Table 2 Soil characteristics of black pepper fields.

From: Different responses of rhizosphere and non-rhizosphere soil microbial communities to consecutive Piper nigrum L. monoculture

Soil sample

Consecutive monoculturing spans

OM (g/kg)

AN (mg/kg)

AP (mg/kg)

AK (mg/kg)

pH

Rhizosphere soil

12 y

21.64 ± 0.69 a

117.48 ± 3.46 bc

204.60 ± 14.63 c

206.85 ± 13.54 b

5.90 ± 0.62 ab

18 y

17.36 ± 0.57 b

126.93 ± 4.26 ab

342.87 ± 42.62 b

131.03 ± 9.11 cd

5.92 ± 0.20 a

28 y

15.59 ± 0.26 c

129.85 ± 2.30 a

462.18 ± 20.24 a

168.81 ± 9.07 bc

5.83 ± 0.24 ab

38 y

15.27 ± 0.40 c

131.03 ± 4.45 a

467.15 ± 17.87 a

141.37 ± 2.75 cd

5.35 ± 0.02 abc

Non-rhizosphere soil

12 y

14.61 ± 0.27 cd

107.96 ± 0.94 c

48.42 ± 4.01 d

253.06 ± 32.34 a

5.17 ± 0.18 bc

18 y

12.03 ± 0.24 ef

120.44 ± 7.62 ab

49.32 ± 0.70 d

118.32 ± 3.37 d

4.71 ± 0.12 c

28 y

13.48 ± 1.06 de

129.49 ± 3.44 a

48.20 ± 0.12 d

58.32 ± 1.41 e

4.75 ± 0.10 c

38 y

11.91 ± 0.29 f

128.25 ± 0.98 ab

48.36 ± 0.54 d

127.53 ± 9.83 d

4.64 ± 0.01 c

  1. “12y”, “18y”, “28y” and “38y” refers to the four consecutive monoculture spans of 12, 18, 28 and 38 years, respectively. Values are presented as means ± standard deviation (n = 3). Means followed by the same letter for a given factor are not significantly different (P < 0.05, Turkey’s HSD test).
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