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Spraying Solutions Other Than Water
The calculations in this section are based on spray-
ing water, which weighs 8.34 pounds per U.S. gal-
lon. The conversion factors in the table must be
used when spraying solutions which are heavier or
lighter than water. In order to determine the proper
size nozzle for the solution to be sprayed, multiply
the desired GPM or GPA of solution by the water
rate conversion factor. Then use the new con-
verted GPM or GPA rate to select the proper size
nozzle.
Density Conversion Table
Weight of Solution Conversion
Solution Specific Factor
(lbs./Gal.) Gravity
7.00 .84 .92
7.50 .90 .95
8.00 .96 .98
8.34 (Water) 1.00 1.00
8.50 1.02 1.01
9.00 1.08 1.04
9.50 1.14 1.06
10.00 1.20 1.10
10.50 1.26 1.12
10.65 (Nitrogen 28%) 1.28 1.13
11.00 1.32 1.15
11.50 1.38 1.18
12.00 1.44 1.20
14.00 1.68 1.30
EXAMPLE Calculation for spraying nitrogen:
It is desired to apply 34 GPA (gallons per acre) of
nitrogen in 20” rows. (28% N, density if 10.65 ib/
gal from the chart above)
From the Density Conversion Table, we find the
conversion factor for 28% nitrogen is 1.13.
GPA (Solution) x Conversion Factor = GPA
(34 gal/acre) (1.13) = 38.42 gal/acre on the
nozzle charts.
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