Determination of the weed, species in barley, wheat and lentil seed in Bayburt provinces.

To determine the weight and density of weed seeds in barley, wheat and lentil crops, a total of 193 seed samples used as seed by farmers was taken randomly from Bayburt province during the year of 1999-2000. In the result of survey study, it was determined 56 weed species belongig to 15 family in barley, 65 species belonging to 18 family in wheat and 36 species belongin to 14 family in lentil. However, Avena fatua L., Lolium multiflorum Lam. and Triticum sp in barley; A. fatua L., Hordeum vulgare and L. multiflorum in wheat;.Vicia spp., Triticum sp. and Sinapis arvensis L. in lentil were determined as the numarical common weed species. On the ather hand, A. fatua, Agrostemma githago L., Boreava orientalis Jaub and Spach., Centaurea deprassa Bieb., Cephalaria sp., Cephalaria syriaca (L.) Schrad., Cichorium intybus L. and Cirsium arvense (L.) Scop. were the most prevalent weed species in barley, wheat and lentil in all samples.