Effects of Increasing Organic Fertilizer Application on the Growth, Photosynthetic Characteristics, and Saponin Content of Panax notoginseng

• ZHANG Wangshun, 
• HONG Jie, 
• RAO Dajiang, 
• YANG Jing, 
• ZHANG Juqiang, 
• ZHANG Jinyan, 
• CHEN Junwen, 
• CUN Zhu