TY JOUR TI Assessment of the duration of the critical period of co-growing of weeds and maize hybrids in the steppe zone of the Chechen Republic KW corn hybrids KW weeds KW pests KW diseases KW growth regulator KW humic substances KW critical period of harmfulness KW yield KW yield loss JO INTERNATIONAL AGRICULTURAL JOURNAL AU Magomadov, A.S. AU Okazova, Z.P. AU Titova, L.A. PY 2025 IS 0 PB Electronic science