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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 

 

 

 
  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.