Effect of Several Soil Treatments on Seedling Growth and Root Rot Disease of Panax notoginsen

The increasing severe soil obstacle to continuous cropping on Panax notoginsen would lead to severe root rot diseases, which seriously debased the quality of P.notoginsen and restricted the development of P. notoginsen industry. The effect of 8 soil ecological management methods on promoting seedling growth and inhibiting root rot diseases occurrence of P. notoginsen were compared in this study, in order to find out a effective soil ecological management method which could control root rot diseases of soil obstacle to continuous cropping on P. notoginsen. The results showed that all these 8 methods have some effect on increasing the field emergence rates,the seedling survival percentages and the underground biomass as well as reducing the occurrence of root rot diseases, the effect of the field steam treatment was the best among these 8 methods, and then was the dazom treatment, the metam treatment, the Bordeaux mixtrure treatment, the plant ash treatment, the high-pressure steam treatment, the activated treatment, and the alcohol treatment respectively. Compared with the control group, the field emergence rates and seedling survival percentages of the field steam treatment increased by 18.0% and 51.75%,respectively; the underground biomass also increased significantly, the root fresh weight and root dry weight increased by 32.0% and 26.8% compared with the control group; the occurrence of root rot diseases significantly inhibited to 9% which decreased by 52.6% than the control group. The effect of all these treatments on some growth indexes were not significant, such as chlorophyll content, leaf area, stem thickness, plant height, fresh and root dry weight, etc. The conclusion is that the dazom treatment and the field steam treatment are better soil treatment methods; however,the field steam treatment is the most effective ecological method to conquer the soil obstacle to continuous cropping on P. notoginsen. Through using the field steam treatment, the soil structure, soil environment are improved and the pathogens in soil are killed, which would destroy the soil environment for root rot diseases occurrence to some extent. Therefore,the field steam treatment could conquer the soil obstacle to continuous cropping on P. notoginsen,and prolong the soil utilization time and achieve the aim of conquering soil obstacle to continuous cropping on P. notoginsen.