Compost rate (t・ha⁻¹)

Pb mg・kg⁻¹

Cu mg・kg⁻¹

Zn mg・kg⁻¹

Ni mg・kg⁻¹

0.0

0.24^a

1.22^a

11.52^a

2.23^a

34.7

0.89^b

2.01^a

11.93^a

2.26^a

56.6

0.91^b

2.00^a

12.87^a

2.49^a

74.1

1.04^b

5.51^b

18.73^b

2.70 ^a

Mean

0.77

2.69

13.76

2.42

Maximum permissible levels (mg・kg⁻¹)

5

40

99.4

40

l.s.d

0.16

1.15

2.52

0.54

cv (%)

10.13

21.50

9.20

11.2

p-value

<0.001

<0.001

0.001

0.216