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. 2021 Nov 26;10(12):2598. doi: 10.3390/plants10122598

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© 2021 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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Principal component analysis (PCA) and two-way hierarchical cluster analysis (HCA) of individual response variables assessed in onion plants grown in sodic-saline soil and irrigated regularly (Every 30 days) or stressed with deficit irrigation (every 45 days) after soil amendment using biochar and/or K-humate foliar application during 2018/2019 and 2019/2020 seasons. (A,C) PCA-associated scatter plots during 2018/2019 and 2019/2020 seasons, respectively, (B,D) PCA-associated loading plots during 2018/2019 and 2019/2020 seasons, respectively, (E,F) Two-way HCA during 2018/2019 and 2019/2020 seasons, respectively. Variations in the dependent variables among studied treatments are visualized as a heat map. Rows correspond to dependent variables, whereas columns correspond to different treatments. Low numerical values are green colored, while high numerical values are colored red (see the scale at the top right corner of the heat map).