Table 9.
Summary information on net present value (NPV), internal rate of return (IRR) and the payback period (PP) for the seven CSA practices studied.
| CSA practice | The probability distribution of Net Present Value |
Internal rate of return (IRR) |
Payback period (Years |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Mean NPV (in US$) |
90% confidence interval (US$) |
Mean (%) | 90% confidence interval |
Mean | 90% confidence interval |
|||||
| min | max | min | max | min | max | |||||
| Crop rotation | 2,646.00 | 842 | 4,589 | 70.69 | 41 | 110 | 1.0 | 1.70 | 2.30 | |
| Mixed cropping | 364.35 | 147 | 594 | 62.56 | 46 | 82.7 | 1.0 | 1.90 | 2.10 | |
| Minimum tillage | (3,958.00) | (4,734) | (-3348) | (287.00) | (274) | (299) | - | - | - | |
| Improved varieties | 1,372.37 | 935 | 1917 | 107.53 | 89 | 131 | 2.0 | 1.80 | 2.10 | |
| Improved Nutrient Management | 2,467.00 | 1,966 | 2,585 | 227.67 | 206 | 292 | 1.0 | 0.89 | 1.10 | |
| Supplementary feeding | 5,520.00 | 3,915 | 7,720 | 265.97 | 246 | 289 | 3.0 | 2.68 | 3.32 | |
| Improved livestock housing | 7,193.04 | 4906 | 10,167 | 120.13 | 101 | 142 | 2.0 | 1.89 | 2.10 | |
NB: The discount rate = 26%.