Table 5 Annual chemical fertilizers consumption before and after biogas plant installation
From: Cost-benefit Analysis and Financial Viability of Household Biogas Plant Investment in South Ethiopia
|  | Plant size | Category | Minimum | Maximum | Mean ± SD | t value | p value |
|---|---|---|---|---|---|---|---|
DAP used (kg) | 6 m3 | Before adoption | 75 | 250 | 185.24 ± 66.659 | 12.302 | 0.000a |
After adoption | 25 | 100 | 30.29 ± 17.972 | ||||
8 m3 | Before adoption | 100 | 275 | 198.57 ± 75.466 | 21.255 | 0.000a | |
After adoption | 37.5 | 125 | 38.45 ± 8.614 | ||||
Urea used (kg) | 6 m3 | Before adoption | 50 | 175 | 108.33 ± 53.334 | 19.636 | 0.000a |
After adoption | 6.25 | 75 | 17.68 ± 18.272 | ||||
8 m3 | Before adoption | 75 | 200 | 140.71 ± 49.669 | 21.458 | 0.000a | |
After adoption | 12.5 | 100 | 22.02 ± 124.608 |