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《Chinese Tobacco Science》 2015-06
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Study on the Inhibitory Effect of the Aqueous Extract of a Botanical Mixture on Tobacco Black Shank and Its Influence on Soil Characteristics

WANG Chuanji;WANG Shusheng;ZHAO Yang;YANG Yinju;WANG Ruoyan;Tobacco Research Institute, Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture,CAAS;  
Research was conducted to investigate the effects of an aqueous extract of a botanical mixture on soil characteristics and inhibition to black shank. The results showed that at the concentrations of 2.5, 5 and 10 mg/m L, the aqueous extract inhibited the growth of Phytophthora nicotianac and decreased disease incidence and disease index of black shank. The aqueous extract was able to improve cation exchange capacity and electrical conductivity of the soil, increase the contents of NH_4~+, NO_3~-, available P and available K in the soil, while decreased the content of organic matter. At the concentration of 2.5, 5 and 10 mg/m L the aqueous extract increased activity of urease, sucrase, and acid phosphatase. At 2.5 mg/m L the aqueous extract increased amounts of fungus and actinomycetes in the soil. We thus concluded that the plant aqueous extract can inhibit growth of black shank, improve the transformation of available nutrients in soil and improve the soil environment eventually.
【Fund】: 贵州省烟草公司遵义市公司项目“植物源复配剂对烤烟根际生态环境及其产质量的影响研究”(2013-6)
【CateGory Index】: S435.72
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