Effects of N, P and K fertilizer on antioxidant activities of mulberry leaves

• Gang LIU, 
• Hao YIN, 
• Gai-qun HUANG, 
• Jian-hua ZHANG, 
• Yong-qun ZHU, 
• Ling WEI, 
• Wan-hong TONG, 
• Chao-wen LIN