ESTIMATION MODELS OF HUMUS BALANCE AS AN INDICATOR OF AGROECOLOGICAL STABILITY OF LAND MANAGEMENT ORGANIZATION

In modern conditions of intensified dehumidification of soils in Ukraine, studies and diagnostics of anthropogenic changes of soil organic matter have become particularly relevant. The operative calculation of humus balance and a need of organic fertilizers allow to elaborate and, if necessary, to replace more precise experimental method. The analysis of different estimation models of humus balance as an indicator of efficiency and agroecological stability of land use organization was carried out. The determination of humus balance is a tool for assessing the interaction between land use and organic matter in a soil. Conceptual positions of methods for calculating the humus balance all over the world were considered. From a conceptual point of view, the existing methods for calculating the humus balance can be divided into ecological and agronomic. Ecological methods for calculating the humus balance take into account the soil properties, climatic features, agrotechnical measures and are intended to quantify changes in carbon as an indicator of the level of organic matter in arable soils. In turn, agronomic methods are not sensitive to changes in environmental factors, they can not be used to quantify the content of organic matter in the soil. The main regulatory factors of the balance of humus were determined according to existing estimation models and their comparison was done. Approximate humification coefficients for organic fertilizers and plant residues are proposed taking into account the granulometric composition of the soil. It is proved that the balance method of estimation soil humus state have to take into account the theoretically justified content of humus. Soil enrichment with humus without taking into consideration an optimal level can lead to economically expenses. The combination of two methods – balance estimation and direct determination of the accumulation of organic matter in soils can give complete initial information for making management decisions. A differentiated approach to estimation humus balance depending on the scale (farm, region, country) was proposed