation (p<0.05),especially from April to August.It could be seen that plant ash+ternary compound fertilizer+biofertilizer significantly improved the pH of sequential cropping soil of Panax notoginseng,promoted the growth of Panax notoginseng and reduced the incidence of root rot.