ARCHIVE: Fertiliser Manual (RB209)

Barley, winter sown – Nitrogen

  SNS Index
  0 1 2 3 4 5 6
  kg N/ha
Feed barley
Light sand soils 150 120 90 60 30-60 0-30 0
Shallow soils 210 190 150 120 60 20-60 0-20
Medium and deep clay soils 190 170 140 110 60 20-60 0-20
Deep fertile silty soils 160 140 110 70 30 0-20 0
Organic soils       110 60 0-40 0
Peaty soils           0-40
Malting barley (up to 1.8% grain N)
Light sand soils 120 80 40 0-40 0 0 0
Other mineral soils 160 130 100 70 0-40 0 0
Organic soils       70 0-40 0 0
Peaty soils           0

Nitrogen – feed barley

There is no requirement for seedbed nitrogen.

Where the total nitrogen rate is less than 100 kg N/ha, apply this amount as a single dressing by early stem extension, but not before late March.

Where the total nitrogen rate is 100 kg N/ha or more, split the dressing with 40 kg N/ha in mid-February/early March and the rest by early stem extension, but not before late March.

These recommendations assume appropriate measures are taken to control lodging (e.g. choice of variety, use of plant growth regulator). Reduce the recommendation by 25 kg N/ha if the lodging risk is high.

Nitrogen – malting barley

Careful judgement of the nitrogen rate is important to ensure that the grain nitrogen concentration is neither too high nor too low for the requirement of the target market. Previous experience and consultation will be important in deciding the nitrogen rate to use. Where quality premiums are expected to be low, applying a slightly higher nitrogen rate will maximise the yield potential of the crop.

On light sand soils, the recommended rate assumes that the grain yield will be no more than 6.0-6.5 t/ha. Low yields are normal on these soils due to summer drought stress. Where there is a realistic expectation of a yield greater than this, the nitrogen recommendation for light sand soils may be increased by 10-20 kg N/ha.

Where the total nitrogen rate is 100 kg N/ha or more, split the dressing with 40 kg N/ha in mid February-early March and the rest by end March. Where the nitrogen rate is below 100 kg N/ha, apply a single dressing by end-March.

Where the target grain %N is below 1.8%, the nitrogen rate may need to be reduced by up to 30 kg N/ha taking account of previous farm experience. This nitrogen should all be applied by mid March.

The effect of economic changes on nitrogen rates

The recommendations in the table are based on a breakeven ratio of 5.0 (see page 32). If the price of nitrogen or the price of grain changes, use the winter sown wheat table above to decide on an amount to add to or subtract from the nitrogen application.

Don’t forget to deduct nutrients applied as organic manures (see Section 2)

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