Cover crop species

Cu rate (mg kg⁻¹)

Average

0

5

10

20

1. Crotalaria (Smooth crotalaria)

0.67c

0.56d

0.82c

0.49c

0.63d

2. Crotalaria (Showy Crotalaria)

1.23c

1.29cd

1.73c

0.93c

1.30d

3. Calopogonio (Calapo)

1.12c

1.84cd

1.33c

1.26c

1.39d

4. Pueraria (Tropical Kudzu)

0.53c

0.49d

0.52c

0.47c

0.50d

5. Pigeonpea (black)

0.86c

1.47cd

1.01c

1.31c

1.16d

6. Lablab

4.45a

2.65bcd

4.21b

1.24c

3.13c

7. Black velvet bean

3.10b

4.91ab

6.04b

4.45b

4.62b

8. Gray velvet bean (Bengal bean)

2.80b

3.10bc

5.10b

5.09b

4.03bc

9 Jack bean

4.35a

6.72a

8.12a

9.74a

7.23a

Average

2.13b

2.56ab

3.21a

2.77ab

2.66

F-Test

Copper rate (Cu)

**

Cover crop species (C)

**

Cu X C

**

CVCu (%)

11.52

CVC (%)

7.28