Abstract
The usage of rice straw as an alternative basic compost fertilizer is needed. Rice straw processing into compost fertilizer through stage chopper. Chopper is the size reducing stage that it is easily decomposed. The chopper processing can be done by using straw chop machine. This research aims for performance test and economic analysis. Research use descriptive analysis. The results of performance test of straw chop machine have actual capacity is 103.32±12.068 kg/h, engine efficiency is 79.59%, power requirement with load and without load are 1.1±0.067 HP and 0.698±0.109 HP, specific load 7.94 W/kg, chopper yield is 94.33±0.97%, the percentage of chopper chunks is 83.55±0.04%, engine noise level 76.6±0.5 dB, and vibration level on the framework, hopper and chopper cylinder are 18±4.9 mm/s2, 53.94±1.3 mm/s2 and 21.6±4.6 mm/s2. Based on the result of economic analysis of rice straw chop machine have the basic cost is Rp.46,159,621.- with gross income Rp.55,792,800.-/year. The breakeven point has been reached when the machine has chopped 41,078 kg of rice straw. This rice straw chopper machine has met the economic feasibility criteria of NPV>0 that is Rp.52,821,891. BC Ratio>1 with value is 1.17. IRR value> MARR interest rate (9%) with IRR 102%.
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