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. 2021 Apr 22;18(9):4461. doi: 10.3390/ijerph18094461

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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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Correlation matrix representing correlation among different attributes of maize crop followed by different treatments, such as Kasur soils (0% biochar) (1) NK−8441, (2) P−1543, (3) NK−8711, (4) FH−985; (3% biochar) (5) NK−8441, (6) P−1543, (7) NK−8711, (8) FH−985; Sialkot soils (0% biochar) (9) NK−8441, (10) P−1543, (11) NK−8711, (12) FH−985; (3% biochar) (13) NK−8441, (14) P−1543, (15) NK−8711, (16) FH−985. Positive correlations are displayed in blue and negative correlations in red. The color legend on the right-hand side of the correlogram shows the correlation coefficients and the corresponding colors. The abbreviations are as follows: Shoot length: SL, Root length: RL, Shoot dry weight: SDW, Root dry weight: RDW, Chlorophyll contents: SPAD, Photosynthetic rate: PR, Transpiration rate: TR, Stomatal conductance: SC, Lipid peroxidation: LP, Proline contents: PL, Total carotenoids: CR, Soil Cr lll: SCrlll, Shoot Cr III: SHCrIII, Root Cr III: RCrIII, Soil Cr VI: SCrVl, Shoot Cr VI: SHCrVI, Root Cr VI: RCrVI, Relative water contents: RWC, Electrolyte leakage: ELC, Catalase: CAT, Ascorbate peroxidase: ASC, Glutathione peroxidase: GP, Soluble sugars: SS, and Superoxide dismutase: SOD.