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Identification of soil colours, which have crucial importance as diagnostic criteria for mollic horizon and mollic-based soil groups, is considered to be impacted by personal skill and experience of the researcher. The experiment with soil colour identification in the field using standard Munsell charts and the laboratory identification by four groups of experts, as well as using the electronic portable colorimeter was conducted using 30 loess- and alluvium-derived soils. The manual field identification of mollic horizons by individual highly experienced researcher, based on colour value and chroma (using the Munsell charts), may be overestimated up to 17% compared to manual identifi cation by group of experts under laboratory conditions. The differences between groups of experts were statistically insignificant; however, a weak tendency to identify the lower value (dry) and higher chroma (moist) with increasing expert age or experience was observed (in the order: MSc students -- PhD students -- doctors -- professors). No significant difference in soil colour identification was observed in relation to gender of experts. An electronic measurement of soil colours by portable colorimeter confirmed an overestimation of the manual identification of mollic horizons by 17% and 7%, compared to individual (field) and group (lab) recognition, respectively. The study confirmed the suitability of standard portable colorimeter for the verification of colours required for mollic horizon, in particular in soils those colour values are close to the classification threshold and their manual recognition depends on individual expert's skills. [ABSTRACT FROM AUTHOR]

Characterization and classification of soils is a major tool for understanding the nature and status of soils. The objective of the study was to characterize, classify and map the soils of Upper Hoha sub-watershed according to the World Reference Base for Soil Resources [1]. Seven representative pedons were opened in Upper Hoha sub-watershed at different landscape positions. Accordingly, the surface soils of Pedon 2, 3, and 7 consisted of Mollic horizons; whereas Pedon 1, 4, 5 and 6 had Umbric horizons. The subsurface diagnostic horizons identified for the opened pedons were Nitic, Cambic, Ferralic, Plinthic and Pisoplinthic horizons. Pedon 1, 2, 4, 5 and 7 contained a Nitic horizon; whereas, Pedon 3 and 6 had Cambic horizons. Also Pedon 3, 4 and 6 had Plinthic, Ferralic and Pisoplinthic subsurface horizons respectively. The surface soils of Pedon 1, 2 and 4 showed anthric properties which is affected by long-term plowing; and Pedon 2, 5 and 6 showed sideralic properties in the subsurface soils which had lower CEC

Maintaining or recovering soil health is becoming a goal of many policies carried out at national, continental and global scales to promote global health. This viewpoint is aimed at stressing the relevance of a holistic approach to soil health assessment and monitoring, which is not only related to soil functional biodiversity but also considers the genetic horizons of the soil profile and not just the topsoil. We highlight that soil health has different connotations depending on the environmental setting and may show high spatial and temporal dynamics. Although the biological activity is often concentrated in the surficial horizon, we report increasing evidence that deep soil horizons host relevant biological communities, which are regulated by soil conditions that are usually different from those present in the topsoil. The processes responsible for the formation of surface and subsurface soil genetic horizons produce soil features that select the presence of organisms. The natural self‐organization of soil features is at the basis of the soil classification systems and of their ability to differentiate soil taxa and appreciate pedodiversity. Examples are reported of surface and deep soil genetic horizons as an important interpretative tool of soil functional biodiversity and soil health. Therefore, the assessing and monitoring of soil health should not be carried out at fixed depth, but according to soil genetic horizons. We conclude that the loss of the natural self‐organization of genetic horizons is a form of soil health degradation. [ABSTRACT FROM AUTHOR]

Maintaining or recovering soil health is becoming a goal of many policies carried out at national, continental and global scales to promote global health. This viewpoint is aimed at stressing the relevance of a holistic approach to soil health assessment and monitoring, which is not only related to soil functional biodiversity but also considers the genetic horizons of the soil profile and not just the topsoil. We highlight that soil health has different connotations depending on the environmental setting and may show high spatial and temporal dynamics. Although the biological activity is often concentrated in the surficial horizon, we report increasing evidence that deep soil horizons host relevant biological communities, which are regulated by soil conditions that are usually different from those present in the topsoil. The processes responsible for the formation of surface and subsurface soil genetic horizons produce soil features that select the presence of organisms. The natural self‐organization of soil features is at the basis of the soil classification systems and of their ability to differentiate soil taxa and appreciate pedodiversity. Examples are reported of surface and deep soil genetic horizons as an important interpretative tool of soil functional biodiversity and soil health. Therefore, the assessing and monitoring of soil health should not be carried out at fixed depth, but according to soil genetic horizons. We conclude that the loss of the natural self‐organization of genetic horizons is a form of soil health degradation. [ABSTRACT FROM AUTHOR]

Diverse chernozemic soils featured by thick mollic horizon, rich in humus, dark-coloured, structural, and saturated with base cations are relatively common in the loess-belt of SW Poland. It is postulated, that most of these soils may have similar initial (chernozemic) history of thick humus horizon, related to climate conditions and vegetation in the Late Pleistocene and the Neolithic periods. However, these soils exist on various bedrocks and under different moisture conditions that led to the development accompanying features and variable classification of soils, both in Polish and international soil classifications. The aim of the paper is to presents the most important variants of loess-derived chernozemic soils of SW Poland, in relation to local conditions, which influenced soil transformation and present spatial diversification. ‘Typical’ chernozems (WRB: Calcic Chernozems), which have a mollic horizon and secondary carbonates, but are free of strong redoximorphic features, are rather uncommon in the region. Whereas, the black earths (WRB: Gleyic/Stagnic Chernozems/Phaeozems), featured by the presence of mollic horizon and strong gleyic or stagnic properties in the middle and bottom parts of the profiles, are predominant loess-derived chernozemic soils in SW Poland. Their most specific forms, developed on the clayey bedrock, are black earths with a vertic horizon (WRB: Vertic Stagnic Phaeozems). The strongly leached chernozemic soils developed over permeable subsoils, lacking carbonates and free of (strongly developed) stagnic/gleyic properties are called grey soils, often featured by the presence of subsurface diagnostic horizons cambic or luvic (WRB: Cambic/Luvic Phaeozems).