TY JOUR TI ENERGY MATHEMATICAL MODEL OF A SPRAYER KW machine-tractor unit KW sprayer KW energy consumption KW yield loss KW parameter optimization KW optimization criterion JO Vestnik of Kazan State Agrarian University AU Khafizov, K.. AU Nurmiev, A.A. AU Khafizov, R.. AU Zalakov, N.R. AU Zaycev, P.V. PY 2023 IS 18 PB Kazan state agrarian University