Distribution of Available Zinc in Longshan Tobacco Growing Soil and Its Influencing Factors

• Liming ZHANG, 
• Fuwei ZHENG, 
• Hongbo MI, 
• Wenxing LIU, 
• Minghui TIAN, 
• Juan LI, 
• Jun TAN, 
• Deming XIANG, 
• Qiang LI