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Mid Season Fertiliser Requirements

Mid Season Fertiliser Requirements

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 IndexMaintenance (units/acre)Build up (units/acre)Total (units/acre)
320020
2202444
1204060

 

P fertiliser recommendations without the additional P allowance

Soil IndexMaintenance (units/acre)Build up (units/acre)Total (units/acre)
320020
220828
1201636

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 IndexMaintenance (units/acre)Build up (units/acre)Total (units/acre)
340040
2402565
1405090

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

 

TimingNutrient(s) RequiredProductRateNPKS
Jan/FebNUrea½ bag23
MarchN/P/(K)/S18/6/10 + S2 bags3612(20)8
AprilN18/6/10 + S1.5 bags279(15)6
MayN+SKaN + S¾ bags295.5
JuneNKaN½ bags23
JulyNKaN½ bags23
AugustN/KKaN, 27-0-11¾ bags208
SeptemberNKaN½ bags23
Total204214319.5
  • For index 2 P and K ground: use 1.5 bags of 18/6/10 + S in May instead of KaN + S
  • For index 1 P and K ground: use 1.5 bags of 18/6/10 + S in May instead of KaN + S + use 1.5 bags of 18/6/12 in June instead of KaN + use 0.5 bags of muriate of potash in September/October
  • If you have not spread P and K in the spring you will need to spread this across the main grazing season

Fertiliser Plan for 2nd cut silage:

Nutrients Required:

NPKS
Index 1*802411016
Index 2*80168516
Index 38086016
Index 4800016

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)

ProductRate
No slurrySilage Boost 21-2-10 + S4 bags
3000 gals slurryKaN 38% N + 7.5% S2 bags