Suitability Evaluation and Influencing Factors of Soil Fertility in Tobacco Growing Areas of Huayuan County, Xiangxi Prefecture

• Ruiwen HU, 
• Juan LI, 
• Deming XIANG, 
• Qingming ZHOU, 
• Liming ZHANG, 
• Feng TIAN, 
• Maocheng TIAN, 
• Qiang LI