Table of Contents
Potato Nitrogen Recommendations
Soil |
Actual N kg/ha |
Expected Marketable Yield (t/ha) |
Expected Marketable Yield |
Mineral Soil |
50 |
15 | 120 |
75 |
20 | 160 | |
130 |
25 |
200 |
|
200 | 30+ |
240+ |
|
Mineral Soil |
70 | — |
— |
Muck Soil |
up to 60 | — |
— |
Table XX. Potato Nitrogen Recommendations | |||
Soil | Actual N kg/ha |
Expected Marketable Yield (t/ha) |
Expected Marketable Yield (cwt/acre) |
Mineral Soil main crop |
50 | 15 | 120 |
75 | 20 | 160 | |
130 | 25 | 200 | |
200 | 30+ | 240+ | |
Mineral Soil early crop |
70 | — | — |
Muck Soil early and main crop |
up to 60 | — | — |
Phosphorus and Potassium
Test the soil to determine phosphorus and potassium requirements.
Phosphorus and Potassium Requirements for Potatoes on Mineral Soils |
|||||
Legend: HR = High Response MR = Medium Response LR = Low Response RR = Rare Response NR = No Response | |||||
Phosphorus | Potassium | ||||
Sodium Bicarbonate Phosphorus Soil Test (ppm) | Rating | Phosphate (P205) Required kg/ha | Ammonium Acetate Potassium Soil Test (ppm) | Rating | Potash (K2O) Required (kg/ha) |
0-3 | HR | 200 | 0-15 | HR | 230 |
4-5 | HR | 200 | 16-30 | HR | 220 |
6-7 | HR | 190 | 31-45 | HR | 210 |
8-9 | HR | 190 | 46-60 | HR | 190 |
10-12 | HR | 180 | 61-80 | HR | 160 |
13-15 | HR | 170 | 81-100 | HR | 130 |
16-20 | HR | 160 | 101-120 | MR | 100 |
21-25 | MR | 140 | 121-150 | MR | 80 |
26-30 | MR | 120 | 151-180 | MR | 50 |
31-40 | MR | 90 | 181-210 | LR | 0 |
41-50 | MR | 50 | 211-250 | RR | 0 |
51-60 | LR | 30 | >250 | NR | 0 |
61-80 | LR | 30 | |||
80+ | LR | 30 |
Phosphorus and Potassium Requirements for Potatoes on Muck Soils |
|||||
Legend: HR = High Response MR = Medium Response LR = Low Response RR = Rare Response NR = No Response | |||||
Phosphorus | Potassium | ||||
Sodium Bicarbonate Phosphorus Soil Test (ppm) | Rating | Phosphate (P205) Required kg/ha | Ammonium Acetate Potassium Soil Test (ppm) | Rating | Potash (K2O) Required (kg/ha) |
0-3 | HR | 100 | 0-15 | HR | 230 |
4-5 | HR | 100 | 16-30 | HR | 220 |
6-7 | HR | 100 | 31-45 | HR | 210 |
8-9 | HR | 100 | 46-60 | HR | 200 |
10-12 | MR | 90 | 61-80 | MR | 170 |
13-15 | MR | 90 | 81-100 | MR | 150 |
16-20 | MR | 80 | 101-120 | MR | 120 |
21-25 | MR | 70 | 121-150 | MR | 80 |
26-30 | MR | 60 | 151-180 | MR | 40 |
31-40 | LR | 50 | 181-210 | LR | 0 |
41-50 | LR | 30 | 211-250 | RR | 0 |
51-60 | LR | 20 | >250 | NR | 0 |
61-80 | RR | 0 | |||
80+ | NR | 0 |