Changes in phosphorus fractions in three tropical soils amended with corn cob and rice husk biochars. Issue 10 (30th May 2020)

• Record Type: Journal Article
• Authors: Eduah, Joseph Osafo; Nartey, Eric Kwesi; Abekoe, Mark Kofi; Andersen, Mathias Neumann
• Is Part Of: Communications in soil science and plant analysis. Volume 51:Issue 10(2020)
• Page Start: 1331
• Page End: 1340
• Publication Date: 2020-05-30
• Subjects: Corn cob biochar -- phosphorus fractions -- pyrolysis temperature -- rice husk biochar -- soil; Soil science -- Periodicals; Plants -- Chemical analysis -- Periodicals; Agricultural chemistry -- Periodicals; 631.405
• DOI: 10.1080/00103624.2020.1763393
• Languages: English
• ISSNs: 0010-3624

Abstract

ABSTRACT: 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.