Table 4.
Benefit–cost ratios (BCR), net present values (NPV), and marginal rates of return (MRR) in intercropping, with and without fertilizer.
| Country | Treatment | BCR | MRR | NPV-5 Year |
|---|---|---|---|---|
| Mozambique | Intercrop-Unfertilized | 0.7 (0.3–1.2) * | NA | −301.1 (−796.3–194.1) |
| Intercrop + Full | 1.1 (1.0–1.3) * | 38.7 § | 377.3 (−6.7–761.2) | |
| Intercrop + Half | 1.4 (1.2–1.5) | 145.2 | 733.5 (338.2–1128.8) | |
| Sole maize + Full | 0.7 (0.6–0.8) * | 33.7 § | −937.7 (−1092.7–−782.6) | |
| Tanzania | Intercrop-Unfertilized | 1.1 (1.0–1.1) * | NA | 67.2 (−55.5–189.9) |
| Intercrop + Full | 1.5 (1.4–1.6) | 177.7 | 1018.9 (906.9–1130.9) | |
| Sole maize + Full | 1.4 (1.3–1.4) | 290.2 | 574.4 (488.8–659.9) | |
| Kenya | Intercrop-Unfertilized | 1.3 (0.9–1.6) * | NA | 593.3 (−156.1–1342.6) |
| Intercrop + Full | 1.4 (1.2–1.7) | 82.1 | 1192.3 (491.8–1892.9) | |
| Intercrop + Half | 1.4 (1.1–1.7) | 116.5 | 1019.7 (350.6–1688.8) |
The figures in parenthesis are 95% confidence limits.
*
When the 95% confidence limit encompasses 1, BCR is not significantly different from 1, and thus the intervention is unprofitable. NA = not applicable. § MRR is below the threshold of 50%.