DESIGN AND EXPERIMENT OF A PEANUT SEEDING DEVICE FOR SYNCHRONOUS HOLE FERTILIZATION AND DIRECTLY-ABOVE SEEDING

To improve the utilization rate of fertilizers by peanut seeds, this paper aims at the synchronous hole fertilization and directly-above seeding of peanuts and designs a pneumatic horizontal disc hole fertilization device. A theoretical analysis of the ditching process of the fertilization furrow opener was carried out, and the height of the hole fertilization device from the ground was determined to be 40 mm. Through the analysis of the hole fertilization and directly-above seeding operation process, the time difference between seed metering and fertilizer metering was determined. Combining with theoretical analysis, EDEM - FLUENT coupling simulation tests and field tests were carried out on the device. The field test results show that the error of the fertilization hole spacing is 2.3% - 4.5%, the error of the hole fertilization depth is 3.2% - 5.1%, the seed - fertilizer distance is 64.8 mm - 67.2 mm, and the fertilizer distribution length is 99.3 mm - 107.5 mm. The test results meet the requirements specified in the sowing and fertilization standards.