TY JOUR TI EFFECT OF ELECTROHYDRAULIC TREATMENT ON NITRATE NITROGEN CONTENT IN IRRIGATION WATER KW high-voltage capacitors KW spark discharges KW nitrate ions KW crop production KW fertilizers KW eutrophication KW electrohydraulic installation JO Vestnik of Kazan State Agrarian University AU Belov, A.A. AU Vasil'ev, A.N. AU Stepanychev, Y.A. AU Sharko, A.A. PY 2020 IS 15 PB Kazan state agrarian University