Effects of different types of biochar on soil microorganism and rhizome diseases occurrence of flue-cured tobacco

LI Chengjiang1 LI Dafei2 ZHOU Guisu1 XU Long2 XU Tianyang2 ZHAO Zhengxiong

(1.College of Tobacco Science, Yunnan Agricultural University, Kunming, Yunnan, China 650201)
(2.Wenshan Tobacco Company, Yunnan Tobacco Company, Wenshan, Yunnan, China 663000)
【Knowledge Link】Granville wilt; black shank

【Abstract】A field experiment was carried out to study effects of rice husk biochar and wood biochar application, respectively on rhizosphere microorganisms, rhizome diseases occurrence, and leaf yield of flue-cured tobacco. The application of biochar significantly affected the amount of rhizosphere microorganisms and the use of carbon sources of flue-cured tobacco. In turn, as well as the occurrences of granville wilt and tobacco black shank, also the yield and output value of tobacco leaf, which varied with the types of biochar. The treatment of wood biochar significantly increased the number of bacteria at vigorous growth stage and actinomycete at mature stage in flue-cured tobacco by 11.7% and 12.8%, respectively, while the treatment of rice husk biochar significantly increased the number of fungus in both stages. Compared with the control, the application of biochar significantly reduced the number of Ralstonia solanacearm and Phytophthora parasitica var. nicotianac and the percentage to total microorganism. But rhizosphere microorganisms of flue-cured tobacco had the opposite effect on the carbon use ability in vigorous growing stage; before mature stage, phenolic acids and amines used by rhizosphere microorganisms were the lowest. The effect above, was more obvious in treatment of wood biochar than in treatment of rice husk biochar. Compared with control, the treatment of wood biochar decreased the incidence and disease index of granville wilt by 24.3% and 33.3%, and those of tobacco black shank decreased by 23.9% and 14.9%, while increased the output and output value by 4.7% and 21.1%. In rice husk biochar treatment, the incidence and disease index of granville wilt decreased by 18.1% and 23.9%, the incidence and disease index of tobacco black shank decreased by 15.9% and 6.0%, and the field and output value increased by 2.2% and 12.0%. In summary, the application of biochar can significantly impactive the situations of rhizosphere microorganisms of flue-cured tobacco and the utilization of different types of biochar, reducing the occurrence of granville wilt and black shank, and increasing the yield and output value of tobacco leaf. The effect of wood biochar is better.

【Keywords】 biochar; flue-cured tobacco; root-zone microorganisms; granville wilt; tobacco black shank; yield; output value;

【Funds】 the Science and Technology Project of Yunnan Tobacco Company (2016YN14)

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(Translated by CHEN T)

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This Article

ISSN:0496-3490

CN: 11-1809/S

Vol 45, No. 02, Pages 289-296

February 2019

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Abstract

  • 1 Materials and methods
  • 2 Results and analysis
  • 3 Discussion
  • 4 Conclusion
  • References