Soil Fertility and Nutrient management (1+1)

IV. Secondary Nutrient Fertilizers

• Secondary elements are as important as primary elements because they help in uptake of primary elements by plants. They are required in very little quantity as compared to primary elements. The most important secondary nutrients are Ca, Mg and S. The fertilizers carrying secondary nutrients are;

  1. Calcium cyanamide(39.57% Ca)
  2. Calcium Ammonium Nitrate (8.0% Ca & 4.5% Mg)
  3. Calcium nitrate (1.5% Mg)
  4. Super phosphate (20.0% Ca)
  5. Bone meal (23.1% Ca)
  6 Limestone (32.58% Ca)
  7. Dolomite (20.0% Mg)
  8 Gypsum (29.40% Ca & 21.0% S)
  9. Potassium sulphate18.5% S & 0.6 to 0.9% Mg)
  10. Ammonium sulphate (24% S)