种植年限

N (g/kg)

P (g/kg)

N/P (g/kg)

2

28.47 ± 2.46a

3.17 ± 0.10a

8.99 ± 1.07a

5

25.43 ± 1.07ab

2.06 ± 0.04b

12.33 ± 0.72a

8

24.27 ± 1.46b

1.87 ± 0.05c

12.98 ± 0.82b