Cover crop species

Cu rate (mg kg⁻¹)

Average

0

5

10

20

1. Crotalaria (Smooth crotalaria)

9.67de

10.67c

9.33c

15.33ab

11.25ef

2. Crotalaria (Showy Crotalaria)

10.33cde

8.33d

15.67ab

14.00abc

12.08de

3. Calopogonio (Calapo)

8.00e

7.67d

14.33b

12.33cd

10.58f

4. Pueraria (Tropical Kudzu)

11.66bcd

12.33abc

13.33b

12.33cd

12.41cde

5. Pigeonpea (black)

11.00cd

12.33abc

13.00b

12.33cd

12.17de

6. Lablab

10.33cde

12.00bc

15.00ab

13.67bcd

12.75cd

7. Black velvet bean

15.00a

14.00ab

14.00b

11.33d

13.58bc

8. Gray velvet bean (Bengal bean)

13.67ab

14.33a

18.33a

15.33ab

15.41a

9 Jack bean

12.67abc

11.33c

16.00ab

16.33a

14.08b

Average

11.37b

11.44b

14.33a

13.67a

F-Test

Copper rate (Cu)

**

Cover crop species (C)

**

Cu X C

**

CVCu(%)

7.79

CVC(%)

7.32