What are fertilizers? Classify fertilizers.
Fertilizers - Fertilizers are one of the major component s for obtaining higher yields especially in expensive farming practices. Fertilizers are divided into folloewing four groups :
(i) Nitrogenous fertilizers :These fertilizers supply the macronutrient nitrogen.
Example - Urea, CO (NH2)2
(ii) Potassic ferilizers - These fertilizers supply pota ssium 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