Copper micronutrient fixation kinetics and interactions with soil constituents in semi-arid alkaline soils

Journal article

Authors/Editors

Eze, Peter

Research Areas

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Publication Details

Author list: Udeigwe TK, Eichmann M, Eze PN, Ogendi GM, Morris MN, Riley MR

Publisher: Taylor & Francis: SSH Journals / Taylor & Francis: STM, Behavioural Science and Public Health Titles

Place: ABINGDON

Publication year: 2016

Journal: Soil Science and Plant Nutrition (0038-0768)

Journal acronym: SOIL SCI PLANT NUTR

Volume number: 62

Issue number: 3

Start page: 289

End page: 296

Number of pages: 8

ISSN: 0038-0768

eISSN: 1747-0765

Languages: English-Great Britain (EN-GB)

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Abstract

This study examined the fixation pattern and kinetics of plant-available [diethylene triamine pentaacetic acid (DTPA)-extractable] copper (Cu), as well as basic soil properties that influence Cu availability in selected semi-arid soils. Soil samples from six different series were used and data obtained from Cu extraction experiments fitted to various kinetic models. Soils were also characterized for a suite of chemical and physical properties. The majority (80%) of the plant-available Cu fixed over the experimental period of 90 d occurred within the first 14 d. The amount of plant-available Cu fixed within the first 14 d tended to be influenced by the combination of organic matter (OM) and pH. The total amount of Cu fixed at the end of the experimental period of 90 d was influenced by pH and a combination of pH and calcium carbonate. The fixation of plant-available Cu over the experimental period was better described by the power function model [R-2=0.90, Standard Error (SE)=0.099] but poorly by the other models (R-2: 0.58 to 0.59), while reactions within the first 35 d were better described by the second-order model (R-2=0.98, SE=0.008), suggesting a different fixation pattern. Findings from this study provide a basis for a more mechanistic approach to evaluating and comparing the fixation of Cu micronutrient compounds in these semi-arid soils for more scientific management decision making.

Keywords

diethylene triamine pentaacetic acid, kinetic models, Micronutrients, soil fertility, West Texas

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