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Effect of dry-matter in making high-quality silage Max. 250 kg N per - - PowerPoint PPT Presentation
Effect of dry-matter in making high-quality silage Max. 250 kg N per - - PowerPoint PPT Presentation
Effect of dry-matter in making high-quality silage Max. 250 kg N per ha and 80 kg P2O5 of manure Our biggest challenge: 20 euro/ton Effect of mineral policy N input 2013 : N input 1996: 291 kg N /ha 440 kg N /ha Surplus 2013: Surplus 1996:
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- Max. 250 kg N per ha and 80 kg P2O5 of manure
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Our biggest challenge: 20 euro/ton
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Effect of mineral policy N input 1996: 440 kg N /ha N input 2013 : 291 kg N /ha Surplus 1996: 489mln kg N Surplus 2013: 238 mln kg N
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Effect mineral policy
R² = 0,7598
100 120 140 160 180 200 220 240 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 mean CP grass silage (g per kg DM) Year
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Money in the N-cycle 4-5 euro per kg N 1 euro per kg N 5 euro per kg N 25 % efficiency
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80 % grassland/pastures 112 81 53 43 38 20 40 60 80 100 120 Potato Maize Cereals Grass Beets
Nitrate residue crop
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Growing high quality protein
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Sulphur a must have, results 2016 & 2017 20 40 60 80 100 120 50 100 150 relative N yield Sulphur application , kg SO3/ha
Sulphur application and N yield 1st cut
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Sulphur a must have results 2016 & 2017
R² = 0,6253 10 20 30 40 50 60 10 20 30 40 50 60 buffer sol. CP % sulphur application, kg SO3 ha
Sulphur application and protein quality 1st cut
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Fermentation changes everything
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Silage fermentation =Pre- digestion
3 3,5 4 4,5 5 5,5 6 6,5 200 300 400 500 600 700 pH Silage DM(g/kg)
DM and pH
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- 495 NDF, 175 CP
Fermentation, from silage to rumen
3,5 4 4,5 5 5,5 <30 30-40 40-50 > 50 NDF digestion speed (kd NDF (%/u) DM-content (%)
DM and NDF degradation rate
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Higher DM less protein breakdown
20 40 60 80 100 120 100 200 300 400 500 600 700 800
DM x DVE (AAT)
10 20 30 40 50 60 70 100 200 300 400 500 600 700 800
DM x OEB (PBV)
Silage GK farmers 2017: 190 g CP
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High digestable: high DM silage
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Low digestable: low DM silage
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Whats the optimal DM of grasssilage?
Austria Germany Netherlands Belgium Sweden
300 350 400 450 500 20 22 24 26 28 30 32
DM g/kg ADL g/kg DM
Mean ADL versus mean DM
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Stability of grass silage over time. December June
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Fermentation over time 55 30 17 10 20 30 40 50 60 < 40 % DM 40-50% DM > 50% DM
loss of sugar June-December
treated untreated
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Fermentation over time
- 0,7
- 0,6
- 0,5
- 0,4
- 0,3
- 0,2
- 0,1
< 40 % DM 40-50% DM > 50% DM
change in pH June-december
treated untreated
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After 1st cut, different crop
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