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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 46. Nutrient Requirements (units/acre) |
| Index |
N |
P |
K |
| 1 Very Low |
136 |
100 |
244 |
| 2 Low |
116 |
80 |
196 |
| 3 Medium |
96 |
60 |
148 |
| 4 High |
68 |
40 |
96 |
|
|
| -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - |
|
Fertiliser
Recommendation
| Table
47. Application Rate (bags/acre) |
| Index |
K1 Very Low |
K2 Low |
K3 Medium |
K4 High |
| P1 Very Low |
16½ x (7-6-17)
|
13 x
(17-6-17)
+
1 x (16% Superphos) |
10 x (7-6-17)
+
2½ x (16% Superphos) |
6 x (7-6-17)
+
4 x (16% Superphos) |
| P2 Low |
13½ x (7-6-17) |
13 x (7-6-17) |
8 x (7-6-17)
+
1¾ x (16% Superphos) |
6 x (7-6-17)
+
3 x (16% Superphos) |
| P3 Medium |
10 x (7-6-17)
+
1¾ x (Sulphate of Potash 42%) |
10 x (7-6-17)
|
9 x (7-6-17) |
6 x (7-6-17)
+
1½ x (16% Superphos) |
| P4 High |
6½ x (7-6-17)
+
3 x (Sulphate of Potash 42%) |
6
½ x (7-6-17)
+
2 x (Sulphate of Potash 42%) |
6½ x (7-6-17)
+
1 x (Sulphate of Potash 42%) |
6½ x (7-6-17) |
|
|
| -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - |
| 7:6:17+8% Sulphur (S) |
containing Sulphate of Potash can give drier potatoes than 10:10:20
containing Potassium Chloride. High Nitrogen (N) rates will increase tuber size, reduce dry matter
content and delay maturity. |
|
|
| A farmer is in a low fertility area (P1,K1).
The fertiliser
regime will be 12 bags of 7:6:17 and 2.5 bags of 10:10:20. |
| A farmer is in a medium fertility area (P2,K2).
The fertiliser regime
will be 13 bags of 7:6:17. |
| A farmer is in a good fertility area (P3,K3).
The fertiliser
regime will be 10 bags of. 7:6:17. |
|
|
| For all situations, apply C.A.N. or Urea to satisfy the Nitrogen requirements as recommended by your advisor. |
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