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Crop Fertilization Based on North Carolina Soil Tests
Table 4.6  Fertilizer dilutions necessary (oz/100 gal. water) to deliver
parts-per-million (ppm) rates *
ppm
soln.
Percent Element in Fertilizer
10 13 15 16 18 20 25 30 33.5 46 50
50 6.7 5.1 4.4 4.2 3.7 3.3 2.7 2.2 2.0 1.5 1.3
100 13.3 10.3 8.9 8.3 7.4 6.7 5.3 4.4 4.0 2.9 2.7
125 16.6 12.8 11.1 10.4 9.3 8.3 6.7 5.6 5.0 3.6 3.3
150 20.0 15.4 13.3 12.5 11.1 10.0 8.0 6.7 6.0 4.3 4.0
175 23.3 17.9 15.6 14.6 13.0 11.7 9.3 7.8 7.0 5.1 4.7
200 26.7 20.5 17.8 16.7 14.8 13.3 10.7 8.9 8.0 5.8 5.3
250 33.3 25.6 22.2 20.8 18.5 16.7 13.3 11.1 10.0 7.2 6.7
300 40.0 30.8 26.7 25.0 22.2 20.0 16.0 13.3 11.9 8.7 8.0
350 46.7 35.9 31.1 29.2 25.9 23.3 18.7 15.6 13.9 10.1 9.3
400 53.3 41.0 35.6 33.3 29.6 26.7 21.3 17.8 15.9 11.6 10.7
450 60.0 46.2 40.0 37.5 33.3 30.0 24.0 20.0 17.9 13.0 12.0
* Equivalent units: 1.0 lb = 454 g = 16 oz; 1.0 oz = 28.38 g.
The equation for calculating the amount of fertilizer to mix in 100 gallons of water is shown below:
                      ppm of desired element ÷ percent of element × 0.75 = oz/100 gal.
return icon.Hardy DH, Tucker MR, Stokes CE. 2014. Crop fertilization based on North Carolina soil tests. Raleigh (NC): North Carolina Department of Agriculture and Consumer Services, Agronomic Division. Circular No. 1.

Last Update January 10, 2014

 

NCDA&CS Agronomic Services Division, Colleen M. Hudak-Wise, Ph.D., Director
Mailing Address: 1040 Mail Service Center, Raleigh NC 27699-1040
Physical Address: 4300 Reedy Creek Road, Raleigh NC 27607-6465
Phone: (919) 733-2655; FAX: (919) 733-2837



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