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Microbial dysbiosis together with nutrient imbalance cause the replant problem of upper six flue-cured tobacco in Central Henan

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Abstract

Replant problem in agriculture is popular and has restricted the development of tobacco industry. To identify the key soil factors affecting replant problem of tobacco, rhizosphere soils and flue-cured tobacco plants were sampled from continuous planting fields for 1 year (CK), 3 years (3a), 5 years (5a), and 7 years (7a). The pH value, nutrient, autotoxic compounds and microbial community in soils and the yield and quality (economic characters) of tobacco were determined. Then the correlations between soil factors and economic characters of tobacco were analyzed by Mantel test. Results showed that the economic characters, soil pH, organic matter (SOM), total nitrogen (TN), available potassium (AK), microelements (Ca, Mg and Fe), bacterial richness and diversity decreased significantly, total potassium (TK), total phosphorus (TP), available phosphorus (AP) changed unevenly, while autotoxic compounds, fungal diversity and richness increased under the long-term continuous cropping system. Mantel test showed that the economic characters always had the highest positive correlation with bacterial community. In addition, when continuous cropping for 3 years, there was a high positive correlation between economic characters and major elements content (R = 0.5649, P = 0.003). After continuous cropping for 3 years, there was a high positive correlation between the economic characters and soil major elements (5 years: R = 0.6195, P = 0.001; 7 years: R = 0.4761, P = 0.001), microelements (5 years: R = 0.7214, P = 0.001; 7 years: R = 0.6427, P = 0.001). Therefore, in Central Henan tobacco growing areas, bacterial community dysbiosis together with nutrient imbalance cause the replant problem. However, the accumulation of rhizosphere autotoxic compounds contributes less to the problem.

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Acknowledgements

This work was cofinanced by the National Natural Science Foundation of China (Grant No. 31971508). This work would like to thank China Tobacco Henan Industrial Co., Ltd. for sample support.

Funding

This study was funded by the National Natural Science Foundation of China (Grant Number 31971508).

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DR: Conceptualization, investigation, writing-original draft. PL: formal analysis, data curation. LZ: methodology, validation, supervision. YT: resources. HY: funding acquisition, writing-review & editing supervision.

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Correspondence to Hongyan Yu.

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Rao, D., Liu, P., Zou, L. et al. Microbial dysbiosis together with nutrient imbalance cause the replant problem of upper six flue-cured tobacco in Central Henan. J Plant Dis Prot 128, 1487–1500 (2021). https://doi.org/10.1007/s41348-021-00513-3

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  • DOI: https://doi.org/10.1007/s41348-021-00513-3

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