as the population increases , farmer have had to increase their production of food
in order to increase yields, farmers have to get the most out of the land they have
in some part of the world ,marginal land has been used, and in many other places hedgerows have been remove to make field sizes
Famers often use fertilizers to add nutrients to poor soil in order to increase yield
Herbicides ,to reduce weed,and pesticides,to kill insects which can ruin crop,may also be used