Soil is made up of

Soil consists of nutrients required for plant growth are

If the pH level of soil is below 7 then the soil is

Major microbial groups in soil are

The process of converting organic forms of elements to their inorganic forms by soil microorganisms is known as

A major part of the soil microbial biomass is composed of

Waste substances that can be degraded by microbes into harmless and non-toxic substances are

Excessive potassium content in soil decreases vitamin C and carotene content in

The first widespread insecticide used is

The process of increasing concentration of chemicals through the food chain is known as