This project focused on the control of nutgrass. Nutgrass (Cyperus rotundus) is considered to be the world's worst weed and inf es ts over 15% of the cotton growing area. Nutgrass adversely affects cotton by competition for light, nutrients and water, and indirectly through lint c ontamination. reduced irrigation efficiency and increased soil problems. The project assessed the effects of herbicides, cultivation and rotation crops on nutgrass control using a number of field experiments located throughout the NSW cotton area. Most of these experiments will run for at least 2 seasons. but only the results of the first season are covered in this report.