Potatoes

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 —

—
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