Barley

2007 Schools Wikipedia Selection. Related subjects: Food and agriculture; Plants

iBarley
Barley field
Scientific classification
Kingdom: Plantae Division: Magnoliophyta Class: Liliopsida Order: Poales Family: Poaceae Genus: Hordeum Species: H. vulgare
Binomial name
Hordeum vulgare L.

Barley (Hordeum vulgare) is a major food and animal feed crop, a member of the grass family Poaceae. In 2005, barley ranked fourth in quantity produced and in area of cultivation of cereal crops in the world (560,000 km²). Its germination time is anywhere from 1-3 days.

History

Cultivated barley (H. vulgare) is descended from wild barley (Hordeum spontaneum), which grows wild in the Middle East. Both forms are diploid (2n=14 chromosomes). As wild barley is interfertile with domesticated barley, the two forms are often treated as one species, divided into Hordeum vulgare subsp. spontaneum (wild) and subsp. vulgare (domesticated). The main difference between the two forms is the brittle rachis of the former, which enables seed dispersal in the wild. The earliest finds of wild barley come from Epi- Paleolithic sites in the Levant, beginning in the Natufian. The earliest domesticated barley occurs at Aceramic Neolithic sites such as the (PPN B) layers of Tell Abu Hureyra in Syria. Barley was one of the first crops domesticated in the Near East, at the same time as einkorn and emmer wheat.

Barley was, alongside emmer wheat, a staple cereal of ancient Egypt, where it was used to make bread and beer; together, these were a complete diet. The general name for barley is jt (hypothetically pronounced "eat"); šma (hypothetically pronounced "SHE-ma") refers to Upper Egyptian barley and is a symbol of Upper Egypt.

The ritual significance of barley in ancient Greece possibly dates back to the earliest stages of the Eleusinian Mysteries. The preparatory kykeon or mixed drink of the initiates, prepared from barley and herbs, was referred to in the Homeric hymn to Demeter, who was also called "Barley-mother".

Barley in Egyptian hieroglyphs

jt barley determinative/ ideogram
jt (common) spelling
šma determinative/ideogram

Greek practice was to dry the barley groats and roast them before preparing the porridge, according to Pliny the Elder's Natural History (xviii.72). This produces malt that soon ferments and becomes slightly alcoholic.

Tibetan barley has been the only major staple food in Tibet for centuries.

Palaeoethnobotanists have found that barley has been grown in the Korean Peninsula since the Early Mumun Pottery Period (c. 1500-850 B.C.) along with other crops such as millet, wheat, and legumes.

As of 1881

According to the 1881 Household Cyclopedia:

Next to wheat the most valuable grain is barley, especially on light and sharp soils. It is a tender grain and easily hurt in any of the stages of its growth, particularly at seed time; a heavy shower of rain will then almost ruin a crop on the best prepared land; and in all the after processes greater pains and attention are required to ensure success than in the case of other grains. The harvest process is difficult, and often attended with danger; even the threshing of it is not easily executed with machines, because the awn generally adheres to the grain, and renders separation from the straw a troublesome task. Barley, in fact, is raised at greater expense than wheat, and generally speaking is a more hazardous crop. Except upon rich and genial soils, where climate will allow wheat to be perfectly reared, it ought not to be cultivated.

Preparation of ground

Barley is chiefly taken after turnips, sometimes after peas and beans, but rarely by bad farmers either after wheat or oats, unless under special circumstances. When sown after turnips it is generally taken with one furrow, which is given as fast as the turnips are consumed, the ground thus receiving much benefit from the spring frosts. But often two, or more furrows are necessary for the fields last consumed, because when a spring drought sets in, the surface, from being poached by the removal or consumption of the crop, gets so hardened as to render a greater quantity of ploughing, harrowing and rolling necessary than would otherwise be called for. When sown after beans and peas, one winter and one spring ploughing are usually bestowed: but when after wheat or oats, three ploughings are necessary, so that the ground may be put in proper condition. These operations are very ticklish in a wet and backward season, and rarely in that case is the grower paid for the expense of his labor. Where land is in such a situation as to require three ploughings before it can be seeded with barley, it is better to summer-fallow it at once than to run the risks which seldom fail to accompany a quantity of spring labor. If the weather be dry, moisture is lost during the different processes, and an imperfect braird necessarily follows; if it be wet the benefit of ploughing is lost, and all the evils of a wet seed time are sustained by the future crop.

The quantity sown is different in different cases, according to the quality of the soil and other circumstances. Upon very rich lands eight pecks per acre [11 t/km²] are sometimes sown; twelve [16 t/km²] is very common, and upon poor land more is sometimes given.

By good judges a quantity of seed is sown sufficient to ensure a full crop, without depending on its sending out offsets; indeed, where that is done few offsets are produced, the crop grows and ripens equally, and the grain is uniformly good.

Composition

The Encyclopædia Britannica Eleventh Edition (1910–1911) cites the following composition of barley meal according to Ernst von Bibra, omitting the salts:

Production

Top Ten Barley Producers - 2005 (million metric ton)
Russia	16.7
Canada	12.1
Germany	11.7
France	10.4
Ukraine	9.3
Turkey	9.0
Australia	6.6
United Kingdom	5.5
United States	4.6
Spain	4.4
World Total	138
Source: UN Food & Agriculture Organization (FAO)

Barley was grown in about 100 countries worldwide in 2005. The world production in 1974 was 148,818,870 tonnes, showing little change in the amount of barley produced worldwide.

Cultivars

Barley

Barley can be divided by the number of kernel rows in the head. Three forms have been cultivated; two-row barley (traditionally known as Hordeum distichum), four-row (Hordeum tetrastichum) and six-row barley (Hordeum vulgare). In two-row barley only one spikelet is fertile, in the four-row and six-row forms, all three are fertile.

Two-row barley is the oldest form, wild barley having two rows as well. Two-row barley has a lower protein content than six-row barley and thus a lower enzyme content. High protein barley is best suited for animal feed or malt that will be used to make beers with a large adjunct content. Two-row barley is traditionally used in English beers, Six-row barley is traditional in German and American beers. Four-row is unsuitable for brewing.

Barley is widely adaptable and is currently a major crop of the temperate and tropical areas.

Uses

Oats, barley, and some products made from them.

Barley is a staple food for humans and other animals. It is more tolerant of soil salinity than wheat, which might explain the increase of barley cultivation on Mesopotamia from the 2nd millennium BC onwards. Barley can still thrive in conditions that are too cold even for rye.

Barley must have its fibrous outer hull removed before it can be eaten. Barley grains with their hulls still on are called covered barley. Once the grain has had the inedible hull removed, it is called hulled barley. At this stage, the grain still has its bran and germ, which are nutritious. Hulled barley is considered a whole grain, and is a popular health food. Pearl barley or pearled barley is hulled barley which has been processed further to remove the bran. It may be polished, a process known as "pearling".

Hulled or pearl barley may be processed into a variety of barley products, including flour, flakes similar to oatmeal, and grits. It may be malted and used in the production of alcoholic beverages. Malting barley is a key ingredient in beer and whiskey production. Two-row barley is traditionally used in German and English beers, and six-row barley in American beers.

Plant diseases

This plant is known or likely to be susceptible to barley mild mosaic bymovirus.