EN
The influence of method and application time of retardant CCC and herbicide fluroxypyr on weed control degree and wheat yielding was examined under field condition during 2006–2008. CCC and fluroxypyr were used separately and in tank mixture at two growth stages: BBCH 31–31 and BBCH 35–37. Both products were applied in recommended doses: CCC – 2.0 l/ha and fluroxypyr – 0.8 l/ha. The selectivity and efficacy assessment was carried out four weeks after treatment. Plants height was measured after wheat heading. At the time of harvest grain yield and weight of 1 000 grains was recorded. A method of CCC and fluroxypyr application did not affect weed control and wheat grain yield, whilst the time of application differentiated effectiveness in weed biomass and wheat height reduction. Later dates of application resulted in less plant shortening as well as weed control limitation.