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Fertiliser Requirements mid-season.
The capability of grass to grow is compromised if its requirements for major elements such as Phosphorus, Potassium and Sulphur are not met.
Phosphorus Requirements:
Do you qualify for the new P build up allowance?
To qualify for P build up you must be stocked at greater than 130kgN (c.1.6 cows/ha) , have a farm nutrient management plan completed through the NMP online and have completed a Teagasc training course.
Apply 50-75% of your P requirements in the spring with the remainder in the summer.
P fertiliser recommendations assuming the farmer qualifies for the additional P allowance
Soil Index | Maintenance (units/acre) | Build up (units/acre) | Total (units/acre) |
3 | 20 | 0 | 20 |
2 | 20 | 24 | 44 |
1 | 20 | 40 | 60 |
P fertiliser recommendations without the additional P allowance
Soil Index | Maintenance (units/acre) | Build up (units/acre) | Total (units/acre) |
3 | 20 | 0 | 20 |
2 | 20 | 8 | 28 |
1 | 20 | 16 | 36 |
If taking 1 cut of silage add 16 units P per acre, If taking 2 cuts add 28 units of P per acre to grazing requirements.
Potassium Requirements:
Apply maintenance rates during the growing season + build up rates in August/September
Soil Index | Maintenance (units/acre) | Build up (units/acre) | Total (units/acre) |
3 | 40 | 0 | 40 |
2 | 40 | 25 | 65 |
1 | 40 | 50 | 90 |
If taking 1 cut of silage add 100 units P per acre, If taking 2 cuts add 180 units of P per acre to grazing requirements.
Fertiliser Plan for index 3 P and K grazing ground
Timing | Nutrient(s) Required | Product | Rate | N | P | K | S |
Jan/Feb | N | Urea | ½ bag | 23 | |||
March | N/P/(K)/S | 18/6/10 + S | 2 bags | 36 | 12 | (20) | 8 |
April | N | 18/6/10 + S | 1.5 bags | 27 | 9 | (15) | 6 |
May | N+S | KaN + S | ¾ bags | 29 | 5.5 | ||
June | N | KaN | ½ bags | 23 | |||
July | N | KaN | ½ bags | 23 | |||
August | N/K | KaN, 27-0-11 | ¾ bags | 20 | 8 | ||
September | N | KaN | ½ bags | 23 | |||
Total | 204 | 21 | 43 | 19.5 |
Fertiliser Plan for 2nd cut silage:
Nutrients Required:
N | P | K | S | |
Index 1* | 80 | 24 | 110 | 16 |
Index 2* | 80 | 16 | 85 | 16 |
Index 3 | 80 | 8 | 60 | 16 |
Index 4 | 80 | 0 | 0 | 16 |
Index 1 and 2 assumes that build up was not applied earlier in the year
Fertiliser Plan (index 3 P and K/Silage ground where build up fertiliser was applied for 1st cut)
Product | Rate | |
No slurry | Silage Boost 21-2-10 + S | 4 bags |
3000 gals slurry | KaN 38% N + 7.5% S | 2 bags |
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