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. 2022 Apr 30;12:7085. doi: 10.1038/s41598-022-11099-7

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Residuals plotted as a function of SOM for the respective soil texture groups. Markers are color coded by texture class: clay (Cl), clay loam (ClLo), loamy sand (LoSa), sand (Sa), sandy clay loam (SaClLo), sandy loam (SaLo), sandy silty loam (SaSiLo), silty clay (SiCl), silty clay loam (SiClLo), silty loam (SiLo). Median CN values for each texture class shown in Supplementary Table S1. The residuals show a clear particle size effect in the expected direction. The coarse sandy soils having the lowest coordination number and the fine grained clay soils with a broad particle size distribution having the highest CN. This indicates that CN contains both the shape effect and the secondary particle size effect.