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The role of organic matter and other soil properties in Zn2+ activity and AB-DTPA-extractable Zn in soils

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dc.contributor.authorCatlett, Kathryn M., author
dc.contributor.authorLindsay, Willard Lyman, 1926-, advisor
dc.contributor.authorHeil, Dean, advisor
dc.contributor.authorSutton, Sally J., committee member
dc.contributor.authorBarbarick, K. A., committee member
dc.contributor.authorEbinger, Michael, committee member
dc.contributor.authorSoltanpour, P. N. (Parviz Neil), 1937-, committee member
dc.date.accessioned2007-01-03T06:01:18Z
dc.date.available2007-01-03T06:01:18Z
dc.date.issued2000
dc.description.abstractZinc is a plant micronutrient as well as a potential heavy metal contaminant in soils. In soil solution, the free Zn activity determines the availability of Zn as a micronutrient and its characteristics as a heavy metal contaminant. A better understanding of the mechanism that controls free Zn activity could improve soil treatments of Zn deficiency or toxicity. In this study, Zn2+ activity (measured by chelation) was related to soil properties for 18 alkaline soils from three farms in eastern Colorado. Organic carbon and pH were statistically significant parameters in a regression with log Zn2+ activity. Principal component analysis and path analysis were studied and applied to these soils. Results of principal component analysis showed that the first principal component, summing clay and total soil Zn and subtracting soil carbon, accounted for 52% of the variability in the soils. Soil pH and inorganic carbon dominated the second principal component, which accounted for 32% of the variability. Results of path analysis showed that direct effects of pH, total soil Zn, and organic carbon are important in predicting free Zn activity in these soils. Indirect effects of clay through organic carbon, of inorganic carbon through pH, and between pH and organic carbon were also important. Results from statistical analyses indicate that adsorption of Zn on organic matter may control Zn solubility in soils. To further explore this potential mechanism, Zn adsorption to organic matter was modeled using the chemical equilibrium model, MINTEQA2, and model results were compared to experimental data from the three Colorado farms. Experimental and model results were in close agreement. Adsorption onto organic matter may control Zn solubility in acidic to neutral soils, while precipitation may control Zn in alkaline soils. The AB-DTPA soil test can also be used as a measure of the availability of micronutrients to plants. AB-DTPA-extractable Zn was measured and correlated to soil chemical properties for soil samples described above. Soil organic carbon and total soil Zn were statistically significant parameters in a linear regression with AB-DTPA extractable Zn. Organic matter and clay contents were positively correlated with AB-DTPA-extractable Zn.
dc.format.mediumdoctoral dissertations
dc.identifier2000_Spring_Catlett_Kathryn.pdf
dc.identifierETDF2000400017SOCS
dc.identifier.urihttp://hdl.handle.net/10217/80813
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relationCatalog record number (MMS ID): 991009154229703361
dc.relationS592.6.Z55.C38 2000
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectSoils -- Zinc content
dc.subjectHumus
dc.titleThe role of organic matter and other soil properties in Zn2+ activity and AB-DTPA-extractable Zn in soils
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineSoil and Crop Sciences
thesis.degree.grantorColorado State University
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy (Ph.D.)

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