Conversions factors

Conversion factors - Nutrients as % of product

 
Products
  
N
  
P2O5
  
K2O
  
S
  
MgO
  
 
Nitrogen fertilizers 		                     
  Ammonia   82,2   -   -   -   -  
  Urea   46   -   -   -   -  
  Ammonium nitrate   33,5*
32-34,5 		  -   -   -   -  
  Calcium ammonium nitrate   27*
26-30 		  -   -   -   -  
  Urea ammonium nitrate   30*
28-32 		  -   -   -   -  
  Ammonium chloride   25   -   -   -   -  
  Ammonium sulphate   21   -   -   24   -  
 
Phosphate fertilizers 		                     
  Phosphate rock   -   30,9   -   -   -  
  Phosphoric acid   -   100   -   -   -  
  MAP   11   52   -   -   -  
  DAP   18   46   -   -   -  
  TSP   -   46   -   -   -  
  SSP   -   15   -   12   -  
 
Potash fertilizers 		                     
  Potassium chloride   -   -   60   -   -  
  Potassium sulphate   -   -   50   18   -  
  Potassium magnesium sulphate   -   -   22- 30   17-22   10-11  
 
Complex fertilizers 		                     
  NPK fertilizers   5-25   5-25   2-25   ***   ***  
  NP fertilizers   15-25   15-25   -   ***   -  
  NK fertilizers   13-25   -   15-46   ***   -  
  PK fertilizers   -   7-30   10-30   ***   ***  
                         
  Sulphur   -   -   -   100   -  
 
Magnesium fertilizers 		                     
  Kieserite   -   -   -   20-22   25-27  
  Epsom salts   -   -   -   12-13   15-16  

* Average grade - *** some with S and/or Mg and/or micronutrients

 

Area and distance

  

Weight

  
  1 hectare (ha) = 2.471 acres
1 meter = 1.0936 yards
1 acre = 4480 sq. yards
1 acre = 0.4047 hectare
1 yard = 0.9144 metre 		  1 kilogram (kg) = 2.2046 pounds
1 kg/ha = 0.9822 lb/acre
1 metric tonne = 1.1023 short tons (2000 lb)
1 metric tonne = 0.9842 long ton (2240 lb)
1 pound (lb) = 0.4536 kilogram
1 lb/acre = 1.1208 kg/ha 		 
         
 

Cereals

  

Fertilizers

  
  1 bushel wheat (U.S.)= 60 lb = 27.215 kg
1 bushel maize (U.S.)= 56 lb = 25.410 kg 		  Phosphorus
To change P2O5 (phosphate) to P
multiply P2O5 by 0.4364

To change P to P2O5
multiply P by 2.2914

Potassium
To change K2O (potash) to K
multiply K2O by 0.8302

To change K to K2O
multiply K by 1.2046 		 
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