Parameter optimization of the notched blade spiral fertilizer discharger for pineapple orchards based on DEM - Dun, Guoqiang; Sheng, Quanbao; Ji, Xinxin; Li, Hailiang; Ma, Chunyu; Li, Xinming; Sun, Haitian; Wang, Luhan; Ma, Chao; Yu, Zhenzhen; Wang, Hongxuan (Frontiers in Mechanical Engineering, 2025)