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Temperature of Pyrolysis (˚C)

350

450

550

650

EC (mS·m⁻¹)

SC⁽¹⁾

1.8

1.2 b⁽²⁾

1.4 b

2.0 b*⁽³⁾

1.9 b*

y = 0.3025 + 0.0027x

(r² = 0.797; p = 0.0003)

RH

0.8

0.2 a

0.2 a

0.3 a

0.3 a

ns⁽⁴⁾

PL

11.4

4.4 c

3.9 c

3.8 c

4.0 c

y = 8.4609 − 0.0174x + 1.6 × 10⁻⁵x²

(r² = 0.997; p = 0.0334)

SD

0.4

0.1 a

0.1 a

0.1 a

0.1 a

ns

pH

SC

7.8

8.7 d*

8.8 c*

9.1 c*

9.2 c*

y = 8.0200 + 0.0018x

(r² = 0.907; p < 0.0001)

RH

6.1

8.4 c*

8.3 b*

8.7 b*

8.7 b*

y = 7.9275 + 0.0012x

(r² = 0.617; p < 0.0001)

PL

7.3

8.2 b*

9.8 d*

9.8 d*

9.9 d*

y = −1.5314 + 0.0404x − 3.5 × 10⁻⁵x²

(r² = 0.931; p < 0.0001)

SD

4.0

7.6 a*

7.0 a*

7.4 a*

7.5 a*

y = 11.2748 − 0.0164x − 1.6 × 10⁻⁵x²

(r² = 0.625; p < 0.0001)

CEC (mmol_c·kg⁻¹)

SC

190

280 bc

200 c

166 b

169 b

y = 878.896 − 2.436x − 0.0021x²

(r² = 1.00; p = 0.0425)

RH

77

158 a

166 ab

171 b

165 ab

ns

PL

597

320 c*

203 c*

106 b*

105 ab*

y = 533.6833 − 0.6604x

(r² = 0.929; p < 0.0001)

SD

303

207 ab

113 a*

86 a*

91 a*

y = 901.9854 − 2.8627x − 0.0025x²

(r² = 0.994; p = 0.0160)