Abstract:
Objective The aim was to clarify the effects and mechanisms of different soil conditioners on the yield of replanted Panax notoginseng (P. notoginseng), so as to screen out suitable soil conditioners for replanted P. notoginseng and provide theoretical guidance for developing new soil conditioners of P. notoginseng, thereby laying a foundation for further shortening the replanting interval of P. notoginseng.
Method The soils after dazomet fumigation were treated with three different soil conditioners: Japanese organic nova soil conditioner (Treatment A), quicklime (Treatment B), and composite mineral materials (Treatment C). A group without soil conditioner addition was set as the control (CK). The effects of different soil conditioners on the yield of replanted P. notoginseng were evaluated and the formation mechanism of yield was analyzed.
Result The composite mineral material could gently regulate soil pH value, increased soil enzyme activitiy and water content, alleviated nutrient imbalance, which effectively improved the physical and chemical properties of replanted P. notoginseng soil, and promoted the growth of P. notoginseng plants. Meanwhile, it promoted the enrichment of various beneficial bacteria including Burkholderia-Caballeronia-Paraburkholderia, Rhodanobacter, Bacillus and Trichoderma, and inhibited the reproduction of the main pathogenic bacteria of P. notoginseng root rot, such as Fusarium and Ilyonectria. The advantage of soil beneficial bacteria was obvious, which significantly reduced the incidence rate of P. notoginseng root rot, and ultimately achieved the yield increase of replanted P. notoginseng. In addition, the application of soil conditioners significantly reduced the contents of total ash and heavy metals, improved the quality of P. notoginseng.
Conclusion By comprehensively improving the problems of soil acidification, nutrient imbalance, and compaction in replanted P. notoginseng, it could promote the robust growth of P. notoginseng plants, while also helping to build a soil micro-environment dominated by beneficial microorganisms, thereby reduce the occurrence of root rot disease in P. notoginseng, and ultimately achieve yield in replanted P. notoginseng. The composite mineral material in this study has a good effect on improving the soil problem of replanting P. notoginseng, which can play a positive role in further shortening the replanting interval of P. notoginseng.
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