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.

Disclaimer:  The use of brand names and any mention or listing of commercial products or services in this publication does not imply endorsement by North Carolina State University nor discrimination against similar products or services not mentioned. NCSU and NC A&T State University commit themselves to positive action to secure equal opportunity regardless of race, color, creed, national origin, religion, sex, age, veteran status, or disability. In addition, the two Universities welcome all persons without regard to sexual orientation. NCSU, NC A&T State University, USDA, and local governments cooperating.