Calculation of the injection rate

1 ppm = 1 pound in 119,760 gallons

 

How to calculate injection rate? (metric measurements)

Injection rate (grams/hour) = Desired concentration (ppm) x Flow rate (m3/hr) / Nutrient concentration

For example, if you require 350 ppm of urea nitrogen in two hours of water on field, the flow rate is 50 m3/hr. Urea nitrogen = 46% of nitrogen:

Injection rate = 350 ppm x 50 m3/hr / 0.46 (Urea 46%) = 38,043 grams/hr or 38 kg/hr

 

How to check if the fertilizer is injected and reaching the plants?

Use an EC meter to check the delta between the water source EC and the dripper EC. The EC from the
dripper must be higher than that of the water source when fertilizer is injected.

 

Injection rate (IR), US Measurements

Injection rate (lbs/hr) = Desired concentration (ppm) x flow rate (gpm) x 0.05 / Nutrient concentration (whole %)

For example, if you require 350 ppm of urea nitrogen in two hours of water on field, the flow rate is 220 gpm.
Urea nitrogen = 46 % of nitrogen:

Injection rate = (350 ppm) x (220 gpm) x 0.05 / 46 (Urea 46%) = 83.7 lbs/hr

 

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