This page contains information about the density and storage of feeds. Download or order the Facts and Figures guide to find out more.

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Density and DM% of silage and hay

Silage types DM% Wet weight silage kg/m³ in stack or hay in bale DM silage kg/m³ in stack/bale Density in wagon kg/m³ in stack
Direct cut grass 13-18 700-900 120-160
Wilted grass 20-30 600-800 160-180
Baleage 35-40 500 130-180
Hay – small bales 85 18-25 15-20
Hay – round bales 85 180-300 15-20
Maize stack 33-38 500-760 170-250
(average 200)
80-120
Maize bunker 33-38 600-820 200-270
(average 220)
80-120
Maize deep bunker
not common 5% of bunkers)
33-38 760-900 250-300 80-120

Storage space required for grass and maize silage

Silage storage Tonnes DM multiplied by: Example
Maize stack 5.0 e.g. 50 t DM x 5.0 = 250m³
Maize bunker 4.4 e.g. 50 t DM x 4.4 = 222m³
Grass silage 5.7 e.g. 50 t DM x 5.7 = 285m³

Density and storage of other feeds

  Density (kg/m³)
Storage (m³/tonne)
Grains – barley
630 1.6
Grains – wheat
760 1.3
PKE
630-750 1.35-1.6
Carrots 630 1.6
Onions (dry) 630-725 1.4-1.6
Potatoes 660 1.5