Cover crop species | Cu rate (mg kg-1) | Average | |||
0 | 5 | 10 | 20 | ||
1. Crotalaria (Smooth crotalaria) | 0.56b | 0.50ab | 0.50b | 1.00a | 0.64a |
2. Crotalaria (Showy Crotalaria) | 0.53b | 0.53ab | 0.66b | 0.93a | 0.67a |
3. Calopogonio (Calapo) | 0.53b | 0.36b | 1.23a | 0.80a | 0.73a |
4. Pueraria (Tropical Kudzu) | 0.83a | 0.47ab | 0.77b | 0.73a | 0.70a |
5. Pigeonpea (black) | 0.53b | 0.47ab | 0.57b | 0.88a | 0.61a |
6. Lablab | 0.43b | 0.63a | 0.73b | 1.13a | 0.73a |
7. Black velvet bean | 0.60b | 0.63a | 0.70b | 0.70a | 0.66a |
8. Gray velvet bean (Bengal bean) | 0.50b | 0.60a | 0.77b | 0.93a | 0.70a |
9 Jack bean | 0.53b | 0.53ab | 0.83ab | 1.10s | 0.75a |
Average | 0.56c | 0.53c | 0.75b | 0.91a | |
F-Test | |||||
Copper rate (Cu) | ** | ||||
Cover crop species (C) | NS | ||||
Cu X C | ** | ||||
CVCu(%) | 18.12 | ||||
CVC(%) | 17.69 |