Storing Malting Barley Without Losing Germination

Malting barley earns its premium because maltsters can germinate it. Every grain is a living seed, and storage is where it either stays alive and vigorous or slowly loses that ability. Lose germination and the load can drop to feed grade — and the premium goes with it.

What maltsters need

Malting barley specifications set strict requirements for germination, alongside moisture, protein, screenings and variety. Buyers typically need germination in the high 90s per cent, so there is very little room for loss. Check your buyer’s current specification for the exact figures.

What kills germination in storage

Seed viability declines over time in all storage, but two things speed it up enormously:

• Moisture. Higher moisture means faster deterioration. A long-standing seed-storage rule of thumb is that each percentage point of moisture lower roughly doubles storage life.
• Temperature. Warmer seed ages faster. The same rule of thumb says each 5°C lower roughly doubles storage life.

The two compound. Barley at 12% and 20°C will hold germination far longer than barley at 13% and 30°C.

Mould and insects also damage the germ directly, and heating from a hot spot can kill germination in that part of the silo quickly.

Storage targets

• Moisture: at or below 12% for long storage, below the 12.5% receival limit.
• Temperature: cool the grain soon after harvest and hold it below about 20°C — lower is better.
• Even conditions: no wet layers, no warm core.

Practical steps

1. Harvest at a safe moisture and avoid weather damage where you can — sprouted or weathered grain loses germination faster.
2. Cool it straight away. Grain off the header in the 30s °C is ageing fast. A forced aeration run removes field heat.
3. Keep it cool on good air. Avoid running fans on humid air that could raise moisture in the top layer.
4. Avoid over-drying with heat. If you dry with heated air, keep grain temperatures within the limits recommended for seed and malting grain.
5. Watch for moisture migration over winter, which can create a damp layer at the top.
6. Monitor regularly, and test germination before delivery if the grain has been stored a long time.

How SiloSense helps

SiloSense IQ shows temperature and moisture at every level of the silo every day, so you can confirm the whole silo is cool and dry — not just the sample point. Headspace CO₂ gives early warning of biological activity that could damage the germ.

Aeration Manager runs fans only when outside air is within your limits, so cooling doesn’t come at the cost of extra moisture.

Request a demo to protect your next malting barley crop.