Lozynska A. Productivity of blackcurrant depends on soil maintenance and fertilization in the Right Bank Forest Steppe of Ukraine

The purpose of the research is to increase the productivity of blackcurrant plantations by applying agrotechnological measures: maintaining the soil in the interrows and in the interrows in combination with fertilization with the main macronutrients and fertilizing with the organically based preparation Riverm. The object of the study is the planting of black currant (Suita Kyivska variety) on podzolized heavy loamy chernozem with different soil content in the interrows and in the root strips with fertilization and foliar feeding with the preparation Riverm. The subject of the study is the growth and formation of bushes, fruiting bodies and harvest under different nutrition of blackcurrant plants depending on soil maintenance and fertilization and foliar fertilization. To implement the identified research tasks, a set of generally accepted and special methods aimed at obtaining objective and reliable results was used: field, laboratory, analytical, informational, statistical, as well as economic. Chemical and physicochemical analyzes were carried out by standardized and generally accepted methods using certified devices and equipment in the certified mass analysis laboratory of the UNUS (No. РЯ0078/21 dated 02.11.2021). Scientific novelty: – the content of nitrogen, phosphorus and potassium in plants (berries, leaves, shoots) of black currant was determined, depending on the maintenance of inter-rows, interstices and application of fertilizers; – the parameters of the development of the root system and fruit formations of blackcurrants were established depending on the maintenance of interrows, root strips and the use of fertilizers; the deepest extent of the blackcurrant root system and the layer of its placement is determined by maintaining the soil in the interrows under clean steam, and in the staking strips - by mulching with straw and film with the use of N60P90K90 + Riverm 3% and N60P90K90 + Riverm 5%; – the formation of individual elements of the structure of the blackcurrant crop depending on agrotechnological measures is determined; - it was established that with the improvement of its growing conditions, the indicators of the number of tassels and berries per bush and the weight of berries increase the most; – the formation of the crop and the quality of blackcurrant berries depending on the maintenance of interrows, umbilical strips and the use of fertilizers were evaluated; it has been proven that the highest yield (13.06–13.44 t/ha) is formed by maintaining the inter-rows under clean steam, and mulching strips with a film or straw with the application of N60P90K90 + Riverm 3% foliarly; the content of ascorbic acid in berries under such cultivation is 174–177 mg/100 g, sugars – 8.0–8.2%, acids – 2.33–2.39%. The practical significance of the obtained results lies in the development of recommendations for optimal measures that are used in the cultivation of black currants (Suita Kyivska variety) in the conditions of the Right Bank Forest Steppe of Ukraine. It has been economically proven that in order to obtain a high yield of blackcurrant berries, it is necessary to apply scientifically based agrotechnological measures to keep the rows under clean steam, to mulch the undergrowth strips with a film or straw, and to apply N60P90K90 + Riverm 3% fertilizer foliarly.