TY JOUR TI CULTIVATION TECHNOLOGY ELEMENTS INFLUENCE ON THE SPRING RAPE CROPS POLLUTION IN THE NORTHERN KAZAKHSTAN CONDITIONS KW spring rapeseed KW technology elements KW weediness KW varieties KW hybrids JO Bulletin of KSAU AU Cherkasova, E.A. AU Rzaeva, V.V. PY 2022 IS 0 PB Krasnoyarsk State Agrarian University