Soil Fertility and Nutrient management (1+1)

I. Nitrogenous fertilizers

• There are 6 groups.

  a. Ammonium fertilizers
  i. Ammonium sulphate (NH4)2 SO4 – 20% N
  ii. Ammonium chloride : NH4Cl2 -24-26%
  iii. Ammonium phosphate : NH4H2 PO4 -20%N + 20% P2O5 or 16% N and 20% P2O5
  iv. Anhydrous ammonium (82%N)
  v. Ammonium solution- 20-25%N
  vi. Ammonium carbonate- 21-24%N
  vii. Ammonium bicarbonate- 17%N
  b. Nitrate fertilizers
  i. Sodium nitrate or Chilean nitrate : NaNO3 – 16%N
  ii. Calcium nitrate: CaNO3 – 15.5% N
  iii. Nitrophosphate
  c. Both Ammonium and nitrate fertilizers
  i. Ammonium nitrate: NH4NO3- 33-34%N
  ii. Calcium ammonium nitrate (CAN) – 25, 26 and 28% N
  iii. Ammonium sulphate nitrate (ASN) – 26%N
  d. Amide fertilizers
  i. Urea – 46% N
  ii. Calcium cyanamide- 21 %N
  iii. Urea phosphate
  iv. Urea sulphate
  e. Nitrogen solutions
  i. Anhydrous ammonia
  ii. Aqueous ammonia
  iii. Solution containing one or more of the following urea, ammonium nitrate, ammonia
  f. Slowly available nitrogenous fertilizers
  i. Urea formaldehyde compounds
  ii. Neem Cake coated Urea NCU
  iii. Lac Coated Urea(LCU)
  iv. Sulphur Coated Urea(SCU)
  v. Urea super granules (USG)
  vi. Prilled urea (PU)
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