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
Hardy DH, Tucker MR, Stokes CE. 2013. 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
February 15, 2013
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
