The research of possibility of using sewage of urbosystem in forage crop rotation for organic livestock farming

Abstract

The matter of pollution of water course is particularly acute in the lower areas of the flow of the Dnieper river, where almost all natural and human-made components of the river runoff, which change the hydrological and hydrochemical regime of the reservoir, are accumulated. Man-made reservoirs in the middle and lower parts of the Dnieper, which constitute an intensive source of secondary detritus production of organics, cause additional matter for local hydro ecosystems. Therefore, the development of organic agriculture in conditions of dry climate and limited water resources is be aimed at reducing water dependence through import of water-containing products, use of the latest water-efficient technologies and alternative sources of irrigation. Implementation of management of rational use of water resources will ensure development of the water sector and organic agricultural industry, improvement of quality of life of society, rational use and preservation of water resources of the Dnieper River. The water suitability for irrigation is determined by mineralization, calcium indicator, pH, toxic alkalinity, total chlorine content, chemical compounds, rate of ion exchange and pathogenic microorganisms. According to the standard DSTU 2730:2015 «Environmental protection. The quality of natural water for irrigation. Agronomic criteria». Sewage having amelioration and fertilizing value due to contents of 15-88 kg of nitrogen, 16-18 kg of potassium, 12-16 kg of phosphorus, 20-150 kg of calcium and magnesium in 1000 m3 of sewage facilitates increase of crop yielding capacity with limiting nutrient elements, improve the qualitative characteristics of soil and organic agricultural products, provides obtaining of additional Virtual water in organic production Effects Ecological: rational use of water resources due to irrigation of organic yield with surface sewage; reduction of anthropogenic pressure on water sources Social: ecologically safe products; allowable eating quality of products; absence of genetically modified organisms; provision of health and socio-economic interests of the population. Economical: saving of mineral resources; additional income subject to the regulatory quality of irrigation water, formation of the domestic market of organic products; competitiveness and the possibility of entering the global market of organic products. 231 income in growing of winter wheat in the amount of 154.7 UAH/ha, spring wheat - 108.8 UAH/ha, maize grain - 186.5 UAH/ha, forage maize - 816.3 UAH/ha, sugar beets - 184.9 UAH/ha, sunflower - 202.1 UAH/ha. It is determined in the direction of studying the possibilities of irrigation with such waters that the volume of annual formation of sewage surface urban runoffs of urban system Kherson of is 20.5 mln m3