ARCHIVE: Fertiliser Manual (RB209)

Brussel Sprouts and Cabbage

 

SNS, P, K or Mg Index

 
 

0

1

2

3

4

5

 6

 

kg/ha

 
Nitrogen (N)b - all soil types

 

 

 

 

 

 

 

Brussel spouts

330

300

270

230

180

80

0a

Storage cabbage

340 

310

280 

240 

190 

 90

0a

Head cabbage pre-December 31st

325 

290

260

220 

 170

 70

0a

Head cabbage - post-December 31st

240

210

180

140

90

0a

0a

Collards pre-December 31st

210

190

180

160

140

90

0a

Collards post-December 31st

310

290

270

240

210

140

90 

Phosphatec (P2O5), all crops

200

150

100

50

0

0

0

Potashc (K2O), all crops

300

250

200 (2-)
150 (2+)

60

0

0

0

Magnesium (MgO), all crops

150

100

0

0

0

0

0

a. A small amount of nitrogen may be needed if there is little mineral nitrogen in the 0-30 cm of soil.
b. Nitrogen – On light soils where leaching may occur or when crops are established by direct seeding no more than 100 kg N/ha should be applied prior to seeding or transplanting. On retentive soils in drier parts of the country where leaching risk is low and spring planted brassicas are established from modules, more nitrogen can be applied prior to planting. The remainder of the nitrogen requirement should be applied after establishment but before the surface soil dries out to ensure that it is utilised by the crop.
c. Phosphate and potash requirements are for average crops and it is important to calculate specific phosphate and potash removals based on yields especially for the larger yielding cabbage crops (see ‘Fertiliser Use for Vegetables’ above and Section 1).

Storage cabbage

For storage cabbage grown on fertile soils the recommendations for nitrogen may need to be decreased in order to reduce the risks of storage losses.

Post-December 31st crops

Apply no more than 100 kg N/ha at sowing or transplanting, less if there is risk of frost damage. The remaining nitrogen should be applied to reflect crop growth. Further top dressings of nitrogen will depend on the harvest date and expected yield – some nitrogen will be required to support growth during the winter particularly for crops harvested in late winter. For crops harvested in late spring more of the top-dressing should be left until the beginning of regrowth in spring.

Sulphur

Consider applying up to 50 kg SO3/ha in situations where sulphur content of soils is low, i.e on light soils following wet winters where there is no history of organic manure application.

Don’t forget to:

  • make allowance for nutrients applied in organic manures (see Section 2)
  • ensure the phosphate and potash offtake is balanced by application on Index 2 soils and check that the soil is maintained at Index 2 by soil sampling every 3 – 5 years
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