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Table 2 Basic characteristics of the biochars used in the study

From: Effect of biochar addition on legacy phosphorus availability in long-term cultivated arid soil

Biochar pH EC (ds m−1) Total C (%) Total N (%) Total P (%) BET surface area (m2 g−1)
Feedstock Pyrolysis temperature (°C)
Sewage sludge 300 6.72 1.07 33.04 4.37 1.09 0.59
Sewage sludge 500 8.35 0.80 20.59 2.26 1.80 11.13
Sewage sludge 700 11.28 0.95 17.84 0.99 1.94 12.17
Olive mill pomace 300 8.71 3.25 65.8 1.66 0.28 2.60
Olive mill pomace 500 9.56 6.91 68.41 1.21 0.44 4.32
Olive mill pomace 700 9.63 7.63 65.9 1.24 0.50 9.28
Chicken manure 300 7.30 7.97 50.39 8.48 1.93 3.54
Chicken manure 500 10.37 12.60 48.44 3.90 3.36 5.77
Date palm residues 300 6.84 7.27 55.31 0.49 0.05 3.60
Date palm residues 500 8.62 6.76 66.54 0.39 0.06 142.94
Date palm residues 700 10.56 18.48 67.16 0.51 0.12 255.08
  1. EC electrical conductivity, BET Brunauer–Emmett–Teller surface area