Effects of chemical fertilizer reduction and application of organic manure on the yield and nutritive value of Zea mays and soil microbial activity

• BAI Xuechun, 
• ZHANG Junhong, 
• FENG Kuiliang, 
• WANG Tao, 
• XIA Yukang, 
• MA Chaoran, 
• LONG Mingxiu, 
• HE Shubin