Two-year studies (2015-2016) were carried out at the Research Institute of Horticulture in Skierniewice. The aim of these studies was to determine the effect of weed flaming, combined with manual and mechanical treatments on weed infestation, growth and yield of carrot and population of selected groups of soil organisms. The number of weeds was significantly reduced due to methods of weeding. The higher number of weeds was recorded after flame weeding, in comparison to combined methods. The lowest results of weed control were obtained after weed flaming carried out before emergence of carrot and three times after emergence without any additional hand weeding. The hand weeding in the intra-rows of carrot immediately after flaming treatment has increased effectiveness of weed control. Studies showed that the better weed control was noticed after replacing one or two last flaming treatments with mechanical treatments. The mechanical treatments did not damage carrot plants while flaming caused burning the plants and drying the bottom leaves. The rate of these damages depended on execution accuracy, number of flaming treatments and development stage of carrot. The lowest yield of roots were obtained from untreated plots and from the plots with weeds flaming. During the studies changes in population of some groups of soil organisms were observed.