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It is important to know how much actual nutrient is being applied when planning accurate turf fertiliser input. Detailed below are the calculations, with examples, for granular, soluble and liquid fertilisers.

Granular Fertilisers

To calculate the kg of nutrient applied per hectare:
Application rate in g per m² x % nutrient content
                               10

Example:

An application of Impact 6-5-18 Fine Turf Fertiliser applied at 25 g per m²:
25 x 6 ÷ 10 = 15 kg/ha Nitrogen (N)
25 x 5 ÷ 10 = 12.5 kg/ha Phosphate (PO)
25 x 18 ÷ 10 = 45 kg/ha Potash (KO)

Soluble Fertilisers

To calculate the kg of nutrient applied per hectare:
Application rate in kg per ha. x % nutrient content
                              100

Example:

An application of Fusion Soluble 20-7-20 applied at 10 kg per ha:
10 x 20 ÷ 100 = 2 kg/ha Nitrogen (N)
10 x 7 ÷ 100 = 0.7 kg/ha Phosphate (PO)
10 x 20 ÷ 100 = 2 kg/ha Potash (KO)

Liquid Fertilisers

Historically, to calculate the amount of nutrient applied by a liquid it was necessary to know the specific gravity. Now all Indigrow liquids are labelled with the nutrient content by volume so it becomes just a straight forward multiplication, the same as for soluble fertilisers To calculate the kg of nutrient applied per hectare:
Application rate in lt per ha. x % w/v nutrient
                              100

Example:

An application of Fusion BioGreen 18-9-9 applied at 40 litres per ha
40 x 18 ÷ 100 = 7.2 kg/ha Nitrogen (N)
40 x 9 ÷ 100 = 3.6 kg/ha Phosphate (PO)
40 x 9 ÷ 100 = 3.6 kg/ha Potash (KO)

Conversion Factors

Different countries adopt different ways of expressing nutrients - either the oxide form (e.g. PO5) or elemental (e.g. P).

All Indigrow products carry dual labelling:

PO convert to P = x 0.43       P convert to PO = x 2.29
KO convert to K = x 0.83        K convert to KO = x 1.2
CaO convert to Ca = x 0.72      Ca convert to CaO = x 1.4
MgO convert to Mg = x 0.6      Mg convert to MgO = x 1.6
SO convert to S = x 0.4          S convert to SO = x 2.5

  
  
  
  
  

 

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