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Copyright of Revista de Ciencias Agricolas is the property of University of Narino, Faculty of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Ciência Agronômica is the property of Revista Ciencia Agronomica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Ciência Agronômica is the property of Revista Ciencia Agronomica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Ciência Agronômica is the property of Revista Ciencia Agronomica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

• There is a distinct perception with significant variability when human evaluators rely on subjectivity to diagnose the cohesive character of soils. • The threshold value of tensile strength for the cohesive character associated with dry-soil consistency was similar among different human evaluators. • Taxonomic systems should include at least one class with a moderate degree of cohesion in the diagnosis of the cohesive character. This study aimed to establish reference values for tensile strength (TS) to aid the diagnosis of the cohesive character of soils. The hypotheses were: i) the subjectivity leads to variability in the human perception in the qualitative assessment of the cohesive character; ii) it is possible to develop a TS scale that aids in the quantification and diagnosis of the cohesive character. Three evaluators measured the aggregates/clods' tensile strength using TS-Soil equipment. An electronic dynamometer was used as a control group, using a completely randomized design. The data were analyzed using statistical tests and regression analysis. Additionally, the values assigned in the qualitative evaluation of consistency by the evaluators were related to the tensile strength data. When comparing the means of the evaluators, who used the TS-Soil equipment to quantify the TS of aggregates/clods, with the electronic dynamometer (standard equipment) using the Dunnett test, no significant differences were found in 70 % of the comparisons for horizons with cohesive character and 57 % for horizons without cohesive character. The threshold for diagnosing the cohesive character was set at a TS value 66 kPa (very hard consistency). A significant number of scores were associated with hard consistency (40≤ TS kPa <66). The study concluded that there is variability in the qualitative assessment of cohesive character and that a TS scale can be useful in quantification and diagnosis. Furthermore, it highlighted the importance of considering a moderate degree of cohesion in taxonomic systems when diagnosing cohesive character. The academic contribution of this study materializes as soil taxonomic systems begin to incorporate quantitative criteria in the diagnosis of cohesive character in soils. As for practical applications, the use of the cohesion degree scale allows the pedologist to recognize the cohesive character in soils more assertively. [ABSTRACT FROM AUTHOR]

The overall assessment of knowledge produced and transmitted by a human group is set as ethnoscience field. This evaluation of information related to soils and its relation with natural resources, as well as strategies developed to production, are the scope of study from ethnopedology. Participatory methodologies which promote the inclusion of those directly involved are basic assumptions of ethnopedology. Areas of evaluation from ethnopedology studies are related, among other aspects, to nomenclatures for soil classification and management practices. The increasing ethnopedological development reveals soil importance recognition as a limited and essential resource for life and strengthens an important conservationist view to be considered in researches of soil science. [ABSTRACT FROM AUTHOR]