The recommendations in this section are using the RoI fertiliser classification system and are based on Teagasc research. Due to slight differences between the RoI and NI classification systems, these recommendations are only a guide for Northern Ireland farmers. They can be converted between the RoI and NI classification systems using this CONVERSION TABLE
Before choosing your fertiliser products please consult your local advisor to ensure that you do not exceed the limits for your farm as determined by the nitrates directive (SI no 378) of 2006.
|
| Table
44. Nutrient Requirements (units/acre) |
| Index |
N |
P |
K |
| 1 Very Low |
120 |
56 |
200 |
| 2 Low |
88 |
40 |
180 |
| 3 Medium |
80 |
32 |
152 |
| 4 High |
60 |
0 |
0 |
|
|
-
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - |
|
Fertiliser
Recommendation
| Table
45. Application rate (bags/acre) |
| Index |
K1 Very Low |
K2 Low |
K3 Medium |
K4 High |
| P1 Very Low |
5½ x (0-10-20)
+
2 x (Muriate of Potash 50%) |
5½ x (0-10-20)
+
1½ x (Muriate of Potash 50%) |
5½ x (0-10-20)
+
4/5 x (Muriate of Potash 50%)K |
3½ x (16% Superphos) |
| P2 Low |
4 x
(0-10-20)
+
2½ x (Muriate of Potash 50%) |
4 x
(0-10-20)
+
2 x (Muriate of Potash 50%) |
4 x
(0-10-20)
+
1½ x (Muriate of Potash 50%) |
2½ x (16% Superphos) |
| P3 Medium |
4½ x
(0-7-30)
+
1¼ x (Muriate of Potash 50%) |
5 x
(18-6-12)
+
2½ x (Muriate of Potash 50%) |
8 x (16-4-20) |
2 ½ x (16% Superphos) |
| P4 High |
4 x (Muriate of Potash 50%) |
3½ x (Muriate of Potash 50%) |
3 x (Muriate of Potash 50%) |
0 |
|
|
| -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - |
| 3,000 gallons of cattle slurry is beneficial. It is not recommended to top dress with Nitrogen after the crop has emerged as it damages the growing point. |
| A farmer is in a low fertility area (P1,K1).
The fertiliser regime will be 5.5 bags of
0:10:20 plus 2 bags Muriate of Potash (50%K). |
| A farmer is in a medium fertility area (P2,K2).
The fertiliser regime will be 4 bags of
0:10:20 plus 2 bags Muriate of
Potash. |
| A farmer is in a good fertility area (P3,K3).
The fertiliser regime will be 8 bags of
16:4:20. |
|
|
|
