Fertilizer Terminology

SSC 151



  A fertilizer is any substance that is added to the soil to supply those elements required in the nutrition of plants.
  A fertilizer material or carrier is any substance that contains one or more of the essential elements.
  A mixed fertilizer is a mechanical or chemical combination of two or more fertilizer materials and which contains two or more essential elements.
A complete fertilizer contains the three major plant-nutrient elements - nitrogen, phosphorus, and potassium.
  Fertilizer grade refers to the minimum guarantee of the plant-nutrient content in terms of total nitrogen, available phosphorus pentoxide, and soluble potassium oxide (6-24-24 for example).
  Fertilizer ratio refers to the relative percentages of nitrogen, phosphorus pentoxide, and potassium oxide (a 6-24-24 grade has a 1-4-4 ratio).
  A filler is make-weight material added to a mixed fertilizer of fertilizer material to make up the difference between the weight of the added ingredients required to supply the plant nutrients in a ton of a given analysis and 2,000 lbs.
  Dry bulk blending is the process of mechanically mixing solid fertilizer material.
  Clear liquid fertilizer is one in which the NPK and other materials are completely dissolved.

Conversion factors :

%P x 2.29 = %P2O5
% P2O5 x 0.44 =%P
%K x 1.2 = %K2O
%K2O x 0.83 = %K

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