Humus conditions of the Pre-Dnisterian Podolia Haplic Chernozems

Abstract

The humus state of chernozems typical of Pre-Dnisterian Podolia is investigated. It has been established that for the content of humus the chernozems typical of the Pre-Dnisterian Podolia are low humus (2.78–3.98 %). With depth, the content of humus decreases gradually, indicating a uniformly accumulative type of distribution of organic matter in the soil profile. It is determined that in typical chernozems the phenomenon of moderate migration of humic acids is observed, thus forming a deep humus profile. Humic content to the depth of 90–100 cm is dominated by humic acids (Cga:Cfais 1.12–1.78). The general tendency of relative “pluralisation” of the arable lay eras a result of its agronomic exhaustion has been observed. In relation to the Cga to the general organic C, the chernozems soil of the study area is characterized by a high and very high degree of humification of organic matter. It is proved that the intensity of the migration processes of humic acids decreases in the direction of strengthening the hardness of the GTK territory, due to the tightening of calcium carbonates closer to the surface of the soil. Its middle and lower parts were formed, to a large extent, by infiltration of humic acids, moreover, mainly due to the calcium humates. In the case of the use of chernozems without the use of organic fertilizers, the processes of mineralization of plant residues and humus are more active, and the balance of humus is scarce. However, when applying a setoff measures, you cannot only prevent loss of humus but also increased their content. Such a complex should include the following measures: soil replenishment with organic substances, in particular, the planting of perennial grasses and sown crops, the abandonment of a higher grain of grain; minimizing cultivation; creation of optimal ratios of crops in crop rotation to reduce humus losses; the application of meliorants, which would ensure the strengthening of soil fixation of newly formed humus substances. Key words: Pre-Dnisterian Podolia, Haplic Chernozems, humus, humic acids, fulvic acids.