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.
We are assuming that 3000 gals of slurry were applied per acre on first cut silage. |
| Table
22. Nutrient Requirements (units/acre) |
| Index |
N |
P |
K |
| 1 Very Low |
80 |
0 |
56 |
| 2 Low |
80 |
0 |
40 |
| 3 Medium |
80 |
0 |
28 |
| 4 High |
80 |
0 |
0 |
|
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| The recommendations given above for nitrogen and phosphorous are the maximum permitted according to the nitrates directive. |
| - There is not enough Potash (K) in 3,000 gallons of slurry applied on the first cut silage ground for the second cut silage requirement. |
| -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - |
|
Fertiliser
Recommendation
| Table
23. Application rate (bags/acre) |
| Index |
K1 Very Low |
K2 Low |
K3 Medium |
K4 High |
| P1 Very Low |
4 x (Classic NK) |
3 x (Classic NK) |
1 x (Classic NK) |
0 |
| P2 Low |
4 x (Classic NK) |
3 x (Classic NK) |
1 x (Classic NK) |
0 |
| P3 Medium |
4 x (Classic NK) |
3 x (Classic NK) |
1 x (Classic NK) |
0 |
| P4 High |
4 x (Classic NK) |
3 x (Classic NK) |
1 x (Classic NK) |
0 |
|
|
 |
Phosphorus fertiliser is not required. For all situations, apply C.A.N., Sweetgrass or Urea to satisfy the extra Nitrogen requirement as recommended by your advisor. |
|
Sweetgrass: 23% Nitrogen (N) + 2% Sulphur (S) + 1.2% Magnesium (Mg) + 5% Sodium (Na).
This product is especially formulated with the grass farmer in mind. The Sulphur and Magnesium will help to increase grass protein while the Sodium will encourage cows to have higher dry matter intakes, making it an excellent product for growing top quality silage.
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Where Sulphur (S) is required, choose a product from our product list with similar N, P, K contents to the products recommended above, and apply. The Teagasc recommended level for silage is 20 units/S/acre/per year. For more information on Sulphur go to Fertiliser index system page. |
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