ARCHIVE: Fertiliser Manual (RB209)

Soft Fruit and Vines – Established Plantations

For bush and cane fruits, nitrogen rates may need to be modified depending on the amount of annual growth required for a particular production system. When nitrogen is deficient, leaves tend to be small and pale green. Nitrogen should not be applied to raspberries after the end of July to avoid excessive growth of soft cane. However, when nitrogen is being applied at lower rates through fertigation, applications may continue up until the end of August. For blackcurrants, fertiliser should be applied to bare soil only or at rates increased to compensate for the grass.

For crops which are establishing prior to reaching full crop potential, smaller rates of nitrogen are usually adequate. The rate should be adjusted according to the amount of growth required and the results of leaf nitrogen analysis.

For established crops, the timing of phosphate, potash and magnesium applications is not critical.

Soft fruit and vines – nitrogen

 

kg/ha

Blackcurrants
Light sand and shallow soils

160

Deep silty soils

110

Clays

120

Other mineral soils

140

Redcurrants, Gooseberries, Raspberries, Logan berries, Tayberries, Blackberriesa
Light sand and shallow soils

120

Deep silty soils

70

Clays

80

Other mineral soils

100

Vinesb
Light sand and shallow soils

60

Deep silty soils

0

Clays

20

Other mineral soils

40

a. With continuing change in varieties, adjust nitrogen rates depending on plant vigour.
b. Excessive growth of vines will cause wood to ripen slowly and a yield reduction in the following crop. Reduce nitrogen rates where growth is excessive.

Soft fruit and vines – phosphate and potash

 

SNS, P, K or Mg Index

 

0

1

2

3

>4

P mg/l (Olsen's)

0-9

10-15

16-25

26-45

>46

K mg/l

0-60

61-120

121-240

241-400

>401

Mg mg/l

0-25

26-50

51-100

101-175

>176

kg/ha

Blackcurrants, Redcurrants, Gooseberries, Raspberries, Logan berries, Tayberries
Phosphate (P2O5)

110

70

40

40

0

Potash (K2O)

250a

180a

120

60

0

Blackberries, Vines

Phosphate (P2O5)

110

70

40

40

0

Potash (K2O)

220

150

80

0

0

All crops
Magnesium (MgO)

100

65

50

0

0

a. Sulphate of potash should be used for raspberries, redcurrants and gooseberries where more than 120 kg K2O/ha is applied.

For phosphate fertilisers, use only those that contain a large proportion of water-soluble phosphate.

To avoid inducing magnesium deficiency, the soil K: Mg ratio (based on soil mg/litre K and Mg) should be no greater than 3:1.

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

 

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