Table 1 Soil chemical parameters.

From: Long-term nitrogen fertilization decreased the abundance of inorganic phosphate solubilizing bacteria in an alkaline soil

Treatment

pH

CTol (g kg−1)

NTol (g kg−1)

NAmo (mg kg−1)

NNtr (mg kg−1)

PTol (g kg−1)

POsl (mg kg−1)

KTol (g kg−1)

N/P

Control

8.36 ± 0.03 a

10.055 ± 0.455 bc

0.763 ± 0.046 bc

0.43 ± 0.25 c

2.63 ± 0.17 c

0.526 ± 0.314 c

7.753 ± 2.702 d

9.27 ± 1.45 a

0.43 ± 0.07 b

NK

8.11 ± 0.07 c

8.525 ± 0.185 c

0.668 ± 0.078 c

2.33 ± 0.60 a

79.54 ± 32.39 a

0.178 ± 0.149 c

8.288 ± 5.980 d

8.37 ± 0.55 a

12.03 ± 3.09 a

NP

8.02 ± 0.02 cd

11.418 ± 0.419 b

0.908 ± 0.098 b

0.69 ± 0.69 bc

17.68 ± 8.51 c

2.185 ± 0.329 ab

30.171 ± 6.029 b

10.07 ± 1.08 a

0.65 ± 0.19 b

PK

8.26 ± 0.08 b

10.378 ± 0.731 bc

0.753 ± 0.052 bc

0.93 ± 0.46 bc

3.57 ± 1.54 c

2.726 ± 0.740 a

45.860 ± 4.409 a

9.61 ± 3.45 a

0.10 ± 0.02 b

NPK

8.03 ± 0.10 cd

10.305 ± 0.707 bc

0.845 ± 0.125 bc

1.31 ± 0.98 abc

44.55 ± 26.27 b

1.756 ± 0.602 b

23.599 ± 2.298 bc

9.18 ± 2.05 a

1.99 ± 0.60 b

OM

8.00 ± 0.03 d

13.465 ± 1.109 a

1.173 ± 0.055 a

2.48 ± 0.53 a

19.16 ± 6.19 bc

0.583 ± 0.137 c

21.673 ± 4.989 c

7.62 ± 1.64 a

1.08 ± 0.23 b

1/2OMN

8.09 ± 0.10 cd

11.405 ± 0.349 b

0.935 ± 0.061 b

1.88 ± 1.50 ab

19.26 ± 6.40 bc

0.826 ± 0.416 c

23.943 ± 6.971 bc

7.21 ± 1.69 a

0.92 ± 0.15 b

  1. Mean ± Standard Deviation (n = 4).
  2. Different letters within rows followed by indicate significance at P < 0.05.
  3. CTol: total carbon, NTol: total nitrogen, NAmo: ammonium nitrogen, NNtr: nitrate nitrogen, PTol: total phosphorus, POsl: available phosphorus, KTol: total potassium, N/P: the ratio of inorganic N (NAmo + NNtr) to POsl.
  4. Control: without fertilizer, NK: chemical nitrogen (N) and potassium (K) fertilizer, NP: chemical N and phosphorus (P) fertilizer, PK: chemical P and K fertilizer, NPK: chemical N, P and K fertilizer, OM: organic manures, 1/2OMN: half chemical NPK fertilizer plus half organic manure.
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