This book presents an overview on the impact of weeds on crop production and the use of herbicides to curb their negative influence on crop yield. Weeds have an adverse impact on crop quality and yield. Thus, profitable farming depends on their control by well synchronized management methodologies. Chemical herbicides are of crucial significance amongst these techniques. Their progress and commercialization began around 1940's and they significantly facilitated a timely boost in crop yield and quality when it was most required. This book brings together various important topics with scientific researches and outlines some of the contemporary trends in the subject of herbicides. This comprehensive compilation also includes environmental studies on the toxicity and influence of herbicides on natural populations, techniques to cut down herbicide inputs and ensuring the use of bioherbicides as natural substitutes.