Plant-available zinc fixation kinetics in semi-arid alkaline soils of the Southern High Plains

Journal article

Authors / Editors

Eze, Peter

Research Areas

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Publication Details

Author list: Udeigwe TK, Eichmann M, Eze PN, Teboh JM, Zolue GM, Umeugochukwu OP

Publisher: Taylor & Francis (Routledge): STM, Behavioural Science and Public Health Titles

Place: ABINGDON

Publication year: 2017

Journal: Archives of Agronomy and Soil Science (0365-0340)

Journal acronym: ARCH AGRON SOIL SCI

Volume number: 63

Issue number: 4

Start page: 553

End page: 564

Number of pages: 12

ISSN: 0365-0340

eISSN: 1476-3567

Languages: English-Great Britain (EN-GB)

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Abstract

This study examined zinc (Zn) fixation pattern and kinetics in three semiarid alkaline soils of the Southern High Plains, USA. Soil chemical data obtained from Zn-extraction experiments conducted at different depths were fitted to various kinetic models to examine Zn fixation patterns. Within the experimental period of 90 days, approximately 57% of the total plant-available Zn fixed occurred in the first 14 days when averaged across all soils and depths. Zinc fixation over the experimental period (90 days) was better described by the power function (pfxn) model (R-2 = 0.87-0.92, standard error [SE] = 0.130-0.154), but poorly described by the zero-, first- and second-order models (R-2 = 0.55-0.76, SE = 0.038-0.267). Average reaction rate constant (from the pfxn model) was higher in the subsurface soils (0.323), suggesting a more rapid Zn fixation, compared to the surface soils (0.293). Zinc fixation within the first 35 days was also more rapid and better described by both the second-order (R-2 = 0.91, SE = 0.018) and pfxn (R-2 = 0.92, SE = 0.119) models. Findings are applicable to field settings and kinetic parameters obtained will help to advance Zn studies and management in these semiarid soils.

Keywords

Cotton, fertility, kinetic models, micronutrient, power function, West Texas

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