Pedotransfer functions for estimating maximum bulk density of Brazilian agricultural soils

Pedotransfer functions for estimating maximum bulk density of Brazilian agricultural soils | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 2 December 2025 V1 Latest version Share on Pedotransfer functions for estimating maximum bulk density of Brazilian agricultural soils Authors : Diego Tassinari 0000-0003-4701-9668 [email protected] , Michel Souza , Eduardo Cândido 0000-0001-9478-5125 , Ayodele Ajayi , Alberto Nhaca , Darcio Constante , Moacir de Souza Dias Junior , and Bruno Silva Authors Info & Affiliations https://doi.org/10.22541/au.176463653.32035427/v1 119 views 75 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Proctor compaction test is a standard method for obtaining soil maximum bulk density (Dbmax). This study aimed at developing pedotransfer functions (PTF) for estimating Dbmax for Brazilian soils. A dataset with 234 data entries from peer-reviewed papers including texture, soil organic carbon content (SOC) and bulk density (Db) was used to predict Dbmax. Prediction methods included multiple linear regression, stepwise and expert variable selection, bagged trees, support vector regression (SVR) and random forest (RF). Model performance was compared to other PTF from the literature and by validation datasets. Clay and SOC content ranged from 49 to 787 g kg-1 and from 0.6 to 42.0 g kg-1 respectively, with Dbmax varying from 1.12 to 2.03 g cm-3. RF and SVR reduced variance for the validation with Brazilian soils, but overestimated Dbmax, although including Db reduced this bias. For the dataset from South, Central and North Americas, linear regression presented high variance and low bias, SVR presented low variance but high bias, while RF presented the best trade-off between both. Despite RF superior performance, Dbmax for Brazilian soils can also be estimated by Dbmax = 2.355 + 0.6*SAND² - 0.4*SILT² - 0.44*ln(SAND) - 0.52*ln(CLAY) - 0.38*(CLAY:SAND) - 0.81*(SOC/CLAY+SILT) and Dbmax = 1.41 + 0.32*SAND² - 0.10*SILT² - 0.23*SOC + 0.37*Db (RMSE of 0.084 and 0.066 g cm-3 respectively), thus allowing for an easy estimation of the reference Db when calculating the degree of compaction. Supplementary Material File (manuscript_ rev_pedotransfer final sssaj.docx) Download 19.25 MB Information & Authors Information Version history V1 Version 1 02 December 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords degree of compaction pedometry proctor compaction test soil compaction curve Authors Affiliations Diego Tassinari 0000-0003-4701-9668 [email protected] Universidade Federal de Lavras View all articles by this author Michel Souza Universidade Federal de Lavras View all articles by this author Eduardo Cândido 0000-0001-9478-5125 Universidade Federal de Lavras View all articles by this author Ayodele Ajayi Federal University of Technology Akure View all articles by this author Alberto Nhaca Universidade Federal de Lavras View all articles by this author Darcio Constante Universidade Federal de Lavras View all articles by this author Moacir de Souza Dias Junior Universidade Federal de Lavras View all articles by this author Bruno Silva Universidade Federal de Lavras View all articles by this author Metrics & Citations Metrics Article Usage 119 views 75 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Diego Tassinari, Michel Souza, Eduardo Cândido, et al. Pedotransfer functions for estimating maximum bulk density of Brazilian agricultural soils. Authorea . 02 December 2025. DOI: https://doi.org/10.22541/au.176463653.32035427/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . 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