Allelopathic Effects of Cymbopogon citratus Aqueous Extract on Seed Germination and Growth of Flue-cured Tobacco

• CHEN Wei, 
• YANG Ying, 
• CHEN Xing, 
• ZHAO Yingliang, 
• ZHAO Mingfu, 
• ZHAO Yinhe, 
• PENG Sheng