What are fertilizers? Classify fertilizers.

Fertilizers - Fertilizers are one of the major components for obtaining higher yields especially in expensive farming practices. Fertilizers are divided into following four groups:

(i) Nitrogenous fertilizers - These fertilizers supply the macronutrient nitrogen.

Example - Urea, CO(NH2)2

(ii) Potassic fertilizers - These fertilizers supply potassium which is one of the essential macronutrient of the plants.

Example - Potassium sulphate, K2SO4.

(iii) Complex fertilizers - These fertilizers contains two or more nutrients.

Example – Nitrophosphate