ARCHIVE: Fertiliser Manual (RB209)

Barley, spring sown – Nitrogen


  SNS Index
  0 1 2 3 4 5 6
  kg N/ha
Feed
Light sand soils 110 80 50 30 0-30 0 0
Other mineral soils 160 140 110 70 30 0-30 0
Organic soils       70 30 0-30 0
Peaty soils           0-30
Malting barley (up to 1.8% grain N)
Light sand soils 100 70 40 0.-40   0 0
Other mineral soils 140 12 80 50 0-40 0 0
Organic soils       50 0-40 0 0
Peaty soils           0

Nitrogen – feed barley

For crops drilled before March, apply nitrogen at early stem extension but not before early April or after early May. For amounts greater than 70 kg N/ha, apply 40 kg N/ha of the total in the seedbed except on light sand soils. On these soils apply 40 kg N/ha at the 3 leaf stage but not before March.

For late-drilled crops, all the nitrogen can be applied in the seedbed except on light sand soils where amounts greater than 70 kg N/ha should be split with 40 kg N/ha in the seedbed and the remainder by the 3 leaf stage.

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, use of a slightly higher nitrogen rate will maximise the yield potential of the crop.

Apply all the nitrogen by early stem extension but not after end March. Where the target grain %N is below 1.8%, the nitrogen rate may need to be reduced by up to 20-30 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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