A field experiment in winter wheat was carried out in Czesławice (central part of Lublin region) in 2007–2009. The research included 3 doses of herbicides, fungicides and a retardant (100%, 75%, 50%) as well as the type of adjuvant (supeficially active, oil, mineral). Control objects without adjuvant were also taken into consideration. It was proved that the reduction of pesticides doses by 50% caused a considerable decrease of the protein, and wet dluten content, the falling number and sedimentation value in winter wheat grain as compared with the 75% dose and with the maximum dose. Thanks to the addition of adjuvants (especially oil adjuvant) to spraying liquid the reduction of pesticides doses by 25% did not cause deterioration of grain quality indices. Further reduction (by 50%) of pesticide doses, in spite of interaction with adjuvants, had a negative effect on the analysed quality features of grain.
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