Table 4 Selected plant nutrients (g/kg) in the biochar and ashes (Mean ± standard deviations of triplicate values, nd = not determined)

From: Evaluation of Biochar Post‐Process Treatments to Produce Soil Enhancers and Phosphorus Fertilizers at a Single Plant

Sample Fe K Mg P Zn
Sewage sludge 76.22 ± 4.14 5.01 ± 0.04 5.17 ± 0.02 32.92 ± 0 0.52 ± 0.22
Biochar 118.05 ± 0.96 8.79 ± 0.27 9.11 ± 0.76 54.20 ± 2.18 1.12 ± 0.04
Oxidation ash 130.27 ± 5.06 12.23 ± 0.44 13.61 ± 0.19 70.68 ± 3.91 1.99 ±0.07
Gasification ash 132.58 ± 11.21 12.39 ± 0.05 14.00 ± 0.11 63.29 ± 3.90 2.01 ± 0.03
Biogas fiber 3.03 ± 0.04 11.50 ± 0.42 13.43 ± 0.20 22.45 ± 1.63 0.29 ± 0.001
Biochar 7.22 ± 0.05 26.82 ± 0.81 46.76 ± 2.25 67.95 ± 1.78 0.76 ± 0.03
Oxidation ash 12.74 ± 0.44 47.80 ± 1.28 76.10 ± 2.74 113.40 ± 2.15 nd
Gasification ash 12.72 ± 0.22 41.60 ± 0.28 71.40 ± 1.24 106.20 ± 0.60 1.21 ± 0.01
Cattle manure 1.19 ± 0.22 10.20 ± 1.33 3.60 ± 0.34 4.00 ± 0.39 0.12 ± 0.01
Biochar 2.74 ± 0.08 24.30 ± 0.27 11.60 ± 0.12 11.70 ± 0.09 0.34 ± 0.01
Oxidation ash 6.54 ± 0.17 72.00 ± 2.59 32.00 ± 0.80 52.40 ± 2.34 nd
Gasification ash 8.93 ± 1.07 73.60 ± 2.96 37.80 ± 1.95 38.90 ± 2.01 1.22 ± 0.05
Poultry manure 2.20 ± 1.29 23.60 ± 0.52 8.10 ± 1.13 26.20 ±1.57 0.46 ± 0.02
Biochar 4.06 ± 2.34 43.60 ± 4.72 11.60 ± 1.14 40.50 ± 4.18 0.89 ± 0.11
Oxidation ash 8.34 ± 0.31 62.20 ± 1.15 27.80 ± 1.71 57.20 ± 0.03 0.78 ± 0.01
Gasification ash 7.49 ± 0.28 72.20 ± 0.16 22.20 ± 0.57 72.30 ± 1.54 0.85 ±0.08
Woodchips 0.27 ± 0.20 0.58 ± 0 0.12 ± 0.02 0.19 ± 0.09 0.01 ± 0
Biochar 0.18 ± 0.04 2.52 ± 0.02 0.56 ± 0 0.30 ± 0.02 0.05 ± 0
Oxidation ash 6.28 ± 0.16 78.98 ± 0.68 18.29 ± 0.12 11.27 ± 0.39 0.81 ± 0.03
Gasification ash 29.01 ± 2.84 59.71 ± 3.90 20.02 ± 0.48 10.25 ± 0.39 0.80 ± 0.01
Wheat straw 1.77 ± 0.16 10.20 ± 0.09 1.40 ± 0.16 2.00 ± 0.18 0.35 ± 0.04
Biochar 0.23 ± 0.03 36.00 ± 0.40 2.30 ± 0.03 4.20 ± 0.06 0.15 ± 0.01
Oxidation ash 2.96 ± 0 193.70 ± 2.06 11.80 ± 0.25 22.00 ± 0.51 nd
Gasification ash 2.28 ± 0.17 173.00 ± 3.73 11.50 ± 0.23 20.70 ± 0.33 0.16 ± 0.01