A soil fumigant increases American ginseng ( Panax quinquefolius L.) survival and growth under continuous cropping by affecting soil microbiome assembly: a 4-year in situ field experiment

作者：Na Peng, Y. Bi, Xiaolin Jiao, Ximei Zhang, Junfei Li, Yi Wang, Shanshan Yang, Ziqi Liu, Weiwei Gao · 发表于：Microbiology Spectrum · 年份：2023 · DOI：10.1128/spectrum.01757-23 · 被引用次数：10 · 研究领域：Ginseng Biological Effects and Applications、Plant Disease Management Techniques、Irrigation Practices and Water Management

ABSTRACT The replant problem is a widespread challenge in agricultural production and results in significant financial losses. The survival and development of American ginseng ( Panax quinquefolius L.), a well-known perennial medicinal plant, also typically suffer from replant problems. At present, efficient strategies for this issue and the underlying mechanisms are still lacking. Here, a series of in situ field experiments over a 4-year period were conducted to investigate the effectiveness and possible mechanisms of soil fumigation and fungicide in improving American ginseng survival under continuous cropping. During the 4-year ginseng cultivation, the seedling emergence rates in the dazomet fumigation-treated group (DF) decreased from 90.67% to 52.92%, from 78.67% to 0% in the lime sulfur fungicide-treated group (LS), and from 66.67% to 0% in the control. The fresh root weight in DF increased from 0.36 to 28.72 g, from 0.32 to 13.74 g in LS, and from 0.42 to 9.06 g in the control for the first 2 years. However, no ginseng survived during the following 2 years. Moreover, DF significantly decreased root rot disease incidence by 55.55% compared to LS-treated soil and 69.39% compared to non-treated soil. The correlation analysis results showed that both diversity and structure indices of bacteria and fungi were significantly correlated with root biomass and disease incidence in the second year. In summary, DF has presented a significant beneficial effect on American ginseng d...