Abstract: Zhongyan 100,NC297 and KRK26 were selected as test materials to study the soil microorganism and enzyme activity in root-zone of different flue-cured tobaccogenotypes. The results showed that the amounts of root-zone soil microphyte,epiphyte,actinomyces and phosphate-dissolving bacteria had the similar changes along with thegrowth stages,but the amounts of epiphyte and phosphate-dissolving bacteria at squaring and harvest stages were significantly higher in root-zone of KRK26 than in Zhongyan 100 and NC297. The amounts of root-zone soil po-tassium-dissolving bacteria,nitrobacteria and celluose-decomposing bacteria changed differently in different flue-cured tobaccogenotypes. The amount of potassoium-dissolving bacteria in Zhongyan 100 ascended first,and then de-scended,reaching to the highest(53. 36×104cell/g of dry soil)at squaring stage. The amount of root-zone soil nitro-bacteria in NC297 reached to the highest at rosette stage,and then decreasedgradually,while in Zhongyan 100,it ascended first,and then descended,reaching to the highest at squaring stage. During the wholegrowth period,the a-mount of root-zone soil celluose-decomposing bacteria was higher in Zhongyan 100 than in KRK26 and NC297,and the root-zone soil catalase activity was the lowest in NC297,while the root-zone soil sucrase activity was the highest in Zhongyan 100.It was concluded that the root-zone soil microorganism amounts and enzyme activities were differ-ent in different flue-cured tobaccogenotypes.

Key words: Flue-cured tobacco, Genotype, Soil microorganism, Soil enzymes activity

CLC Number: 

• S572. 01