Fertilizer is nutrients for the soil . It is a substance that contains plant nutrients that are added to the environment around a plant. Usually, fertilizer is added to soil or water, but some fertilizers can also be sprayed directly onto plant leaves, or into the air.
Top soil
Topsoil is the upper surface of the Earth's crust, and usually is no deeper than approximately eight inches (20 centimeters). The Earth's topsoil mixes rich humus with minerals and composted material, resulting in a nutritious substrate for plants and trees. It may one of the Earth's most vital resources, because it represents a delicate nutritional balance that provides food for many of the animals on Earth, either directly in the form of plant material or indirectly in the form of products from animals that eat plants.
