The effectiveness of macro- and micronutrients in the white lupine cultivation in the southwestern part of the Central Black Earth region

The purpose of the research is to establish the features of the formation of a crop of white lupine seeds when using different types and combinations of macro- and micronutrient fertilizers, to determine their economical efficiency. The emergence of new forms of fertilizers on the market has led to the need to study modern microfertilizers in the chelate form with the best combination of active ingredients for white leg crops on the white lupine. The use of microelement complexes in the Aquamix-T and Akvamiks-TV chelate forms, potassium sulfate and Monopotassium phosphate macroelements, both individually and in various combinations, is effective on white lupine on typical chernozem under the climatic conditions of the southwestern part of the Central Black Earth region. The best combination and application time is foliar application in the phase of budding of white lupine Aquamix-TV 150 g/ha in a mixture with potassium sulphate or mono-potassium phosphate 3 kg/ha. This combination of fertilizers increases linear growth, the mass of air-dry matter of plants, significantly increases the yield of white lupine seeds in comparison with the control by 0.62 t/ha and 0.63 t/ha, respectively. At the same time, the protein content in lupine seeds is maximized, maximum payback of fertilizer application and level of production profitability is achieved. When choosing the time and method of application of complexes of microelements, preference should be given to foliar application in the phase of budding white lupine in comparison with the presowing treatment of seeds. Twice the use of complexes of microelements in chelate form is impractical.