Harmful agrochemicals are fatal to human beings and animals. If they are not properly used and proper precautions are not taken while using them, the farmers and villagers can be in trouble. Examples of such agrochemicals are pesticides.
Wrong choice of pesticides, or overuse of them could harm people. It can harm the crops, it can harm the soil and poison the waters and air too.
So the responsibility of the individuals is to see that they learn the correct use (dose) of agrochemicals and should select the recommended agrochemicals.
Government must make available proper agrochemicals. Government must make laws for the crimes in adulteration of pesticides etc. Government officials related to agriculture and cultivation must monitor the needs and sales.