Teagasc Crop Report

Nutrient Tables

Nutrient Tables

Monday 20th January 2020
(Updated Wednesday 26th February 2020)
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Nitrogen Tables

Nitrogen

Continuous tillage: - crops that follow short leys (1-4 years) or tillage crops

Nitrogen Index System

Index 1

Index 2

Index 3

Index 4

Cereals

Maize

 

 

 

 

 

 

 

 

 

Vegetables receiving

less than 200 kg/ha nitrogen

Sugar beet

Fodder beet

Potatoes

Mangels

Kale

Oil Seed Rape Peas, Beans

 

Leys (1-4 years)

grazed or cut and grazed

 

Swedes removed

 

Vegetables receiving

more than 200 kg/ha nitrogen

Swedes grazed in situ  

Table 10 SI No.  605 of 2017

Tillage crops that follow permanent pasture

Nitrogen index 

Index 1

Index 2

Index 3

Index 4

Any crop sown as the 5th or subsequent tillage crop following permanent pasture

Any crop sown as the 3rd or 4th tillage crop following permanent pasture. If original permanent pasture was cut only, use index 1

Any crop sown as the 1st or 2nd tillage crop following permanent pasture (see also Index 4). If original permanent pasture was cut only, use index 2

Any crop sown as the 1st or 2nd tillage crop following very good permanent pasture which was grazed only

Table 10 -SI No.  605 of 2017

Maximum fertilization rates of nitrogen on tillage crops

Crop Nitrogen Index
1
(kg/ha)
2
(kg/ha)
3
(kg/ha)
4
(kg/ha)
Winter Wheat1 210 180 120 80
Spring Wheat1, 2 160 130 95 60
Winter Barley1 180 155 120 80
Spring Barley1 135 100 75 40
Winter Oats1 145 120 85 45
Spring Oats1 110 90 60 30
Sugar Beet 195 155 120 80
Fodder Beet 195 155 120 80
Potatoes: Main Crop, > 120 days 250 190 170 140
Potatoes: Maincrop/seed, 90- 120 days 270 230 210 180
Potatoes: Maincrop/seed, 60 to 90 days 210 170 150 120
Potatoes: Salad, <60 days4 140 120 100 60
Maize 180 140 110 75
Field Peas/Beans 0 0 0 0
Oilseed Rape 225 180 160 140
Linseed 75 50 35 20
Swedes/Turnips 90 70 40 20
Kale 150 130 100 70
Forage Rape 130 120 110

90

  • 1 Where proof of higher yields is available, an additional 20kg N/ha may be applied for each additional tonne above the following yields;
    • Winter Wheat - 9.0 tonnes/ha Spring Wheat - 7.5 tonnes/ha
    • Winter Barley - 8.5 tonnes/ha Spring Barley - 6.5 tonnes/ha
    • Winter Oats – 7.5 tonnes/ha Spring Oats – 6.5 tonnes/ha
    • The higher yields shall be based on the best yield achieved in any of the three previous harvests, at 20% moisture content.
  • 2 Where milling wheat is grown under a contract to a purchaser of milling wheat an extra 30 kg N/ha may be applied

    3 Where malting barley is grown under a contract to a purchaser of malting barley, an extra 20 kg N/ha maybe applied where it is shown on the basis of agronomic advice that additional nitrogen is needed to address a proven low protein content in the grain

    4 Length of growing season

Table 16- SI No.  605 of 2017


Phosphorus Tables

Phosphorus

Phosphorus index system

Soil Phosphorus Index

Grassland

Soil Phosphorus Ranges (mg/l)

Other crops

Soil Phosphorus Ranges (mg/l)

1

0.0 – 3.0

0.0 - 3.0

2

3.1 – 5.0

3.1 - 6.0

3

5.1 – 8.0

6.1- 10.0

4

> 8.0

>10.0

Phosphorus index system (Table 11- SI No.  605 of 2017)

Maximum fertilization rates of phosphorus on tillage crops

Crop

Phosphorus Index

( kg/ha)1

2

(kg/ha)1

3

(kg/ha)1

4

(kg/ha)1

Winter Wheat2,5

45

35

25

0

Spring Wheat2

45

35

25

0

Winter Barley2,5

45

35

25

0

Spring Barley2

45

35

25

0

Winter Oats2,5

45

35

25

0

Spring Oats2

45

35

25

0

Sugar Beet

70

55

40

20

Fodder Beet

70

55

40

20

Potatoes: Main crop

125

100

75

50

Potatoes: Early

125

115

100

50

Potatoes: Seed

125

115

100


856

Potatoes: Salad

125

115

100

856

Maize

70

50

40

204

Field Peas

40

25

20

0

Field Beans

50

40

20

0

Oil Seed Rape

55

45

35

0

Linseed

35

30

20

0

Swedes/Turnips

70

60

40

40

Kale

60

50

30

0

Forage Rape

40

30

20

0

1 The fertilisation rates for soils which have more than 20% organic matter shall not exceed the amounts permitted for Index 3 soils.

2Where proof of higher yields is available, an additional 3.8kg P/ha may be applied on soils at phosphorus indices 1, 2, or 3 for each additional tonne above a yield of 6.5 tonnes/ha. The higher yields shall be based on the best yield achieved in any of the three previous harvests, at 20% moisture content.

