Precautions to be taken while preparing fertilizer mixtures (Jun 16, 2017)

  • Do not mix the fertilizer containing ammonia like Ammonium Sulphate with basically reactive fertilizers like lime, basic slag, Rock Phosphate and Calcium Cyanide as losses of Nitrogen may result through escape of gaseous ammonia.
  • Do not mix water soluble phosphate fertilizer with the fertilizer containing free lime like basic slag, Calcium Cyanide etc. as this converts the portion of insoluble phosphate into soluble phosphate.
  • Do not mix fertilizers which are easily soluble and hygroscopic like urea, Calcium Ammonium Nitrate with other fertilizers because they will form lumps. The fertilizer mixtures are made manually or in the factory, having the grades 6:12:0, 12:6:0, 9:9:0, 9:9:5, 15:5:5, 10:5:5, etc.

One percent of Nitrogen, Phosphorus or Potassium present in one tonne of a fertilizer is treated as one unit. A unit is thus equal to 10kg. The unit value of plant food in a fertilizer is the price of one tonne of fertilizers divided by the percentage content of that nutrient. The fertilizer having a lower unit value will be cheaper than a fertilizer having a higher unit value. 

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