In trials in 1973-4 in Krasnodar province with maize hybrid Krasnodarskii-303 given NPK for a targeted grain yield of 8.5 t/ha, application of 5 kg simazine a.i./ha before sowing and 0.3 kg Tordon 22 K a.i./ha as a foliar spray at the 3- to 5-leaf stage or 3 inter-row cultivations gave average yields of 7.81 and 7.53 t/ha, resp.