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