There are two types of barley: two-row and six-row. Two-row barley is used in the majority (if not all) of European beers. In fact, this has led to the perception that two-row is superior than six-row when it comes to brewing. Compounding this perception is the fact that 6-row is used to feed animals in Europe. The Columbian Exchange brought goods and ideas indigenous in Europe to the Americas for the first time, among which goods was barley. In most parts of the Americas only six-row is suited to grow, leading to a stranglehold on the American beer market that has lasted for over 300 years. However, in the northern regions of America (i.e Canada), two-row can thrive.
The primary states that grow barley are largely in the mid- and north-west of the United States. Cargill (a malt company) does have contracts in Virginia and Pennsylvania, but these are few and far between. The production of barley has been tracked by the UN since the early 60s, and show an interesting trend for the US. Their in-depth analysis on the wide-wide industry can be found online here. This article has more about the international barley market than you could ever need. But let's focus on the United States.
|Figure 1 - United States Barley Produced / Imported|
Figure 1 was generated from the FAO statistics database and shows that American barley production (blue trace, axis on the left) has been on the decline since the beginning of the 90s. We are producing half the amount of barley as we were in 1995. Up until the 90s we were importing minimal barley, at less than 20,000 tonnes per year. However, imports (red trace with axis on right) rose dramatically in the beginning of the 90s.
NOTE: The two trances have different scales and the United States has produced more barley than we have imported since these statistics were being recorded. Including in 1994, where the imported trace is higher than the produced trace.
The statistics from the UN Food an Agriculture database show that the overwhelming majority of US barley import comes from Canada, which almost exclusively produces two-row. These trends have been driven by the craft beer explosion.
To understand why, we must first examine the difference between barley types.
Two-Row versus Six-Row
|Figure 2 - Types of barley|
A direct implication of the arrangement of barley kernels is on the size of each individual. Because there are more kernels packed into 6-row, they tend to be smaller. Being smaller gives them a higher surface area to volume ratio, making them better suited for american lagers (more on that later). However, two-row have a better yield in terms of weight of kernels per acreage of crop, though not by much.
|Figure 3 - Chemical differences in barley types|
The chemical differences between the malts come into play during the mash stage of brewing. Two-row has more starches (given in the table as extract) and less protein, while six-row has more proteins and less starches. The differences may seem minute, but they become substantial when you are using thousands of pounds of malt to create a single batch of beer.
Each of the parameters given in figure 3 will be addressed in a future post. The table shows that six-row has more proteins as a whole, but less a-amylase. This means that beta-amylase is more plentiful with respect to alpha-amylase, leading to a more efficient mash (see this post on the mash for differences between alpha and beta amylase). A trade off for this more efficient mash is less starch with which to work.
Why 6-row in American Lagers?
Besides the fact that 6-row is always been better suited for the climate and soil conditions in America, the physical and chemical differences of the individual kernel make it the more appropriate type of barley for American lagers. Due to the high adjunct levels in american lagers, the increased capacity for conversion (called diastatic power) is desirable, while the limited starch content is moot. A highly portion of the sugar in american lagers come from corn/rice. The high surface area to volume ratio means there will be more husks in the mash that will aid in preventing the adjunct cereals from clogging the grain bed during the sparge.
So back to the original point.
The craft brewing market in the US is killing its barley industry. Figure 1 shows the production of american barley drop off in the 90s, while our imports temporarily spike. While our imports have made their way down to what they were for most of the 60s-80s, barley production in the US is the lowest it has been since the UN has started recording these statistics.
The demand for american 6-row barley is collapsing. The standard american light lager that once had a stranglehold on the american beer market is losing popularity and people are instead drinking brews that derive their sugar from 2-row barley instead of corn/rice. This shift in demand put stress on the supply of barley, and the US was forced to increase its imports (mostly from Canada). Maltsters have been forced to divert thousands of acres from 6-row barley to keep up with the demand. It will only be a matter of time before maltsters develop a variety of 2-row that will grew well in the US.
While this economic pressure has stunted the US production of barley, it has led to the coming of age of the US beer culture. 30 years ago, it would be difficult to find an ale made in america at a super market. Instead, consumers had a choice of 15 different takes on a single style. Now any corner store will have a variety of styles from several different local breweries. While the craft beer has stunted the barley industry, it has rejuvenated the American beer culture.