A familiar sight now is Black-headed Gulls following the plough or the rotovator.
Farming is a difficult business to get right and there are many guidelines and regulations to follow.
There are Codes of Practice in existence for spraying pesticides etc on farmland. That said, they are only codes of practice and nothing is mandatory. I watched this spraying activity below from the safety of a car. The fairly high winds and sudden gusts at the time was blowing the spray across the fields and over public roads. There seems little point in having codes of practice, if contractors that carryout this work fail to stick to them and what is important to the Farmer paying for it is that half the spray is blown away and not on the crops.