Kayugina S.M.

Quantile analysis of the density of addition and porosity of virgin gray forest soils in the south of the Tyumen region

Statistical processing of a large array of data on the density of addition and total porosity of virgin gray forest soils in the south of the Tyumen region was performed. Quantile analysis (boxplot diagrams) was used to estimate the variability of values. It is established that the type of gray forest soils has relatively favorable agrophysical properties. The average density of the humus horizon (A1) in all three subtypes has values that fall within the range of the "optimum" of most agricultural crops. The illuvial horizon of light gray and actually gray forest soils is compacted, therefore, when these soils are introduced into arable land in rainy years, there is a high probability of violation of aeration and surface waterlogging.

Keywords: GRAY FOREST SOILS, ADDITION DENSITY, POROSITY, QUANTILE ANALYSIS, BOXPLOT DIAGRAM