ARCHIVE: Fertiliser Manual (RB209)

Asparagus

 

SNS, P, K or Mg Index

 

0

1

2

3

4

5 +

 

kg/ha

Establishment year
Nitrogen (N) - all soil types

150

150

150

90

20

0

Phosphate (P2O5)

175

150

125

100

75

0

Potash (K2O)

250

225

200

150

125

0

Subsequent years 
Nitrogen (N) - year 2, all soil type

See note below

Nitrogen (N) - other years, all soil types

See note below

Phosphate (P2O5)

75

75

50

50

25

0

Potash (K2O)

100

50

50

50

0

0

Magnesium (MgO)

150

100

0

0

0

0

Establishment year – nitrogen

Apply one third of the total nitrogen dressing before sowing or planting, one third when the crop is fully established (around mid June for crowns, mid July for transplants) and one third at the end of August.

Subsequent years – nitrogen

In year 2, apply 120 kg N/ha by end-February – early March.
In subsequent years, the amount and timing of nitrogen depends on the previous winter. If the crop is on light soil and over-winter rainfall was high, apply 40 – 80 kg N/ha by the end of February with an additional 40-80 kg N/ha applied after harvest.

Following moderate or low amounts of winter rainfall apply 40-80 kg N/ha just after the harvest to provide nitrogen for fern growth.

Where SMN is measured, top up with fertiliser nitrogen to achieve a target of 120 kg N/ha of mineral nitrogen in the top 30 cm of soil during the cropping period.

Sodium

Asparagus can respond to applied sodium. Apply up to 500 kg Na2O /ha per year at the end of June but not in the establishment year.

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
ADLib logo Content provided by the Agricultural Document Library
© University of Hertfordshire, 2011