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.
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| Table 28. Nutrient Requirements (unit/acre) |
| Index |
N |
P |
K |
| 1 Very Low |
128 |
28 |
76 |
| 2 Low |
108 |
24 |
60 |
| 3 Medium |
80 |
16 |
48 |
| 4 High |
48 |
0 |
0 |
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| The nitrogen recommendations in the above Table are for light shallow soils. |
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If straw is ploughed in or burnt, decrease Phosphorus (P) rates by 5 units and Potassium (K) by 15 units. |
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These recommendations are based on the maximum nitrogen levels permitted.
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The maximum levels for P at index 1, 2, 3 and 4 are 36, 28, 20 and 0 respectively.
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Where proof of higher yields is available, an additional 20kg N/ha may be applied for each additional tonne above the following yields;
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Winter Barley - 8.5 tonnes/ha
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The higher yields shall be based on the best yield achieved in any of the three previous harvests, at 20% moisture content.
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Fertiliser Recommendation
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| Table 29. Application rate (bags/acre) |
| Index |
K1 Very Low |
K2 Low |
K3 Medium |
K4 High |
| P1 Very Low |
3 x (0-10-20)
+
2 x (Richland) as Top Dressing |
3 x (0-10-20)
+
2 x (Richland) as Top Dressing |
2 ½ x (0-10-20)
+
2 x (Richland) as Top Dressing |
1¾ x (16% Superphos)
+
2 x (Classic NP) as Top Dressing |
| P2 Low |
2 x (0-10-20)
+
3 x (Replenish) as Top Dressing |
2 x (0-10-20)
+
2 x (Replenish) as Top Dressing |
2 ¼ x (0-10-20)
+
1 x (Richland) as Top Dressing |
1¼ x (16%Superphos)
+
2 x (Classic NP) as Top Dressing |
| P3 Medium |
1½ x (0-7-30)
+
2 x (Replenish) as Top Dressing |
2 x (0-10-20)
+
1½ x (Classic NK) as Top Dressing |
1½ x (0-10-20)
+
2 x (Replenish) as Top Dressing |
¾ x (16% Superphos)
+
2 x (Classic NP) as Top Dressing |
| P4 High |
1½ x (Muriate of Potash) |
¾ x (Muriate of Potash)
+
2 x (Classic NK) as Top Dressing |
1 x (Muriate of Potash) |
No P or K Required |
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