Sampling time

Treatment

Total organic C (g・kg^?1)

Total N (g・kg^?1)

C/N

1981

Initial

5.93 e

0.78 e

7.6

2014

CK

8.65 ± 0.08 d

1.08 ± 0.01 d

8.0

NPK

11.60 ± 0.26 c

1.37 ± 0.01 c

8.5

M

13.67 ± 0.32 b

1.79 ± 0.02 a

7.6

MNPK

13.27 ± 0.39 b

1.58 ± 0.03 b

8.4

hMNPK

15.87 ± 0.16 a

1.75 ± 0.02 a

9.1