Fertilizers are grouped in different groups according to different basis which are as follows:

•According to way of action:

Straight fertilizers- These fertilizers contain mostly one or the other nutrient and supply directly to the plant.

Auxillary fertilizers-These fertilizers by affecting the environment metabolism of the plant provide them nutrients. They do not provide direct nutrients.

•According their phase-

Liquid fertilizers- Some fertilizers come in liquid phase. These are considered as liquid fertilizers.

Solid fertilizers- These fertilizers come in powdered granular form and are considered as solid ones.