Chemical Farming implies the use of chemicals for the control of insects, weeds and diseases. In this paper, I want to deal with the use of herbicides in cotton that can be used with, or as a substitute mechanical cultivation. I also want to consider how old products can be used more-effectively and how new ones provide more flexibility in operations. Whilst new opportunities can be provided with new chemicals, some opportunities have been lost with the old ones. Whenever a natural Ectosystem is converted to an artificial farming system amongst other things, weeds become a major problem, even to the point where financial viability is threatened.