Contribution of modified P-enriched biochar on pH buffering capacity of acidic soil

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dc.contributor.authorArwenyo, Beatrice
dc.contributor.authorVarco, Jac J.
dc.contributor.authorDygert, Andrew
dc.contributor.authorBrown, Sydney
dc.contributor.authorPittman, Charles U.
dc.contributor.authorMlsna, Todd
dc.date.accessioned2024-01-30T07:56:52Z
dc.date.available2024-01-30T07:56:52Z
dc.date.issued2022-11-06
dc.descriptionP-enriched biochar on pH bufferingen_US
dc.description.abstractBiochar can directly hold cations in soil because of the negative charge that exists on its surfaces. Besides, improving soil cation exchange capacity, the negative charges on biochar surfaces can buffer acid soil by pro tonation and deprotonation mechanisms. Moreover, biochar ameliorates soil acidity due to the presence of ox ides, carbonates, and hydroxides of its basic cations (Ca, Na, K, and Mg). Both biochar surface functional group and basic cation concentrations can be altered by modification with chemical agents which can affect its soil pH buffering capacity. However, the impact of modified biochar application on soil pH buffering capacity is still scanty. This study investigated the pH buffering capacity of acidic soil amended with three P-enriched modified Douglas fir biochars and compared this buffering capacity to amendment with untreated Douglas fir biochar. These three P-enriched biochars, were prepared by treating Douglas fir biochar (DFB), respectively, with: 1) anhydrous calcium chloride (CaCl2) and potassium phosphate monobasic (KH2PO4), 2) calcium carbonate (CaCO3) and diammonium phosphate {(NH4)2HPO4} and 3) an aqueous solution of magnesium sulfate (MgSO4), potassium hydroxide (KOH) and potassium phosphate monobasic (KH2PO4). The three P-enriched biochars were designated as CCPP, CAPP and MSPP, respectively. The soil pH buffering abilities were largely dependent on the added biochar’s alkalinity and ash contents. The residual soil CEC was highly correlated (r ≥ 0.9), with the soil buffering capacity. Both alkalinity and pH buffering capacity improved following the order CCAP > CCPP > MSPP > DFB, while residual soil CEC followed the order CAPP > MSPP > CCPP > DFB. The pH buffering ca pacity of the soil after amendments with 10% CAPP, CCPP MSPP and BFB rose by 84.8, 58.3, 3.0 and 2.5%, respectively. Whereas MSPP had higher concentrations of K+ and Mg2+, greater concentrations of Ca2+ were present in CCAP and CCPP than MSPP. So, Ca2+ concentrations in biochar exerts a greater influence on alkalinity and buffering capacity than Mg2+ and K+ because of 1) its smaller effective hydration radius and larger charge density. 2) calcium hydroxide has a greater water solubility than magnesium hydroxide providing more available base. Since pH buffering capacity depends on cation exchange sites, soil additives containing Ca2+ are prone to create greater impacts than Mg2+ and K+ additives.en_US
dc.description.sponsorshipThis research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.en_US
dc.identifier.citationArwenyo, B., Varco, J. J., Dygert, A., Brown, S., Pittman, C. U., & Mlsna, T. (2023). Contribution of modified P-enriched biochar on pH buffering capacity of acidic soil. Journal of Environmental Management, 339, 117863.en_US
dc.identifier.issnPrint: 0301-4797
dc.identifier.urihttps://hdl.handle.net/20.500.14270/439
dc.language.isoenen_US
dc.publisherElsevier Journal of Environmental Managementen_US
dc.rightsCC0 1.0 Universal*
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/*
dc.subjectAlkalinityen_US
dc.subjectCation exchange capacityen_US
dc.subjectSoluble base cationsen_US
dc.subjectEffective hydration radiusen_US
dc.titleContribution of modified P-enriched biochar on pH buffering capacity of acidic soilen_US
dc.typeArticleen_US

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