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Crop Fertilization Based on North Carolina Soil Tests
Table 2.5 Rates of P2O5 or K2O to apply based on soil test index value and crop-specific equation *
Eq. # Soil Test Index
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
1 900 780 660 550 460 370 290 220 160 110 70 40 10 0 0 0
2 500 440 380 330 280 230 190 150 120 90 70 40 30 10 0 0
3 300 270 230 200 180 150 130 100 80 70 50 40 20 10 10 0
4 300 260 220 180 150 120 100 70 60 40 30 20 20 20 20 10–30
5 300 250 210 170 130 100 80 50 30 20 0 0 0 0 0 0
6 300 240 190 140 100 60 30 10 0 0 0 0 0 0 0 0
7 250 220 190 160 140 110 90 70 50 40 30 10 0 0 0 0
8 250 210 160 130 90 60 30 10 0 0 0 0 0 0 0 0
9 220 190 160 140 120 100 80 60 50 30 20 10 10 0 0 0
10 200 170 150 120 100 80 60 50 30 20 10 10 0 0 0 0
11 200 160 120 90 60 40 20 0 0 0 0 0 0 0 0 0
12 180 160 140 130 110 90 80 70 50 40 30 20 20 10 0 0
13 165 140 110 90 70 50 30 20 10 0 0 0 0 0 0 0
14 150 120 100 80 60 40 30 10 0 0 0 0 0 0 0 0
15 150 120 90 70 40 30 10 0 0 0 0 0 0 0 0 0
16 150 110 70 40 10 0 0 0 0 0 0 0 0 0 0 0
17 140 120 100 80 70 50 40 30 20 10 10 0 0 0 0 0
18 120 90 60 40 20 0 0 0 0 0 0 0 0 0 0 0
19 100 80 70 60 40 30 20 10 0 0 0 0 0 0 0 0
20 80 60 40 20 0 0 0 0 0 0 0 0 0 0 0 0
21 20.0 17.0 14.0 11.5 9.5 7.5 5.5 4.0 2.5 1.5 0.5 0 0 0 0 0
22 11.0 9.5 8.0 7.0 6.0 5.0 4.0 3.0 2.5 2.0 1.0 1.0 0.5 0 0 0
23 9.0 7.5 6.5 5.5 4.5 3.5 2.5 2.0 1.5 1.0 0.5 0 0 0 0 0
24 8.0 6.5 5.0 4.0 2.5 2.0 1.0 0 0 0 0 0 0 0 0 0
25 6.5 5.0 4.0 3.0 2.0 1.0 0.5 0 0 0 0 0 0 0 0 0

* Rates given for equations 1 through 20 are rounded to the nearest 10 lb/acre, and those for equations 21 through 25 to the nearest 0.5 lb/1000 ft². Equations are listed in Table 2.4

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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