Fertilizers, is a natural or artificial substance containing the chemical elements that improve growth and productiveness of plants. Fertilizers enhance the natural fertility of the soil or replace chemical elements taken from the soil by previous crops.
Soil fertility is the quality of a soil fertilizers can provide the balance to promote growth of plants when other factors (such as light, moisture, temperature, and soil structure) are available and favor by plants and their soil.
plants need at least 16 elements, of which the most important are carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur, potassium, calcium and magnesium.