Research of soil units durability change at various agricultural loads

Relevance of knowledge of the nature of stability of soils to degradation processes is defined by changes of physical condition, which is one of the main and most widespread types of transformation of soils and soil cover. Thus, degradation of physical condition of soils is understood as a steady change of their physical properties, first of all, structural condition leading to deterioration of water, air, nutritious, and other modes. It can be tracked when comparing the chernozems formed under the forest belt with the soils which are using under crops of corn and couples. Changes of their physic-mechanical properties being characterized are observed by water proofness, mechanical stability of units and mechanical durability of soil pastes. Considering that the majority of physical properties of soils are not independent values, and are functions from several arguments, such as shrinkage, swelling, penetration resistance, etc., the mean existence of dependence of these properties from humidity, i.e. they represent soil and physical dependences. Quantitatively it is difficult to analyze and compare such dependences. If experimental procedure of their definition leads to a variation (dispersion) of values, for such an assessment and comparison there is a possibility of use of parameters of approximation of experimental dependences. However, conditions of correct application of such an approach, limit of applicability, scientific and reasonable use of parameters of approximations represent an urgent scientific problem. In this article questions of change of strength properties of soil structure, namely, the soil units of 3-5 mm and 5-7 mm in size making agronomically valuable part of soil structure are considered. For research three options of soils under different agricultural loading are chosen. On the basis of the received results on studying of durability and basic physical properties of soils search of correlation of strength characteristics of units and the corresponding physical and chemical properties of soils is executed. The comparative characteristic of the declared properties of soils depending on intensity of loading is carried out.

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