What is the effect of agrochemicals on the soil?herbicides,pesticides

Adding any chemicals to the soil, can have far-reaching
effects due to the fact that producers rely on soil for their growth. Therefore, any
added potassium or nitrates will fertilize the soil and enable plants to proliferate.
This in turn affects herbivores that use them for their food at that trophic level.
Increased herbivores means more food for carnivores, thus the entire food web in the
area is affected. Agrochemicals can also include fungicides, herbicides and
insecticides, to control pests. However, as water infiltrates the soil, it will also
have dissolved agrochemicals in it. Eventually, because water flows downhill due to
gravity, the water table will contain some of these chemicals. Thus, anyone pulling well
water out of the ground, could have levels of substances that may become toxic to human
health. Also, water flows eventually to rivers and oceans, and this may increase the
algae levels causing a bloom, and a subsequent die-off, eventually causing the oxygen
levels to decrease as bacterial decomposition increases. For every action, there is
always a trade-off.