Brassica Crops (Broccoli, Brussel sprouts, Cabbage, Cauliflower)

Nitrogen

Table XX. Brassica Crop Nitrogen Recommendations
Soil Type Actual N
kg/ha
Broccoli, Cauliflower,
Brussels Sprouts		 Cabbage Horseradish,
Kale, Kohlrabi
Mineral Soils1
Preplant 100 130 80
Side-dress2 30 40 30
   Total 130 170 110
Muck Soils
Preplant 70 100 70
1st side-dress 30 30 30
2nd side-dress 30 30 30
   Total 130 160 130
1  If rainfall is excessive, an additional 40 kg of nitrogen/ha may be side-dressed on sandy soils.

2  3 weeks after field setting.

Phosphorus and Potassium

Test the soil to determine phosphorus and potassium requirements.

Table X, Phosphorus and Potassium Requirements for Brassica Crops[1] 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 270 0-15 HR 270
4-5 HR 260 16-30 HR 250
6-7 HR 250 31-45 HR 230
8-9 HR 240 46-60 HR 200
10-12 HR 230 61-80 HR 170
13-15 HR 220 81-100 HR 130
16-20 HR 200 101-120 MR 100
21-25 HR 170 121-150 MR 80
26-30 MR 140 151-180 MR 50
31-40 MR 110 181-210 LR 0
41-50 MR 80 211-250 RR 0
51-60 LR 50 >250 NR 0
61-80 RR 0  
80+ NR 0  
For transplanted broccoli, Brussel sprouts, cabbages, and cauliflower, if no insecticide is used in the planting water, apply a starter solution high in nitrogen such as 20-20-20 at 1 kg/200 L. Under high temperatures and In dry, sandy soils, use half the concentration of fertilizer.

 

Table X, Phosphorus and Potassium Requirements for Brassica Crops[2] 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 200
4-5 HR 100 16-30 HR 190
6-7 HR 100 31-45 HR 170
8-9 HR 100 46-60 HR 150
10-12 MR 90 61-80 MR 120
13-15 MR 90 81-100 MR 90
16-20 MR 80 101-120 MR 70
21-25 MR 70 121-150 MR 50
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  
For transplanted broccoli, Brussel sprouts, cabbages, and cauliflower, if no insecticide is used in the planting water, apply a starter solution high in nitrogen such as 20-20-20 at 1 kg/200 L. Under high temperatures and In dry, sandy soils, use half the concentration of fertilizer.

[1] Broccoli, Brussel sprouts, Cabbage, Cauliflower

[2] Broccoli, Brussel sprouts, Cabbage, Cauliflower