Supply fertilization systems (ipomoea batatas) in the conditions of the left bank Forest Steppe of Ukraine

The research was conducted during 2019–2020 in the laboratory of agrochemical research and product quality of the Institute of Vegetable and Melon NAAS. The soil of the experimental site - typical low-humus loamy chernozem on loess loam (in the plow layer (0-25 cm) of humus contained 4.3%N hydrolyzed - 139,0 mg/kg, mobile P - 106-119 mg/kg and exchangeable K - 93 mg/kg of soil, hydrolytic acidity - 2.8 mg-Eq per 100 g of soil, pH of salt extract - 5.7, the sum of absorbed bases - 26.0 mg-Eq per 100 g of soil). The research studied the effectiveness of different fertilizing systems: 1) without fertilizer (control); 2) N185P185K225; 3) N370P370K450; 4) N370P370K450 + foliar fertilization with complex fertilizer "Nutrivant plus universal" 2 kg / ha in 3 terms; 5) mold 20 t/ha + ash 1 t/ha 6) mold 20 t/ha + ash 1 t/ha + tillage planting soil fertilizer "Hraundfiks" (3 l/ha) + the first fertigation microbial drug " Azotophyte ”(1 l/ha) + for the second fertigation microbial preparation“ Organic Balance ”(1 l/ha) + foliar fertilization“ Help-rost for vegetable plants ”2 l/ha in 3 terms. Foliar fertilization was carried out in three terms: 30 days after planting (III decade of June), with active growth of vegetative mass (III decade of July), with active growth of tubers (III decade of August). The research was conducted in accordance with generally accepted methods. The total area of the plot was 33.6 m2, accounting - 21 m2, repetition - three times. In the study, sweet potatoes of the Slobozhansky Ruby variety were grown under drip irrigation, planting schemes (100 + 40) x 25 cm and mulching the soil with straw.