Effect of Different Previous Crops on the Nutrient Content, Enzyme Activity and Bacterial Community Structure in Tobacco Growing Soil

• Zhongkui LI, 
• Yaru DING, 
• Yinggang ZHOU, 
• Aifen LING, 
• Xiaoci LI, 
• Yulan CHEN, 
• Hongli LI, 
• Yan WANG