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Fig. 4 | Chemical and Biological Technologies in Agriculture

Fig. 4

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

Fig. 4

Effects of biochars derived from sewage sludge (SSB), olive pomace (OPB), chicken manure (CMB), and date palm residues (DRB) produced at 300 (3), 500 (5), or 700 (7) °C in comparison to a control treatment (CONT) on soil moderately labile inorganic (Pi) and organic P (Po)P fractions: A NaOH-Pi and B NaOH-Po. For a P fraction, treatments sharing the same letter are considered not significantly different based on Student–Newman–Keuls (SNK) test–LSD test (at P < 0.05). Errors bars represent standard error of treatment mean (n = 3)

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