Effects of sugarcane residue biochar and P fertilizer on P availability and its fractions in a calcareous clay loam soil
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ORIGINAL ARTICLE
Effects of sugarcane residue biochar and P fertilizer on P availability and its fractions in a calcareous clay loam soil Mina Safian1 · Hamidreza Motaghian1 · Alireza Hosseinpur1 Received: 7 January 2020 / Accepted: 6 April 2020 © Shenyang Agricultural University 2020
Abstract Biochar has the potential to affect the cycle of phosphorus (P), but the underlying mechanisms of its effects remain poorly understood in calcareous soils. Our understanding of the effects of biochar is limited in calcareous soils during incubation. Therefore, this study was conducted to investigate how the availability and mineral fractions of P change after the addition of combined biochar and P fertilizer during incubation in calcareous soil. Sugarcane residue (raw SR) and biochar (400 °C for 2 h) were added to soils treated with 50 mg kg−1 of P, in the form of Ca(H2PO4)2·H2O, at 0.5 and 1% (w/w). The soils were incubated at 25 ± 1 °C for 120 days. Available P (Olsen P) contents and mineral P fractions were measured after various incubation times (7, 30, 90, and 120 days). Biochar addition remarkably increased the amount of available P when compared with the raw SR treatment and the control condition (P
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