Cover crop species | Cu rate (mg kg−1) | Average | |||
0 | 5 | 10 | 20 | ||
1. Crotalaria (Smooth crotalaria) | 0.14d | 0.22e | 0.33c | 0.17d | 0.21e |
2. Crotalaria (Showy Crotalaria) | 0.31d | 0.45bcde | 0.45c | 0.40cd | 0.40e |
3. Calopogonio (Calapo) | 0.21d | 0.41cde | 0.25c | 0.31cd | 0.29e |
4. Pueraria (Tropical Kudzu) | 0.16d | 0.37de | 0.40c | 0.10d | 0.26e |
5. Pigeonpea (black) | 0.46cd | 0.81bcd | 0.96b | 0.83bc | 0.76d |
6. Lablab | 1.20ab | 0.60bcde | 1.01b | 0.48cd | 0.82cd |
7. Black velvet bean | 1.31a | 1.52a | 1.87a | 1.57a | 1.57a |
8. Gray velvet bean (Bengal bean) | 1.46a | 0.92bc | 1.29b | 1.44a | 1.28b |
9 Jack bean | 0.79bc | 0.97b | 1.15b | 1.24ab | 1.04c |
Average | 0.67b | 0.69b | 0.85a | 0.73b | 0.74 |
F-Test | |||||
Copper rate (Cu) | ** | ||||
Cover crop species (C) | ** | ||||
Cu X C | ** | ||||
CVCu (%) | 19.37 | ||||
CVC (%) | 22.23 |