|Abstract:To deal with the different requirements of organic fertilizer in different growth stages of fruit orchards, this paper designed a kind of organic fertilizer application machine. On the basis of determining the physical properties of organic fertilizer (bulk density, angle of repose and loose degree), we used the discrete element simulation software EDEM to simulate the fertilizer export baffle rotation angle and the fertilizer rate, fitted the simulation results and obtained a linear relationship between the two. With the machine running speed, different plots of fertilizer demand, fertilizer and fertilizer flow mechanism of rotation angle and other factors, we designed the organic fertilizer deep applicator variable fertilization control system, including the main program module, speed measurement module (speed, fertilization rate, pulse conversion module), interrupt module and liquid crystal display module. The results of indoor experiment showed that when the fertilization was 7532.46 kg, 11042.28 kg and 9836.82 kg per hectare, the fertilizer variation coefficient of Cv were 1.1%, 1.3% and 1.9%, the results showed good consistency. The results of field experiment showed that the fertilizer was uniform and there was no-flow phenomenon. All the results meet the design requirements.