Open Access
Table 1
Coefficients used to estimate initial capital investment and operating costs.
| Agricultural machinery/ process | Useful life (hours)* | Salvage value (%)** | Maintenance and repair (% price)*** |
Specific fuel consumption (gallons/hour) |
|---|---|---|---|---|
| 50 hp tractor | 16000 | 50 | 45 | 2.1 |
| 75 hp tractor | 16000 | 37 | 45 | 2.1 |
| 90 hp tractor | 16000 | 35 | 45 | 4.4 |
| 120 hp tractor | 16000 | 41 | 45 | 6.5 |
| Tillage | 2000–3000 | 17–44 | 58–74 | 4.3–5.8 |
| Weed eaters | 2000 | 31–35 | 44 | 1.4–3.6 |
| Fertilizers | 2000–3000 | 38–48 | 63 | 1.4–3.6 |
| Sprayers | 1200–2000 | 33–65 | 61 | 0.3–1.7 |
| FFB cutters | 1800 | 0 | 15 | 0.03 |
| FFB harvesters | 10000–14000 | 0 | 5 | 0.5–0.6 |
| Trenchers | 1500–2000 | 20–39 | 58 | 1.6–4.5 |
| Backhoe | 10.0000 | 28 | 45 | 1.6 |
*
Retrieved from Hunt (2008)
***
Retrieved from the American Society of Agricultural and Biological Engineers (ASABE) (Srivastava et al., 2006)
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