Study on the Control Effect of Oyster Shell Powder on Tobacco Root-knot Nematode Disease
- Received Date: 23/06/2022
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Key words:
- oyster shell powder /
- root nematode disease /
- root vitality
Abstract: Root-knot nematode disease is a common soil-transmitted disease, which seriously restricts the improvement of the production quality of Chinese tobacco. In order to determine the optimal concentration of the natural active substance oyster shell powder on control of root-knot nematode disease, this study investigated the effect of different concentrations of oyster shell powder mixed soil on control of tobacco root-knot nematode disease and the effects on tobacco growth and root activity with pot experiment. The results showed that the control effect of oyster shell powder on root-knot nematode disease increased gradually with the increase of oyster shell powder dosage in the range of 0.05% to 0.5%. The treatment of 0.5% oyster shell powder mixed with soil had the best control effect on root-knot nematode disease, with 72.22% control effect and 11.79% increase in root activity, indicating a good growth promotion effect. The control effect of 0.3% oyster shell powder mixed soil on root-knot nematode disease was 66.67%, and the root activity was significantly increased by 28.45%, with the best growth promotion effect. Therefore, the application of natural active substance oyster shell powder can alleviate the occurrence of tobacco root knot nematode disease and promote the growth of flue-cured tobacco.