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Estimation of Nodule Index of nodules formed by cowpea plant grown in varying soil: compost mixtures under greenhouse condition at 28 ± 2°C for 9 weeks.
| Growing medium (%SMC) (Compost: Soil mixture) | Nodule size (mm) nodule index | Nodule weight (mg) nodule index |
|---|---|---|
| 0 | 2 | 4 |
| 5 | 18 | 18 |
| 10 | 12 | 12 |
| 15 | 8 | 8 |
| 20 | 8 | 8 |
| 25 | 4 | 4 |
| 30 | 4 | 2 |
| 100 | 0 | 0 |
Notes: Nodule Index = A × B × C ≤ 18 (after Rehab et al. 2002)
