EN
The research was carried out in 2007–2009 in the Institute of Plant Protection – National Research Institute in Poznań. Six field trials were carried out on spring wheat and spring barley in two sites of Poland. The aim of experiments was an evaluation of efficacy of some herbicides applied at full (recommended) doses and reduced doses (½ and ¼ of full dose). The following active substances were used: 2,4-D, MCPA, fluroxypyr, amidosulfuron and tribenuron-methyl. Applied herbicides used at reduced did not effectively the number of weeds however they had a positive effect on weed weight reduction. Yield of spring cereals from all treated plots was higher as compared to untreated ones. The amount of yield obtained after full doses of herbicides application (except MCPA) was significantly higher comparing to untreated plots. No significant differences was recorded between treated plots. The obtained results showed the possibility of weed controlling at lower doses of herbicides, according to proecological directions protection of natural environment as well as integrated pest management.