Regulation of density and nitrogen fertilizer on physiological characteristics, yield, and quality of silage maize using a ridge-furrow rainfall harvesting system in Longdong Region, China

• LIU Guiyu, 
• ZHOU Daliang, 
• LIANG Huanhuan, 
• SHI Wei, 
• CHANG Shenghua, 
• JIA Qianmin, 
• HOU Fujiang