Paper Title
Investigation of the Reactions of some Important Weeds to Temperature and CO2 Increases

The world has been in constant change since its formation. These changes, which naturally started out in the beginning, were thought to make human life more convenient. As a result of human activities, some changes that have begun to affect the planet have begun to adversely affect us. The rapid increase in the human population brought with it industrial activities, which resulted in devastating changes in the earth's ecosystem. One of the most important changes in the world is the global warming caused by the greenhouse effect, which is a result of the increase of carbon dioxide (CO2). Parallel to the increase in CO2 every day, the temperature increase keeps its place on the agenda. Global climate change is now a global issue. Climate change is the most devastating effect on biological diversity. Studies was carried out in a fully automated four-roomed greenhouse at Agricultural Faculty of Inonu University, in order to determine the reactions of some weeds (Amaranthus retroflexus L., Portulaca oleracea L., Physalis angulata L. and Sorghum halepense (L.) Pers.) to different CO2 concentrations and different temperatures. Experiments were conducted in a randomized parcel replicated 4 at different temperatures (26 0C / 16 0C, 29 0C / 19 0C, 32 0C / 22 0C, 35 0C / 25 0C) and different concentrations of CO2 (400 ppm, 600 ppm, 800 ppm, 1000 ppm). As a result of the studies, while the lowest values for plant height, wet weight, dry weight, root length, root wet weight and root dry weights of weeds were taken from 400 ppm CO2 and 26 0C / 16 0C, the highest values were obtained from 1000 ppm CO2 and 35 0C / 25 0C from the temperature. As a result, CO2 increase leads to atmospheric temperature increase and temperature increase leads to decrease in crop yields. In parallel with the increase in CO2, it is expected that the increase in environmental temperature will negatively affect the plants and agriculture even if there are some positive developments in the plants. Keywords - Some Weeds, Temperature, Carbone Dioxide, Plant Development