부산대학교 도서관

Root-zone fertilization (RZF) can improve fertilizer utilization, but the development progress of fertilizer point-applied technology is very slow due to lack of fertilizer point-applied device. In this work, a new type of fertilizer point-application device based on the mechanism of Geneva Drive is taken as the specific analysis object, the impacts of working speed, fertilizer discharging height and fertilizer discharging mass on the fertilizer particles distribution performance are explored by DEM-MBD simulation. Box-Behnken test optimization results show that when the working speed, fertilizer discharge height and fertilizer discharging mass of 3.66 km/h, 27 mm and 4.55 g, the fertilizer distribution length and coefficient of variation were 78.62 mm 7.58%, respectively. Based on the simulation results a fertilizer point-applied device was produced and field experiments were carried out at working speeds of 3.6, 4.5 and 5.4 km/h. The results showed fertilizer particle distribution lengths of 14.58 cm, 16.32 cm and 19.35 cm respectively. This paper can provide a mature mechanical device for fertilizer granule point-application agronomy and improve mechanization and operational quality.