Mark Plunkett Teagasc Johnstown Castle Wexford Mark Plunkett Teagasc Where should Cattle Slurry Go Recycle on Silage Fields Mark Plunkett Teagasc Whats the N P K of Manures ID: 1045515
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1. Delivery of P & K Slurry / FYM / Fertilisers Mark Plunkett, Teagasc, Johnstown Castle, WexfordMark Plunkett, Teagasc
2. Where should Cattle Slurry Go?Recycle on Silage Fields Mark Plunkett, Teagasc
3. What's the N – P – K of Manures? Available N, P & K values for a range of organic manures Units/1,000 gallonsManure typeNPKCattle slurry (7% DM)6532Cattle slurry (3.5% DM)5315Pig slurry (4% DM)19720 Units/tonneFYM3212SMC3316Poultry Manures Broiler/Deep Litter281236Layers (30% DM)14612Layers (55% DM)231124Turkeys282818Mark Plunkett, Teagasc
4. How to Maximise Recovery of N?Aim to limit Ammonia lossesLower slurry DM contentApplication timing → SpringLow emission spreading techniquesWeather conditions - Cool & Damp Mark Plunkett, Teagasc
5. Manure P & K as NutrientsP & K:Valuable source of P & K No losses to air (like N!)Available once applied to the soil P & K from organic manures can replace chemical fertiliserIndex 1 & 2 P assumed to be 50% available K assumed to be 90% availableMark Plunkett, Teagasc
6. Cattle Slurry – A Variable Fertiliser AverageRangeDM %6.90.411.9N (kg/t)2.40.25.2P (kg/t)0.50.11.1K (kg/t)3.50.57.7Green Book, 2016Ideally Test Slurry Mark Plunkett, Teagasc
7. Slurry Dry Matter ContentHot / dry weather - 3 units NTrailing shoe / Bandspreader + 3 units N1 % DM3.5 % DM7 % DM50 kgN P K4 - 1 - 950 kgN P K5 - 3 - 1550 kgN P K4 - 5 - 32Mark Plunkett, Teagasc
8. Fertilizer Value – Other manures50 kgN P K23 - 11 - 2450 kgN P K3 - 5 - 18Poultry Litter (Layer)50 kgN P K19 - 7 - 20Pig Slurry50 kgN P K3 - 2.5 - 12Solid Manures (1 ton)Slurry (1000 gallons)SMCFYMBeware of VariabilityMark Plunkett, Teagasc
9. Effect of Dry Matter % on N – P – K & Meeting 1st Cut Silage Requirements App. Rate 4% DM Slurry8% DM SlurryKg/haNPKNPK11t/ha54231074022t/ha1174720138033t/ha161170302012150% P Req. @ Index 3100% P Req. @ Index 3K Levels Tend to be lower in silage fields Mark Plunkett, Teagasc
10. Cutting Grazing Plots for Silage Taking out bales removes P & K ‘sEach tonne of Grass DM removes4kg P/ha25kg K/haFor example 2t Grass DM / ha removes:-8kg P/ha (6.5 units /ac)50kg K/ha (40 units/ac)1,250gals/ac Cattle slurry (7% DM) Or2 bags/ac 15-3-20Mark Plunkett, Teagasc
11. P & K in SlurrySilage: Slurry on silage ground closing nutrient cycleP:K supply ratio of slurry ≈ 1:6P:K requirement ratio for silage (Index 3) ≈ 1:6 Well balancedGrazing:P:K supply ratio of slurry ≈ 1:6P:K requirement ratio of grazing ≈ 1:3 Poorly balancedExcess K Luxury K uptake & Mg levels K might be required elsewherePig Slurry Ideal for Grazing Ground (1:3)Pig Slurry 19-7-20Mark Plunkett, Teagasc
12. Slurry Questions?1) Where to apply?Where on the farm needs both P and KTarget low P fields2) What application rate?How much P and K are required – avoid excess if needed elsewhere3) When and How should it be applied?Spring time Low emission Mark Plunkett, Teagasc
13. Methods of Applications Mark Plunkett, Teagasc
14. SplashplateLow maintenanceHigh Ammonia lossesN Loss during dryingGrassland contaminationMark Plunkett, Teagasc
15. Band SpreaderReduced Ammonia lossesLess maintenance than TSTend to be lighter than TSPrecise application of N/P/KLess grass contamination Mark Plunkett, Teagasc
16. Trailing ShoeReduced Ammonia lossesPrecise application of N/P/KWork in higher grass covers Better soil conditions Grass contamination is reducedMark Plunkett, Teagasc
17. In Summary Recycle slurry on silage fields Check slurry DM%Apply manures to Index 1 & 2 fields first Aim to maximise slurry application in springtime Low emission spreading with increase N efficiency & reduce GHG’sMark Plunkett, Teagasc, 2018 Mark Plunkett, Teagasc