To increase soil P Index

Use normal recommendations for Index 2 plus 700 kg Cropkare/ha until soil Index reaches 2. Check soil Indices by regular soil sampling every 3-5 years.

To meet annual crop requirements

Annual requirements for phosphate and potash depend on the crop grown and soil Indices. Recommendations for different Indices are given in Defra RB209 and are summarised in Tables A and B.

Many soils have different Indices for phosphate and potash. Where one Index is lower than the target for crop growth (2 for P, 2- for K), apply Cropkare to meet requirement at the lowest Index. Check Indices by soil sampling every 3-5 years (typically, cost of soil analysis is around 20p/ha/year).

The table below shows typical recommendations for Cropkare use in different crops. For more detail, or to refine use in a particular situation, refer to the RB209 recommendations summarised in Tables A and B.

Click the text below to view the table.

Typical recommendations for Cropkare

 

Cropkare
kg/ha

Supplying

kg P2O5/ha

kg K2O/ha

Winter wheat/barley

Straw incorporated

Index 0 or 1

800

80

96

Index 2

450

45

54

Straw removed

Index 0 or 1

875

87.5

105

Index 2

700

70

84

Spring barley

Straw incorporated

Index 0 or 1

750

75

90

Index 2

350

35

42

Straw removed

Index 0 or 1

850

85

102

Index 2

600

60

72

Winter oilseed rape

Index 0 or 1

750

75

90

Index 2

400

40

48

Peas/beans

Index 0 or 1

650

65

78

Index 2

300

30

36

Sugar beet

Index 0 or 1

875

87.5

105

Index 2

650

65

78

Forage rape, stubble turnips

Index 0 or 1

700

70

84

Index 2

650

65

78

Fodder beet, mangels

Index 0 or 1

1000

100

120

Index 2

900

90

108

Grass

Establishment

Index 0 or 1

800

80

96

Index 2

400

40

48

Grazing (whole year)

Index 0 or 1

400

40

48

Index 2

250

25

30

First cut silage (spring)

Index 0 or 1

600

60

72

Index 2

350

35

42

Table A. P2O5 recommendations for typical yields

 

Soil Index

 

0

1

2

3

4

 

kg P2O5/ha

Winter wheat/barley
(straw incorporated)

110

85

60

20

0

Spring wheat/barley, and oats
(straw incorporated)

95

70

45

0

0

Winter wheat/barley
(straw removed)

120

95

70

20

0

Spring wheat/barley, and oats (straw removed)

105

80

55

0

0

Winter oilseed rape

100

75

50

0

0

Spring oilseed rape, linseed

80

55

30

0

0

Peas and beans

85

60

35

0

0

Potatoes

270

230

180

130

50

Sugar beet

100

75

50

0

0

 

Forage maize

110

85

60

20

0

Forage swedes/turnips

100

80

60

40

0-40

Forage rape, stubble turnips

100

90

80

60

40

Fodder beet, mangels

130

120

110

90

60

Kale

130

120

110

90

60

Forage rye/triticale

80

60

40

20

0

 

Grass establishment

120

80

50

30

0

Grazed grass

60

40

20

0

0

First cut silage

90

65

40

20

0

Second cut silage

25

25

25

0

0

Table B. K2O recommendations for typical yields

 

Soil Index

0

1

2-

2+

3

4

kg K2O/ha

Winter wheat/barley (straw incorporated)

95

70

45

20

0

0

Spring wheat/barley, and oats(straw incorporated)

85

60

35

20

0

0

Winter wheat/barley (straw removed)

145

120

95

70

25

0

Spring wheat/barley(straw removed)

130

105

80

55

20

0

Oats (straw removed)

155

130

105

80

35

0

Winter oilseed rape

90

65

40

20

0

0

Spring oilseed rape, linseed

75

50

25

0

0

0

Peas and beans

90

65

40

20

0

0

Maincrop potatoes

350

325

300

275

150

0

Early/seed potatoes

220

195

170

145

50

0

Sugar beet

150

125

100

75

0

0

 

Forage maize

230

205

180

155

110

0

Forage swedes/turnips

200

175

150

125

80

0

Forage rape, stubble turnips

100

75

50

25

0

0

Fodder beet, mangels

160

135

110

85

40

0

Kale

250

225

200

175

130

0

Forage rye/triticale

170

145

120

95

50

0

 

Grass establishment

120

80

50

50

30

0

Grazed grass

60

30

0

0

0

0

First cut silage*

60/80

30/80

0/90

0/60

0

0

Second cut silage

120

100

90

60

40

0

Comparison of Cropkare recommendation and crop removal of phosphate and potash at typical yields

 

kg/ha

Cropkare

Applied

Removal

 

P2O5

K2O

P2O5

K2O

Winter wheat/barley
(straw incorporated)

450

45

54

60

45

Spring wheat/barley, and oats (straw incorporated)

350

35

42

45

35

Winter wheat/barley
(straw removed)

700

70

84

70

95

Spring wheat/barley, and oats (straw removed)

600

60

72

55

80

Winter oilseed rape

400

40

48

50

40

Spring oilseed rape, linseed

 

 

 

30

25

Peas and beans

300

30

36

35

40

Potatoes

 

 

 

180

300

Sugar beet

650

65

78

50

100

 

Forage maize

 

 

 

60

180

Forage swedes/turnips

 

 

 

60

150

Forage rape, stubble turnips

650

65

78

80

50

Fodder beet, mangels

900

90

108

110

110

Kale

 

 

 

110

200

Forage rye/triticale

 

 

 

40

120

 

Grass establishment

400

40

48

50

50

Grazed grass

250

25

30

20

0

First cut silage

350

35

42

40

0/90

Second cut silage

 

 

 

25

90