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. 2022 Jul 28;15(15):5233. doi: 10.3390/ma15155233

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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The effect of the amendments on the content of trace elements in the soil illustrated with a PCA analysis. Key: points show the samples with elements (WMA—without material amendments, C—compost, B—bentonite, CaO—calcium oxide; 0—0 cm³ (control), 2.5—2.5 cm³, 5—5 cm³, and 10—10 cm³ petrol per kg of soil.