Changes in phosphorus fractions in three tropical soils amended with corn cob and rice husk biochars

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  • Joseph Osafo Eduah, University of Ghana, Københavns Universitet
  • ,
  • Eric Kwesi Nartey, University of Ghana
  • ,
  • Mark Kofi Abekoe, University of Ghana
  • ,
  • Mathias Neumann Andersen

The formation of phosphorus (P) compounds including iron-P, aluminum-P and calcium-P in highly weathered tropical soils can be altered upon biochar addition. We investigated the effect of corn cob biochar (CC) and rice husk biochar (RH) pyrolyzed at three temperatures (300°C, 450°C and 650°C) on phosphorus (P) fractions of three contrasting soils. A 90d incubation study was conducted by mixing biochar with soil at a rate of 1% w/w and at 70% field capacity. Sequential P fraction was performed on biochar, soil and soil-biochar mixtures. Increase in most labile P (resin-Pi, NaHCO3-Pi) and organic P fraction (NaHCO3-Po + NaOH-Po) in CC and RH biochars were inversely related to increasing temperature. HCl-Pi and residual P increased with increasing temperature. Interaction of CC and RH with soils resulted in an increase in most labile P as well as moderately labile P (NaOH-Pi) fractions in the soils. CC increased most labile P in the soils more than RH. The increase in most labile P fraction in soils was more significant at relatively lower temperatures (300°C and 450°C) than 650°C. However, the increase in HCl-Pi and residual P of the soils was more predominant at high temperature (650°C). The study suggested that biochar pyrolyzed at 300–450°C could be used to increase P bioavailability in tropical soils.

OriginalsprogEngelsk
TidsskriftCommunications in Soil Science and Plant Analysis
Vol/bind51
Nummer10
Sider (fra-til)1331-1340
Antal sider10
ISSN0010-3624
DOI
StatusUdgivet - 2020

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