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: 238 mln kg N 489mln kg N

Effect mineral policy 240 220 mean CP grass silage (g per kg DM) 200 R² = 0,7598 180 160 140 120 100 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 Year

Money in the N-cycle 25 % efficiency 5 euro per kg N 4-5 euro per kg N 1 euro per kg N

80 % grassland/pastures Nitrate residue crop 112 120 100 81 80 53 60 43 38 40 20 0 Potato Maize Cereals Grass Beets

Growing high quality protein

Sulphur a must have, results 2016 & 2017 Sulphur application and N yield 1st cut 120 100 relative N yield 80 60 40 20 0 0 50 100 150 Sulphur application , kg SO3/ha

Sulphur a must have results 2016 & 2017 Sulphur application and protein quality 1st cut 60 50 buffer sol. CP % 40 30 20 R² = 0,6253 10 0 0 10 20 30 40 50 60 sulphur application, kg SO3 ha

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Fermentation changes everything

Silage fermentation =Pre- digestion DM and pH 6,5 6 5,5 pH Silage 5 4,5 4 3,5 3 200 300 400 500 600 700 DM(g/kg)

Fermentation, from silage to rumen o 495 NDF, 175 CP NDF digestion speed DM and NDF degradation rate 5,5 (kd NDF (%/u) 5 4,5 4 3,5 <30 30-40 40-50 > 50 DM-content (%)

Higher DM  less protein breakdown DM x DVE (AAT) 120 100 80 60 40 20 0 0 100 200 300 400 500 600 700 800 DM x OEB (PBV) 70 60 50 40 30 20 10 0 0 100 200 300 400 500 600 700 800 Silage GK farmers 2017: 190 g CP

High digestable: high DM silage

Low digestable: low DM silage

Whats the optimal DM of grasssilage? Mean ADL versus mean DM 500 Belgium Netherlands 450 DM g/kg 400 Germany Sweden Austria 350 300 20 22 24 26 28 30 32 ADL g/kg DM

Stability of grass silage over time. June December

Fermentation over time loss of sugar June-December 55 60 50 40 30 30 17 20 10 0 < 40 % DM 40-50% DM > 50% DM treated untreated

Fermentation over time change in pH June-december 0 < 40 % DM 40-50% DM > 50% DM -0,1 -0,2 -0,3 -0,4 -0,5 -0,6 -0,7 treated untreated

After 1st cut, different crop

You can make it, or you can break it.