Desain bajak subsoil getar dengan pemupuk mekanis untuk budidaya tebu lahan kering

Abstract

This paper represent development process and the result of field test of the second prototipe of vibratory subsoiler. The prototipe is dual row subsoiler with spacing of 135 cm. This vibratory subsoiler is designed to reduce tillage draft and to improve pulverization of the tilled soil. Unlikethe conventional vibratory tillage, the shank of this developed vibratory subsoiler is maintain unvibrated. But the vibration is done though the subsoiler wing, which are attached in the left and the right side of the shank. This unique design is adopted in order to reduce the transmitted vibration of the tool to the body of the tractor. The source of forced vibration is contructed using four bar lingkage mechanism which is driven from tractor’s PTO. The amplitude of wing oscillation is between 6.5 to 7 cm. The prototipe could satisfy perform the desire operation. When it was tested using 70 hp tractor at university experimental farm in Bogor, the prototipe could reach average dept of 37 cm (between 35 to 38 cm) with average wheel slip of about 17.23 % when operated with vibration and had average wheel slip of about 32.8% when operated without vibration. Aplication of vibration of subsoller wings could reduce draft up to 30%. Average measured draft was 13.43 KN when vibrated and 17.46 kN when un vibrated. When it was tested using 140 hp tractor on ratoon-1 field during dry condition (August), the developed prototipe could reach tillage depth of 50 cm.