‘Cover crop species | Cu rate (mg kg−1) | Average | |||
0 | 5 | 10 | 20 | ||
1. Crotalaria (Smooth crotalaria) | 4.15bcd | 6.16ab | 4.41ab | 5.95a | 5.17bc |
2. Crotalaria (Showy Crotalaria) | 6.45bc | 5.03bc | 4.88ab | 6.35a | 5.68b |
3. Calopogonio (Calapo) | 3.92cd | 3.37de | 4.43ab | 5.01ab | 4.18cd |
4. Pueraria (Tropical Kudzu) | 13.39a | 7.08a | 6.47a | 5.86a | 8.20a |
5. Pigeonpea (black) | 7.40b | 4.31cd | 4.55ab | 4.87ab | 5.28bc |
6. Lablab | 2.51d | 2.34ef | 2.60b | 2.65b | 2.52ef |
7. Black velvet bean | 3.60cd | 3.35de | 2.90b | 4.33ab | 3.54de |
8. Gray velvet bean (Bengal bean) | 4.61bcd | 3.10def | 3.32b | 3.96ab | 3.74de |
9 Jack bean | 2.38d | 1.95f | 2.55b | 2.09b | 2.24f |
Average | 5.38a | 4.07b | 4.01b | 4.56ab | 5.38 |
F-Test | |||||
Copper rate (Cu) | ** | ||||
Cover crop species (C) | ** | ||||
Cu X C | ** | ||||
CVCu(%) | 23.95 | ||||
CVC(%) | 21.24 |