| Cover crop species/Copper levels | Cu (mg kg−1) | ||||
| Cu (0 mg kg−1) | 1.41d | ||||
| Cu (50 mg kg−1) | 6.51c | ||||
| Cu (10 mg kg−1) | 11.82b | ||||
| Cu (20 mg kg−1) | 22.61a | ||||
| 1. Crotalaria (Smooth crotalaria) | 11.00a | ||||
| 2. Crotalaria (Showy Crotalaria) | 10.35a | ||||
| 3. Calopogonio (Calapo) | 10.30a | ||||
| 4. Pueraria (Tropical Kudzu) | 10.41a | ||||
| 5. Pigeonpea (black) | 10.55a | ||||
| 6. Lablab | 10.83a | ||||
| 7. Black velvet bean | 9.88a | ||||
| 8. Gray velvet bean (Bengal bean) | 11.34a | ||||
| 9 Jack bean | 10.64a | ||||
| Average | |||||
| F-Test | |||||
| Copper rate (Cu) | ** | ||||
| Cover crop species (C) | NS | ||||
| Cu X C | NS | ||||
| CVCu(%) | 9.51 | ||||
| CVC(%) | 19.21 |