Contrary to popular belief, farming—when viewed through a wildlife ecosystem perspective—is not a natural act. Modern farming, with its pesticides, GMOs, and high tech interventions, is even further from anything remotely labeled natural. One tiny step towards maintaining a semblance of balance is called crop rotation, e.g. planting different species yearly. This is done because the "soil of an area that has the same plant in it year after year can become stripped of certain nutrients."
Some advantages of crop rotation: