Design of Edge-cell Type Metering Device
to Minimize Fertilizer Clogging
Annisa Nur Ichniarsyah*,1, Wawan Hermawan2 and Tineke Mandang2
1Department of Agroecotechnology, Trilogi University, Indonesia.
2Department of Mechanical and Biosystem Engineering, Bogor Agricultural University, Indonesia
A prototype of corn fertilizer applicator had been developed since 2009 (prototype-1).
However, the applicator did not work well due to fertilizer clogging (about 38%).
Prototype-2 metering device was then designed, developed, and tested to improve its
performance but the clogging was still high (31%). Therefore, prototype-3 was designed and developed to overcome the problem. The objective of the research was to design an edge-cell type metering device to minimize the clogging and to achieve higher accuracy. The edge-cell type metering device was optimally designed to minimize the friction between fertilizer and the rotor tips. Its diameter is 40 mm with 6 grooves and its length is 80 mm. For performance test, the hopper and a variable speed electric motor were attached to the metering device in a set of experiments in the laboratory. The tests included accuracy and uniformity test. The fertilizers used for the test were urea, TSP, and a mixture of TSP and KCl. Rotor rotation speed was 15, 25, and 35 RPM respectively and the volume of fertilizer in the hopper was 25, 50, and 100% respectively. The accuracy and uniformity test of prototype-3 showed satisfying results and the clogging was eliminated.
Keywords: Edge-cell type metering device, fertilizer applicator, fertilizer clogging, optimum design.
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