Grains are small, hard, dry seeds, with or without attached hulls or fruit layers, harvested for human or animal consumption. "Grain crops" are grain seed producing plants. The two main types of commercial grain crops are cereals (wheat, rye) and legumes (beans, soybeans). Because of the ubiquity of grain as a food source, the term grain is often used to describe something small and with volume or mass similar to an individual grain seed.
After being harvested, dry grains are more durable than other staple foods, such as starchy fruits (plantains, breadfruit, etc.) and tubers (sweet potatoes, cassava, and more). This durability has made grains well suited to industrial agriculture, since they can be mechanically harvested, transported by rail or ship, stored for long periods in silos, and milled for flour or pressed for oil. Thus, major global commodity markets exist for canola, maize, rice, soybeans, wheat, and other grains but not for tubers, vegetables, or other crops.
Grains and cerealsEdit
In botany, grains and cereals are synonymous with caryopses, the fruits of the grass family. In agronomy and commerce, seeds or fruits from other plant families are called grains if they resemble caryopses. For example, amaranth is sold as "grain amaranth", and amaranth products may be described as "whole grains". The pre-Hispanic civilizations of the Andes had grain-based food systems but, at the higher elevations, none of the grains was a cereal. All three grains native to the Andes (kaniwa, kiwicha, and quinoa) are broad-leafed plants rather than grasses such as corn, rice, and wheat.
- finger millet
- foxtail millet
- Japanese millet
- Job's tears
- kodo millet
- maize (corn)
- pearl millet
- proso millet
Starchy grains from broadleaf (dicot) plant families:
- amaranth (Amaranth family)
- buckwheat (Smartweed family)
- chia (Mint family)
- quinoa (Amaranth family, formerly classified as Goosefoot family)
Pulses or grain legumes, members of the pea family, have a higher protein content than most other plant foods, at around 20%, while soybeans have as much as 35%. It is commonly believed that the proteins in pulses are "incomplete", that is they do not contain all the essential amino acids, however this is a misconception as all plant foods contain all eight amino acids essential to human health. As is the case with all other whole plant foods, pulses also contain carbohydrate and fat. Common pulses include:
- common beans
- common peas (garden peas)
- fava beans
- lima beans
- mung beans
- pigeon peas
- runner beans
Historical impact of grain agricultureEdit
Because grains are small, hard and dry, they can be stored, measured, and transported more readily than can other kinds of food crops such as fresh fruits, roots and tubers. The development of grain agriculture allowed excess food to be produced and stored easily which could have led to the creation of the first permanent settlements and the division of society into classes.
Occupational safety and healthEdit
Those who handle grain at grain facilities may encounter numerous occupational hazards and exposures. Risks include grain entrapment, where workers are submerged in the grain and unable to remove themselves; explosions caused by fine particles of grain dust, and falls.
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