Table 7.
Equations for calculation of energy parameters.
| Energy types | Components/factors | Unit |
|---|---|---|
| Direct energy | Diesel + labour + tractor + electricity | (MJ ha−1) |
| Indirect energy | Machinery + fertilizers + pesticides + seeds | (MJ ha−1) |
| Renewable energy | Labour + tractor + seeds | (MJ ha−1) |
| Non-renewable energy | Machinery + diesel + electricity + chemical fertilizer + pesticides | (MJ ha−1) |
| Total energy input | Direct/renewable + indirect/non-renewable energy | (MJ ha−1) |
| Grain energy output | Energy in the harvested grain (grain) | (MJ ha−1) |
| Total energy output | Energy in the harvested total biomass (grain + straw) | (MJ ha−1) |
| Net energy | Total energy output—energy input | (MJ ha−1) |
| Energy use efficiency | Total energy output/energy input | (MJ MJ−1) |
| Energy productivity | Grain yield/energy input | (kg MJ−1) |