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Sorghum

life science Maturity 9-11 Next article →

Sorghum bicolor is a versatile species of grass that plays a vital role in global agriculture. Commonly known as sorghum, broomcorn, or milo, it is the world's fifth-most important cereal crop. This plant is essential because it provides food for humans, forage for animals, and raw materials for industry. It is grown in tropical and subtropical regions across the globe. While most varieties are annuals that live for one season, some cultivars are perennial. Perennial plants can live for many years, which allows for repeated harvests without the need for constant resowing.

Domestication and races of Sorghum
Domestication and races of Sorghum

The plant is a large, stout grass that can grow quite tall in clumps. It produces bushy flowerheads called panicles. These panicles contain up to 3,000 seeds, which provide an edible, starchy grain. Sorghum is remarkably hardy and can thrive in many environments. It is drought-tolerant, heat-tolerant, and nitrogen-efficient. This means it can grow well even when water is scarce or soil nutrients are low. The plant can even tolerate high altitudes and toxic soils. It grows best in temperatures between 25°C and 30°C, with a growing season lasting 115 to 140 days.

Sorghum has a unique way of managing its environment through biology. It actively suppresses competing weeds by producing a chemical called sorgoleone. This is an alkylresorcinol that helps the sorghum win the struggle for space and nutrients. To maintain healthy soil, farmers often use crop rotation. They might leave a field fallow for two years or rotate sorghum with legumes. This practice improves the yield and makes the crop more resilient. The plant requires specific nutrients like nitrogen, phosphorus, and potassium to grow successfully.

Domestication and races of Sorghum
Domestication and races of Sorghum

The history of sorghum stretches back thousands of years to Africa. It was domesticated from wild ancestors more than 5,000 years ago in Eastern Sudan. Archaeologists found early evidence near the Atbara and Gash rivers. One significant find was near Kassala in eastern Sudan, dating from 3500 to 3000 BCE. This is linked to the Neolithic Butana Group culture. Evidence of its use even reached ancient Egypt, where sorghum bread was found in graves from 5,100 years ago.

Piece of sorghum bread contained in basket S - Museo Egizio, Turin S 285 p09
Piece of sorghum bread contained in basket S - Museo Egizio, Turin S 285 p09

As humans cultivated the plant, different races of sorghum evolved. The first domesticated race was bicolor, which had tight husks that required forceful removal. Over time, four other major races developed through cultivation. These included caudatum in the Sahel and durra, likely in India. The guinea race emerged in West Africa, and the magentiferum race later gave rise to varieties in Southern Africa. These newer races evolved larger grains and became "free-threshing." This means the grains are much easier to separate from the plant, making harvests more productive.

Domestication and races of Sorghum
Domestication and races of Sorghum

Global production numbers show how much the world relies on this crop. In 2023, world production reached 57 million tonnes. The United States is the leading producer, contributing 14% of the global total. Mexico, Ethiopia, and India are also major producers. China is the largest importer, buying more sorghum than all other countries combined. In 2013, China purchased American sorghum as a supplement to its domestic maize. This trade was worth about $1 billion per year until trade wars caused tariffs to be imposed.

Sorghum is highly nutritious and used in many different ways. The grain contains 72% carbohydrates, 11% protein, and 3% fat. It is also a good source of B vitamins and dietary minerals. Because it does not contain gluten, it is a vital option for gluten-free diets. People eat it as porridge, couscous, or flatbreads like Indian jōḷada roṭṭi. It can even be popped like corn, though the pieces are smaller than maize.

"Another view of the making of sorghum molasses on the Fred Hatmaker farm in the Norris Dam reservoir area." - NARA - 532657
"Another view of the making of sorghum molasses on the Fred Hatmaker farm in the Norris Dam reservoir area." - NARA - 532657

Beyond food, sorghum is used for fuel and industrial products. Sweet sorghum varieties have high sugar content and are used to make syrup. The stalks can be crushed to extract juice for molasses or biofuel ethanol. This ethanol production is efficient because the extracted carbohydrates ferment easily. In some regions, sorghum is also used to brew alcoholic beverages, such as Kaoliang liquor in China or malwa beer in South Africa. This wide range of uses makes sorghum a cornerstone of many agricultural systems.

"Another view of the making of sorghum molasses on the Fred Hatmaker farm in the Norris Dam reservoir area." - NARA - 532657
"Another view of the making of sorghum molasses on the Fred Hatmaker farm in the Norris Dam reservoir area." - NARA - 532657
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File:Piece of sorghum bread contained in basket S - Museo Egizio, Turin S 285 p09.jpg
Piece of sorghum bread contained in...
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"Another view of the making of sorghum...
2019 Sorghum map US.pdf
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