NPK fertilizers are speacial fertilizers consists of three-major elements :nitrogen, phosphorus, and potassium.
NPK Rating is a system describing the amount of nitrogen, phosphorus, and potassium in a fertilizer
Minour Elements that be required in a small amounts during whole life cycle of plants
i.e. (Ca , Cu , Fe , Mg , Br , Zn , Mo ).
Unique Compinations of some essential major and minour elements
Special fertlizers Categories
Growth stimulators are biotic and abiotic elicitors that enhance natural plant defense mechanisms against pests and advires environmental conditions
soil amendments that improve soil characteristics to provide optimum conditions for plant growth and nutrients absorbtion
straight fertilizers mainly providing one or more of three major elements ( N , P, K )