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Application rates - recommendations
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.
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Typical recommendations for Cropkare
|
Cropkare
kg/ha |
Supplying |
kg P2O5/ha |
kg K2O/ha |
| Winter wheat/barley |
Straw incorporated |
Index 0 or 1 |
800 |
96 |
96 |
Index 2 |
450 |
54 |
54 |
Straw removed |
Index 0 or 1 |
875 |
105 |
105 |
Index 2 |
700 |
84 |
84 |
Spring barley |
Straw incorporated |
Index 0 or 1 |
750 |
90 |
90 |
Index 2 |
350 |
42 |
42 |
Straw removed |
Index 0 or 1 |
850 |
101 |
102 |
Index 2 |
600 |
72 |
72 |
Winter oilseed rape |
Index 0 or 1 |
750 |
90 |
90 |
Index 2 |
400 |
48 |
48 |
Peas/beans |
Index 0 or 1 |
650 |
78 |
78 |
Index 2 |
300 |
36 |
36 |
Sugar beet |
Index 0 or 1 |
875 |
105 |
105 |
Index 2 |
650 |
78 |
78 |
Forage rape, stubble turnips |
Index 0 or 1 |
700 |
84 |
84 |
Index 2 |
650 |
78 |
78 |
Fodder beet, mangels |
Index 0 or 1 |
1000 |
120 |
120 |
Index 2 |
900 |
108 |
108 |
Grass |
Establishment |
Index 0 or 1 |
800 |
96 |
96 |
Index 2 |
400 |
48 |
48 |
Grazing (whole year) |
Index 0 or 1 |
400 |
48 |
48 |
Index 2 |
250 |
30 |
30 |
First cut silage (spring) |
Index 0 or 1 |
600 |
72 |
72 |
Index 2 |
350 |
42 |
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 |
54 |
54 |
60 |
45 |
Spring wheat/barley, and oats (straw incorporated) |
350 |
42 |
42 |
45 |
35 |
Winter wheat/barley
(straw removed) |
700 |
84 |
84 |
70 |
95 |
Spring wheat/barley, and oats (straw removed) |
600 |
72 |
72 |
55 |
80 |
Winter oilseed rape |
400 |
48 |
48 |
50 |
40 |
Spring oilseed rape, linseed |
|
|
|
30 |
25 |
Peas and beans |
300 |
36 |
36 |
35 |
40 |
Potatoes |
|
|
|
180 |
300 |
Sugar beet |
650 |
78 |
78 |
50 |
100 |
|
Forage maize |
|
|
|
60 |
180 |
Forage swedes/turnips |
|
|
|
60 |
150 |
Forage rape, stubble turnips |
650 |
78 |
78 |
80 |
50 |
Fodder beet, mangels |
900 |
108 |
108 |
110 |
110 |
Kale |
|
|
|
110 |
200 |
Forage rye/triticale |
|
|
|
40 |
120 |
|
Grass establishment |
400 |
48 |
48 |
50 |
50 |
Grazed grass |
250 |
30 |
30 |
20 |
0 |
First cut silage |
350 |
42 |
42 |
40 |
0/90 |
Second cut silage |
|
|
|
25 |
90 |
