Soil is necessary for life because most of our foods come from soil . It is true that some of us eat meat . But meat comes from animals that live on plants which again grow on soil . If we do not give food to soil , plants will become weak . Therefore natural and inorganic manure are necessary for cultivation . Nowadays compost manure is widely used in cultivation . Moreover agriculture scientists discourage the farmers to use pesticides, and they opt for a method of catching pests in traditional way . But it is not so popular .