Chapter : 3. Improvement In Food Resources
Fertilizers Types
(i) Nitrogenous Fertilizers :
The important nitrogenous compounds used as fertilizers are :
Ammonium sulphate, (NH4)2SO4
Calcium cyanamide, CaCN2
Calcium ammonium nitrate, Ca(NO3)2, NH4NO3
Basic calcium nitrate, Ca(NO3)2, CaO
Urea, (NH2–CO–NH2)
(ii) Phosphatic Fertilizers :
The minerals of phosphorus such as phosphorite, [Ca3(PO4)2] and apatire, [3Ca3(PO4)2 CaF2] are sparingly soluble in water and thus do not serve as source of phosphorus for plants. These are, therefore, converted into soluble materials which can act as good fertilizers. The important phosphatic fertilizers are :
Calcium superphosphate
Nitrophosphate
Triple phosphate
Phosphatic slag
(iii) Potash Fertilizers :
Potassium nitrate, potassium chloride and potassium sulphate are used as fertilizers.
(iv) NPK Fertilizers :
Fertilizers containing N, P and K in suitable adjusted proportions are known as NPK fertilizers. These are obtained by mixing nitrogenous, phosphatic and potash fertilizers in suitable proportions.
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