Fertilizer Calculations

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For your reference, we have provided the following industry standard fertilizer conversions and calculations. We hope that you and your staff find them useful:

Conversion Factors

Nutrients as a % of product:

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

Area of Distance
1 hectare (ha) = 2.471 yards
1 meter = 1.0936 yards
1 acre = 4480 sq. yards
1 acre = 0.4047 hectare
1 yard = 0.9144 metre

Weight
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

Fertilizer Phosphorous
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


Source: International Fertilizer Industry Association (IFA).