Fertile soil is inhabited by the root systems of higher
plants, many animal forms (e.g., rodents, insects and
worms), and by tremendous numbers of microorganisms.
Usually, the density of organisms is less in cultivated soil
than uncultivated/virgin land and population decreases
with soil acidity. The bacterial population of the soil
exceeds the population of all other groups of
microorganisms in both number and variety.
In modern agricultural production, herbicide application
is a regular practice. The problems caused by the
increased application of herbicides call for
multidisciplinary approach (Dobrovoljskiy and Grishina,
1985).