Abstract
In the article contains the results of many years research on issues of regularities the influence of chemical melioration, doses and forms of limestone meliorants using different systems of fertilization in crop rotation, which provide preservation of gray forest soil fertility and sustainable crop production.
 Analyzed physical and chemical properties, humus content and reserves, structure of exchange cations, productivity of crops, the effectiveness of various technological events concerning preserving of gray forest loam soil fertility. Clarified basic regularities of Quantitative and qualitative changes in the humus state of gray forest soil, shown the role of organic and mineral components in its formation. Marked, that use of non-consumable part of the harvest as organic fertilizer does not provide an expanded reproduction of gray forest soil fertility. Established The need to regulate the structure of exchange cations in the soil absorbing complex of gray forest soil under conditions of intense agrochemical load by applying natural magnesium-containing mineral.
 Proved effectiveness of the use chemical meliorants In combination with the fertilization system, which provides improving yield and quality of agricultural products.
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