Effects of Chemical Fertilizer Reduction Combined with Biochar on the Content of Related Substances and Enzyme Activity of NO Synthesis and AsA-GSH Cycle in Tobacco Leaves

• LI Yu, 
• FAN Zhiwei, 
• XU Shengguang, 
• MA Huanjin, 
• CHEN Zebin, 
• HONG Yongzhong, 
• DU Lundan, 
• ZHANG Jinwen