In dealing with nitrogen and Pix, points to put the issues in context are that nitrogen is the most important because it can increase yield by much more than a growth regulator such as Pix can. However the two inputs interact because with nitrogen deficiency, Pix may decrease yield. My research aims to combine agronomic inputs so that we can manage cotton to improve efficiency or productivity in a sustainable way. The environmental ledger associated with nitrogen fertilizer use is a maintenance of soil fertility but potentially greater nitrate in the ground water and more nitrous oxide emission to air.