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Table 1 Chemical characterization of hot water extract of biochar produced from two different feedstocks combinations: pine wood: clay: sand (PCS-BC; 70:15:15) and wheat straw:bird manure (WB-BC; 50:50)

From: Fertilizing behavior of extract of organomineral-activated biochar: low-dose foliar application for promoting lettuce growth

Chemical properties

PCS-BC extract

WB-BC extract

CF-PCS

CF-WB

pH

8.9 ± 0.15

10.3 ± 0.05

8.9

10.3

Electrical conductivity (mS cm2)

0.06 ± 0.005

2.07 ± 0.24

Zn (mg l−1)

0.12 ± 0.06

0.25 ± 0.11

0.12

0.25

Fe (mg l−1)

1.31 ± 0.27

1.96 ± 0.25

1.31

1.96

Cu (mg l−1)

0.13 ± 0.007

0.15 ± 0.01

0.13

0.15

Ca (mg l−1)

2.8 ± 0.11

1.8 ± 0.04

2.80

1.8

Mg (mg l−1)

2.11 ± 0.44

1.73 ± 0.49

2.11

1.73

Na (mg l−1)

8 ± 0

347 ± 10.7

8.0

347

Cl (mg l−1)

15 ± 2.8

132 ± 1.7

1.5

1.1

K (mg l−1)

13.3 ± 1.3

522 ± 19.2

P (mg l−1)

0.58 ± 0.09

12.4 ± 0.66

Total N (mg l−1)

0.62 ± 0.12

1.1 ± 0.03

Inorganic C (mg l−1)

9.72 ± 0.1

65 ± 2.3

Dissolved organic C (mg l−1)

62.5

675

Hydrophobic organic carbon (mg l−1)

37.5

225

Chromatographable organic C (mg l−1)

25

450

Bio-polymers (mg l−1)

1.25

25

Humics (mg l−1)

3.75

200

Building blocks (mg l−1)

2.5

175

Low molecular weight neutrals (mg l−1)

11.25

50

  1. Values for PCS-BC and WB-BC extract represent mean ± SE of three replicates. Minor and trace element composition of PCS chemical fertilizer (CF-PCS) and WB chemical fertilizer (CF-WB) prepared to correspond PCS-BC extract and WB-BC extract, respectively