Oliinyk V. Soil organic matter in the application of resource-saving technologies for short-term crop rotation on typical chernozems of Forest-Steppe of Ukraine

The thesis is devoted to the investigation of changes in soil organic matter and humus parameters in typical chernozem under the influence of resource - saving technologies and minimizing tillage farming systems in biologization in short-term crop rotation of Forest-Steppe of Ukraine. The mass of crop-root residues entering the soil after crop rotation value and the ratio of them C:N was investigated. The amount of organic matter in typical chernozem and changes of the main indicators of humus condition that occurred under the influence of the use of different tillage systems and different fertilization was analyzed. The effect of organic and mineral fertilizers with using of the straw and green manure application and mineral fertilization on the ratio of carbon to nitrogen, that come into the soil with fertilizers and plants residues was researched. The tendency of al creasing of organic matter in the soil was determinated. In the result, the letting of the plant residues (ancillary products) on field in short-term crop rotation is recommended for organic matter returning in the soil.