Liquid Nitrogen Calibration Information

— Written By Curtis Fountain and last updated by
To: Duplin Co. Tobacco Interests

From: Curtis D. Fountain

           Agricultural Extension Agent – Field Crops

Many tobacco operations utilize ground-driven pumps for liquid nitrogen application. Hopefully the following information will be helpful for the calibration process.

The following distances translate to 1/128th of an acre:
48-inch row – 85 feet
46-inch row – 89 feet
44-inch row – 93 feet
42-inch row – 97 feet

Catch the output (1 row) for the above distance. Fluid ounces caught will translate directly to gallons per acre. Since water is used for the calibration process and nitrogen is heavier than water, a conversion factor is needed.

For example if you caught 15 ounces of water which would translate to 15 gallons/acre of water, the conversion factor depends on the weight of the liquid nitrogen product.

If it is 32% N, the conversion factor is 1.15. So 15 gallons/acre of water divided by 1.15 equals 13.0 gallons/acre of 32% N.

If it is 30% N, the conversion factor is 1.14. So 15 gallons/acre of water divided by 1.14 equals 13.2 gallons/acre of 30% N.

If it is 24S or 25S, the conversion factor is 1.13. So 15 gallons/acre of water divided by 1.13 equals 13.3 gallons/acre of 24S or 25S.

32% N weighs 11.1 lbs/gallon and contains 3.6 lbs of nitrogen per gallon.

30% N weighs 10.8 lbs/gallon and contains 3.3 lbs of nitrogen per gallon.

24S or 25S weighs 10.7 lbs/gallon and contains 2.6 lbs of nitrogen per gallon. 24S or 25S also contains 0.3 lb of sulfur per gallon.

Please call if you have questions.

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Written By

Photo of Curtis FountainCurtis FountainExtension Agent, Agriculture - Field Crops (910) 296-2143 (Office) curtis_fountain@ncsu.eduDuplin County, North Carolina
Posted on Apr 24, 2014
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