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The inorganic nitrogenous amendments calcium cyanamide (CC), ammonia water (AW), and a mixture of ammonium bicarbonate with lime (A+L) are popularly used as fumigants to control soil-borne disease in China. However, it is unclear which of these fumigants is more effective in controlling  R. solanacearum . This present study compared the efficiencies of the three nitrogenous amendments listed above at four nitrogen levels in suppressing the survival of  R. solanacearum  in soil. The CC showed the best ability to suppress  R. solanacearum  due to its highest capacity to increase soiland NO 2  −  contents and pH. However, AW was more suitable to controlling bacterial wilt caused by  R. solanacearum  because it had a lower cost and its application rate of 0.25 g N kg −1  soil could effectively suppress the survival of  R. solanacearum . Additionally, soil microbial activity and community populations were restored to their initial state four weeks after the application of each fumigant, indicating that the three fumigants had few detrimental impacts on soil microbial activity and community structure with an exception of the suppression of  R. solanacearum . The present study provides guidance for the selection of a suitable alkaline nitrogenous amendment and its application rate in controlling bacterial wilt.

Effect of calcium cyanamide, ammonium bicarbonate and lime mixture and ammonia water on survival of Ralstonia solanacearum and microbial community