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. 2019 Oct 25;12(21):3493. doi: 10.3390/ma12213493

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Fraction release of (a) KNO₃ and (b) NH₄NO₃ at different loading concentrations.