Table 7. Fertilizer recommendation based on soil test results. [1]
The following fertilizer rates are to be used only as guidelines. Research at the University of Kentucky and at the University of Tennessee indicates that there is no yield increase from using more than 60 lbs./acre K2O or 60 lbs./acre of P2O5 when soil test P and K levels are high.
|
Phosphorus |
|
|
Soil Test Reading |
Lbs Phosphate (P2O5) Needed/A |
|
Low (<30 lbs/A) |
181-240 |
|
Medium (31-60 lbs/A) |
61-180 |
|
High (61-80 lbs/A) |
1-60 |
|
Very High (>80 lbs/A) |
0 |
|
Potassium |
|
|
Soil Test Reading |
Lbs Potash (K2O) Needed/A |
|
Low (< 200 lbs/A) |
121-250 |
|
Medium (201-300 lbs/A) |
61-120 |
|
High (301-450 lbs/A) |
1-60 |
|
Very High (> 450 lbs/A) |
0 |
|
Basal nitrogen where tomatoes: |
Lbs Actual Needed/A |
|
1) Follow grass-legume or legume sod |
30 |
|
2) Follow grass sod |
50 |
|
3) Are grown on continually cropped land |
60 |
Supplemental
applications:
On bare ground
plantings, apply an additional 30 lbs. of nitrogen per acre as a sidedressing
when the first fruits are golf ball size. A second sidedress application of 30 lb. N
may also be desirable 2 or 3 weeks later depending on the crop's growing
condition. For plasticulture
with drip on medium-textured soils, apply all phophorus and potassium
requirements prior to laying plastic mulch.
See fertigation table for N application rates.
