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Type: Journal article
Title: Rapid and low-cost method for evaluation of nutrient release from controlled-release fertilizers using electrical conductivity
Author: Cancellier, E.
Degryse, F.
Silva, D.
da Silva, R.
McLaughlin, M.
Citation: Journal of Polymers and the Environment, 2018; 26(12):4388-4395
Publisher: Springer
Issue Date: 2018
ISSN: 1566-2543
Statement of
Eduardo Lopes Cancellier, Fien Degryse, Douglas Ramos Guelfi Silva, Rodrigo Coqui da Silva, Mike John McLaughlin
Abstract: Methods to determine nutrient release rates of coated fertilizers usually rely on chemical analyses, which often are time-consuming and/or expensive. Our goal was to develop an innovative and rapid low-cost method to evaluate nutrient release from polymer coated MAP or urea using conductometry. The release in water is determined by measuring the electric conductivity (EC) over time, with intervals dependent on release rates. In the case of soluble salt fertilizers, EC can be immediately determined and converted to a concentration using a calibration curve. In the case of urea, an additional step is needed to convert the neutral urea into ammonium. The release rates in water were assessed for a range of commercial and laboratory-coated fertilizers. A validation test demonstrated strong agreement with the release determined using analytical techniques. The EC method hence offers an easy way to quickly evaluate the time course of release of nutrients from controlled-release fertilizers.
Keywords: Urease; polymer coated fertilizers; phosphorus; nitrogen; release rate
Rights: © Springer Science+Business Media, LLC, part of Springer Nature 2018
DOI: 10.1007/s10924-018-1309-1
Appears in Collections:Agriculture, Food and Wine publications
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