Effects of Biochar Pyrolyzed at Different Temperatures on the Survival of Salmonella in Vegetable Soils
2020
Zhang, Taoxiang | Yu, Wei | Shi, Yuyu | Yang, Wenhao
Salmonella is a common zoonotic pathogen. Few studies have explored the effects of biochar on the survival of Salmonella in soil. Biochar made by pig manure at different temperatures were applied to four typical vegetable soils to investigate the survival dynamics of Salmonella. The results showed that the survival of Salmonella in latosol, red soil, and black soil was significantly promoted after biochar addition, but not in brown soil. The pyrolysis temperature of biochar had great effects on the survival of Salmonella. The survival time of Salmonella in the soil with biochar at 300°C was longer than that at 500 °C and 700 °C. The longest survival time of Salmonella was observed in Latosol with 300 °C biochar (111.36 days). Correlation analysis showed that soil pH, organic matter, and total nitrogen content were significantly positively correlated with the survival time of Salmonella in vegetable soils without biochar. However, the content of total potassium was the main controlling factor affecting the survival dynamics of Salmonella in soils with biochar.
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