Composition containing a triazine and a thiocarbamate and process for combating weeds in cereal using said composition

New composition of fight against weeds in cereals. This composition contains 10 to 80% of a 1: 2 to 1: 5 from 2-tert-butylamino-4-ethylamino-6-methylthio-1,3,5-triazine and S-ethyl-N, N-hexamethylene thiocarbamate associated with a carrier, diluent and / or conventional dispersant. Application to the treatment preemergence cereals, especially winter cereals containing such as weeds, monocots and dicots.