In years 2009-2011, four strict field experiments were carried out whose aim was to evaluate herbicides registered for maize applied at lowered doses, against variable weather conditions. Herbicides were applied in the following system: preemergence treatment with s-metolachlor + terbuthylazine + mesotrione and foliage treatment at the 4-6-leaf stage of maize with nicosulfuron + rimsulfuron, nicosulfuron, rimsulfuron, and foramsulfuron + iodosulfuron. Adjuvant Atpolan Bio 80 SL was added to herbicides used in the foliage treatment. Regardless of the weather conditions in the particular growth seasons, the best maize weeding effects were obtained after the preemergence application of the mixture s-metolachlor + terbuthylazine + mesotrione, and subsequently the foliage application of nicosulfuron with adjuvant Atpolan Bio 80 SL. In the conditions of delayed and uneven weed emergence (especially the thermophilic weed species), the system of two treatments with lowered herbicide doses protected most effectively the maize plantation against secondary weed infestation.

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