write a short note on chemical fertilizers.
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Answer:
Chemical fertilizers are compounds containing high concentration of nutrients required for plant growth. Apart from the three main constituent elements, carbon, oxygen and hydrogen, plants require substantial quantity of nutrients. These nutrients are classified as primary nutrients, secondary nutrients, and micronutrients. The elements responsible for providing these nutrients .Generally fertilizer industry is engaged in the production of primary plant nutrients suitable for application in the soil. In nitrogenous fertilizers, nitrogen is present as ammoniacal nitrogen such as ammonium sulphate, ammonium chloride; nitrate nitrogen such as calcium ammonium nitrate in which both ammoniacal and nitrate nitrogen are present, and amide nitrogen such as urea.