Biochar Chemistry in a Weathered Tropical Soil: Kinetics of Phosphorus Sorption

Marina Moura Morales, Nicholas Brian Comerford, Maurel Behling, Daniel Carneiro de Abreu and Iraê Amaral Guerrini
Additional contact information
Marina Moura Morales: EMBRAPA Florestas, Estrada da Ribeira, km 111, Colombo 83.411-000, PR, Brazil
Nicholas Brian Comerford: College of Tropical Agriculture and Human Resources, University of Hawai ‘i, 3050 Maile Way, Honolulu, HI 96822, USA
Maurel Behling: EMBRAPA Agrossilvipastoril, Estrada dos Pioneiros, km 2.5, Sinop 785500-970, MT, Brazil
Daniel Carneiro de Abreu: AgriSciences, Instituto de Ciências Agrárias e Ambientais, Universidade Federal de Mato Grosso, Avenida Alexandre Ferronato, 1200, Sinop 78550-728, MT, Brazil
Iraê Amaral Guerrini: Departamento de Ciência Florestal, Solos e Ambiente, UNESP, Botucatu 18610-307, SP, Brazil

Agriculture, 2021, vol. 11, issue 4, 1-12

Abstract: The phosphorus (P) chemistry of biochar (BC)-amended soils is poorly understood. This statement is based on the lack of published research attempting a comprehensive characterization of biochar’s influence on P sorption. Therefore, this study addressed the kinetic limitations of these processes. This was accomplished using a fast pyrolysis biochar made from a mix of waste materials applied to a highly weathered Latossolo Vermelho distrofico (Oxisol) from São Paulo, Brazil. Standard method (batch method) was used. The sorption kinetic studies indicated that P sorption in both cases, soil (S) and soil-biochar (SBC), had a relatively fast initial reaction between 0 to 5 min. This may have happened because adding biochar to the soil decreased P sorption capacity compared to the mineral soil alone. Presumably, this is a result of: (i) Inorganic phosphorus desorbed from biochar was resorbed onto the mineral soil; (ii) charcoal particles physically covered P sorption locations on soil; or (iii) the pH increased when BC was added SBC and the soil surface became more negatively charged, thus increasing anion repulsion and decreasing P sorption.

Keywords: fast pyrolysis; batch method; P retention (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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