A malting barley specification has one purpose: to make sure the grain will germinate evenly in the malt house and give good extract. Germination, protein, kernel size, moisture and variety decide that. A lot that misses any of them is sold as feed barley. This guide explains each parameter, the method the trade uses and how to write it into a contract.
Key takeaways
- Malting is controlled germination; a barley that cannot germinate evenly is feed.
- Germination energy and germinative capacity answer different questions; ask for both.
- Protein that is too high costs extract; too low starves yeast and enzymes.
- Screenings and plumpness set malt yield; the sieve sizes must be named.
- Hot drying, pre-germination and Fusarium are the usual reasons for rejection.
Why germination is the core parameter
Malting steeps barley, lets it germinate for several days and then kilns it. Every kernel has to wake up at the same time, or the malt is uneven. That is why a malting contract starts with germination and only then turns to protein and size.
Germination energy (germination energy) counts how many kernels germinate within a set time under standard conditions; the EBC method uses a 4 ml test, with an 8 ml test that shows water sensitivity. Germinative capacity measures whether the embryo is alive at all, by forcing germination or by a staining test. A barley with high capacity but low energy is dormant: alive, but not ready. Fresh-harvested barley is often dormant and needs weeks of storage before malting.
The specification
| Parameter | Why the maltster cares | How it is usually written |
|---|---|---|
| Germination energy | Even, fast modification | Minimum per cent, EBC method named |
| Germinative capacity | Viable embryo | Minimum per cent |
| Water sensitivity | Steeping regime | Reported, or maximum |
| Protein | Extract versus enzyme and yeast nutrition | Band on dry matter |
| Screenings and plumpness | Malt yield, uniform steeping | Share over and through named sieves |
| Moisture | Storage safety | Maximum, ISO 712 |
| Variety | Brewing performance | Named variety, purity minimum |
| Pre-germinated, skinned and broken kernels | Mould, uneven steeping | Maximum per cent |
As an indicative trade practice, maltsters often look for germination energy of 95 per cent or more, protein somewhere around 9.5 to 11.5 per cent on dry matter and a high share of kernels over a 2.5 mm sieve. These are conventions that vary by maltster and beer style; use the buyer’s own figures in the contract.
Protein: the narrow window
Protein and starch compete in the kernel. High protein lowers extract and can cause haze; low protein can leave too little free amino nitrogen for yeast. Nitrogen fertiliser and a dry finish push protein up, so the same variety can pass one year and fail the next.
Why lots are downgraded
Hot drying. Grain dried at high temperature can lose germination without looking different. Ask for drying records or air temperatures.
Rain at harvest. Pre-germinated kernels start malting in the field, and they spoil in storage.
Fusarium. Infected barley can cause gushing in beer and carries DON, which falls under Commission Regulation (EU) 2023/915. Many maltsters test DON on intake and set their own limits.
Mixed varieties. Different varieties germinate at different speeds. Variety purity is checked by DNA or protein tests.
Contracting
Malting barley is often bought on maltster contracts with a feed-barley fallback price, or on GAFTA forms with a malting quality clause. Either way, define who samples at loading, which laboratory decides, how long germination testing takes before acceptance, and the discount or rejection when a parameter fails. See malting barley for the product record and feed barley for where rejected lots go.
Sampling and the laboratory
Germination results depend on the sample. Ask for samples drawn across the whole lot, from several points in the silo or from the running stream at loading, and for a separate sample retained for dispute. Results taken on a single truck tell you little about a vessel.
Germination energy and germinative capacity are slow tests: the classic methods take several days, and dormancy can make a fresh lot look worse than it will be after storage. Agree in the contract when the test is run and which result prevails, the loading or the arrival test.
Protein, moisture and screenings are faster and are often measured by NIR at intake, with reference methods used for disputes. State which method is the reference.
Storage after purchase
Malting barley must stay alive until it is steeped. Dry it at gentle temperatures, cool it soon after intake, aerate the silo and monitor temperature and insects. A lot that heats in storage can lose germination even if it passed at loading.
Planning the season
Maltsters usually contract part of their needs before harvest, based on varieties and growing regions, and fill the rest after harvest when quality is known. A supplier who can show germination and protein results by region early in the harvest helps both sides decide which lots go to malting and which to feed.
See what germination energy means and hectolitre weight for the related tests.
Common mistakes
- Contracting protein without a lower limit, so very low-protein lots with poor enzyme potential pass.
- Testing germination too soon after harvest and rejecting a lot that is only dormant.
- Accepting a variety mix without asking for varietal purity evidence.
- Storing warm barley and losing germination before the malting date.
- Leaving out what happens to a lot that fails: price, outlet and timing.
Working with the feed outlet
Because rejected malting barley becomes feed barley, the two markets are linked. A contract that names the feed outlet and the price difference in advance reduces disputes after a failed germination test and lets both sides plan logistics before the result is known. It also gives growers a clear incentive to deliver their best lots to malting.
Checklist
- Variety and purity minimum named
- Germination energy and capacity minimums, EBC methods named
- Protein band on dry matter
- Sieve sizes and screenings limits stated
- Moisture maximum and drying temperature evidence
- DON position by instrument plus any buyer limit
- Sampling, laboratory, test timing and fallback price agreed