Soil Phosphatase Activities across a Liming Gradient under Long-Term Managements in Kenya

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cg.contributor.affiliationInternational Center for Tropical Agricultureen
cg.contributor.crpWater, Land and Ecosystems
cg.coverage.countryKenya
cg.coverage.iso3166-alpha2KE
cg.coverage.regionAfrica
cg.coverage.regionEastern Africa
cg.creator.identifierRolf Sommer: 0000-0001-7599-9056
cg.identifier.doihttps://doi.org/10.2136/sssaj2017.12.0420en
cg.isijournalISI Journalen
cg.issn0361-5995en
cg.issue4en
cg.journalSoil Science Society of America Journalen
cg.reviewStatusPeer Reviewen
cg.subject.ciatSOIL INFORMATIONen
cg.volume82en
dc.contributor.authorMargenot, Andrew J.en
dc.contributor.authorSommer, Rolfen
dc.contributor.authorParikh, Sanjai J.en
dc.date.accessioned2018-05-25T18:22:59Zen
dc.date.available2018-05-25T18:22:59Zen
dc.identifier.urihttps://hdl.handle.net/10568/92926
dc.titleSoil Phosphatase Activities across a Liming Gradient under Long-Term Managements in Kenyaen
dcterms.abstractCore Ideas We investigated liming in soil mesocosms from 11‐yr managements: no input, mineral N+P, and manure. There were minor or no changes in labile inorganic P, labile organic P, and microbial biomass P. Changes in the activity of different phosphatases following liming depended on management. Liming decreased acid phosphomonoesterase/phosphodiesterase across management systems. Liming can impact the enzymatic component of soil P cycling in the short term.We investigated liming in soil mesocosms from 11‐yr managements: no input, mineral N+P, and manure.There were minor or no changes in labile inorganic P, labile organic P, and microbial biomass P.Changes in the activity of different phosphatases following liming depended on management.Liming decreased acid phosphomonoesterase/phosphodiesterase across management systems.Liming can impact the enzymatic component of soil P cycling in the short term.Changes in the biological drivers of soil P cycling could contribute to improving P availability in weathered soils after liming. The effect of liming on P cycling was evaluated for a Rhodic Kandiudox in western Kenya under no fertilization (UNF), mineral N + P (MIN), and manure (ORG). Ca(OH)2 was applied at six rates in soil mesocosms to establish a pH gradient (4.7–6.4). Labile inorganic P (Pi) increased by ≤1.2 μg g–1 in response to lime and labile organic P (Po) was weakly affected. In MIN, microbial biomass P (Pmic) decreased at ≥6.0 Mg ha–1 (–24%). Liming changed phosphatase activity depending on the management and phosphatase type but did not reflect commonly proposed pH optima of phosphatases. In UNF and MIN, acid phosphomonoesterase activity decreased with pH, and alkaline phosphomonoesterase and phosphodiesterase activity showed minor changes. Liming under ORG altered activity by up to +16% for acid phosphomonoesterase, –16% for alkaline phosphomonoesterase, and +36% for phosphodiesterase. Similar trends were observed for Pmic–normalized activity, including decreased acid phosphomonoesterase under UNF and increased phosphodiesterase under ORG. Pmic–normalized acid phosphomonoesterase activity under ORG was unaffected by liming whereas Pmic–normalized phosphodiesterase activity exhibited a marked decrease under UNF. Across managements, the acid phosphomonoesterase/phosphodiesterase activity ratio peaked at pH 5.0 and decreased thereafter. Despite management‐induced differences in soil P availability, consistent changes in phosphatase activity ratios indicate a short‐term impact of lime on the enzymatic component of P cycling, which could translate to longer‐term changes in Po mineralization and available P.en
dcterms.accessRightsOpen Access
dcterms.available2018-07-12
dcterms.bibliographicCitationMargenot, Andrew J., Sommer, Rolf, and Parikh, Sanjai J. (2018). Soil Phosphatase Activities across a Liming Gradient under Long-Term Managements in Kenya. Soil Science Society of America Journal, 82(4): 850-861.en
dcterms.extent850-861en
dcterms.issued2018-07
dcterms.languageen
dcterms.licenseCopyrighted; all rights reserved
dcterms.publisherWileyen
dcterms.subjectsoilen
dcterms.subjectsoil fertilityen
dcterms.subjectfertilidad del sueloen
dcterms.subjectphosphate fertilizersen
dcterms.subjectabonos fosfatadosen
dcterms.subjectsoil phen
dcterms.subjectph del sueloen
dcterms.typeJournal Article

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