In years 2006-2009, six experiments were carried out. Their aim was the assessment of the effectiveness of herbicides used for weed control in maize at lower doses and different dates. Herbicides were applied in three variants: (1) twice on weeds at a stage no later than two proper leaves regardless of maize developmental stage, (2) in-leaf operation + on-leaf operation, (3) two on-leaf operations – at the stages of 1-3 and 4-6 maize leaves. In the research, the following active substances were used: acetochlor, dicamba, linuron, florasulam + 2.4-D, fluroxypyr, foramsulfuron + iodosulfuron, nicosulfuron, nicosulfuron + rimsulfuron, and rimsulfuron. Research showed that after the application of lower herbicide doses, there is a possibility to obtain satisfactory herbicidal effect. Limitation of weed number and weed development inhibition made it possible to obtain yields that did not differ significantly from the ones obtained after the operations with standard doses. The best component in the studied herbicide mixtures proved to be the combination of florasulam + 2.4-D. In the case of significant Chenopodium album L. infestation, fluroxypyr should not be used as a mixture component. It was also found that in the conditions of late and uneven weed emergence, the system of two operations with lower herbicide doses limited effectively maize infestation in a longer growth period.

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