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Density and Storage

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Density and DM% Storage space Density and storage

Feed density and storage are crucial for dairy farming. The page provides details on the density and dry matter percentages of silage and hay, from direct cut grass to maize varieties. It's essential to note the varying storage requirements for different silages, such as maize or grass. Furthermore, the page offers insights into the density and storage recommendations for other feeds, including grains and specific vegetables. Ensure you consider these factors to optimise your storage solutions and make the most of your feed resources.

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

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 85 180-300 150-250 -
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
Last updated: Sep 2023
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