3Where pH is greater than or equal to 7, 20kg P/ha may be applied on soils at phosphorus index 4

4Must be incorporated prior to or during sowing.

5For winter cereals on soils of P index 1 and 2, 20 kg of the maximum P fertilisation rate may be applied up to 31st October, which must be incorporated prior to or during sowing.

6 Where soil P levels above 15ppm no P fertiliser required.

Phosphorus advice for Cereals 

The P allowed as per SI 605, 2017 (see table below) is based on a reference yield of 6.5t/ha.  Where proof of higher yields is available an additional 3.8kg P can be applied for each 1ton above the reference yields of 6.5t/ha.  For example a 7.5t/ha crop of spring barley grown on a soil P index 3 is now allowed 28.8kgP/ha.

Soil P Index

 P (kg/ha)1,2

1

45

2

35

3

25

4

0

1 P rates shown above refer to recommended application rates of available fertiliser. Chemical fertiliser rates should be calculated by deducting the P contained in organic fertiliser applications from the rates shown in the above table

2The fertilisation rates for soils which have more than 20% organic matter shall not exceed the amounts permitted for Index 3 soils

Timing of P application

At soil P index 1 it is advisable that P be incorporated at or before sowing. At soil P indices 2-3, P can be incorporated prior to sowing. Restricted periods for fertiliser application as set out in SI 605 2017 must be respected.

P & K off takes in cereal crops (kg/ha) per tonne of grain yield

Crop Type

Straw Removed

Straw Not Removed

P

K

P

K

Winter Wheat / Barley

3.8

9.8

3.4

4.7

Spring Wheat / Barley

3.8

11.4

3.4

4.7

Oats

3.8

14.4

3.4

4.7

 


Potassium

Soil Potassium (K) for Mineral Soils

Soil Index

Potassium (K)

1

0 - 50

2

51 - 100

3

101 – 150

4

Above 150

 

Potassium (K/ha) advice for cereal crops (Straw Removed)

Soil K Index

Winter Wheat1,2

Spring Wheat1,2

 

Winter / Spring Barley1,2

Winter Oats1,3

Spring Oats1,3

1

140

130

115

160

140

2

125

115

100

145

125

3

110

100

85

130

110

4

0

0

0

0

0

1Assumed crop yields:

Winter wheat = 11 t/ha     Spring wheat = 8.5 t/ha

Winter Barley = 8.5 t/ha   Spring Barley = 7.5 t/ha

Winter oats = 9.0 t/ha      Spring Oats = 7.5 t/ha

2 For wheat and barley crops: increase or decrease K rate by 10 kg/ha per tonne increase or decrease in grain yield.

3 For oat crops: increase or decrease K rate by 15 kg/ha per tonne increase or decrease in grain yield.

  

Potassium (K/ha) advice for cereal crops (Straw incorporated)

Soil K Index

Winter Wheat1,2

Spring Wheat1,2

 

Winter / Spring Barley1,2

Winter Oats1,3

Spring Oats1,3

1

70

70

65

75

65

2

65

55

50

60

50

3

50

40

35

45

35

4

0

0

0

0

0

1   Assumed crop yields:

Winter wheat = 11 t/ha     Spring wheat = 8.5 t/ha

Winter Barley = 8.5 t/ha   Spring Barley = 7.5 t/ha

Winter oats = 9.0 t/ha      Spring Oats = 7.5 t/ha

2 For wheat and barley crops: increase or decrease K rate by 10 kg/ha per tonne increase or decrease in grain yield.

3 For oat crops: increase or decrease K rate by 15 kg/ha per tonne increase or decrease in grain yield.

 

Potassium advice for non Cereal tillage crops

Crop

Potassium Index

1

(kg/ha)

2

(kg/ha)

3

(kg/ha)

4

(kg/ha)

Fodder Beet

320

240

160

80

Potatoes: Main crop

305

245

185

120

Potatoes: Early

170

140

110

80

Potatoes: Seed

170

140

110

80

Potatoes: Salad

245

185

120

65

Maize

250

225

190

1201

Field Peas

125

60

40

0

Field Beans

125

60

40

0

Oil Seed Rape

105

90

75

0

Linseed

75

60

40

0

Swedes/Turnips

250

200

170

125

Kale

220

210

170

0

Forage Rape

100

75

50

0

1 No Fertiliser k required when soil test K >250mg/L

(Table 17- SI No.  605 of 2017)

 Potassium advice as shown in the table above can be adjusted depending on crop yield potential.

For example a winter wheat crop with a yield potential of 10t/ha, straw removed and soil K index 1 will require 130 kg K/ha.

Timing of K applications

At soil K index 1 it is advisable that K be incorporated at or before sowing or soon after emergence.

At soil K indices 2-3, K can be incorporated prior to sowing or surface applied after sowing.

If compounds are used, restricted periods for P fertiliser application as set out in SI 605, 2017 must be respected.

P & K Off takes in Cereal Crops   Phosphorus and potassium application rates should be adjusted based on soil test results and crop yield potential.  Table 4 below shows the P & K off takes in cereal grain and straw at harvest time.  

P & K off takes in cereal crops (kg/ha) per tonne of grain yield

Crop Type

Straw Removed

Straw Not Removed

P

K

P

K

Winter Wheat / Barley

3.8

9.8

3.4

4.7

Spring Wheat / Barley

3.8

11.4

3.4

4.7

Oats

3.8

14.4

3.4

4.7