Changes, Problems and Solution of Weeds in Cotton Fields After Irrigation in ？anl？urfa Province

？anl？urfa province is an important place for Turkey's cotton production providing about half of the production. This study was carried out in ？anl？urfa to determine weed problems by determining the frequency and density of the weeds that restrict the cotton production. For this purpose, 60 cotton fields were surveyed in 2015. The most widespread species in the fields were ranked: Sorghum halepense (L.). Pers. (johnsongrass, %73), Xanthium strumarium L., (common cocklebur, %67), Solanum nigrum L. (black nightshade, %60), Physalis philadelphica Lam. (tomatillo, %53) and Portulaca oleracea L. (common purslane, %48). Compared with the results of similar studies carried out in the region over 25 years ago; it was observed that the weed species, their frequency and density have been changed, significantly. It is predicted that further changes will continue in the future due to increase of irrigation, changes of the cropping pattern and weed control strategies, and also global warming