Millet

Millets are self- or cross-pollinating annual grasses grown for small grains that are milled, ground, or otherwise processed for food, and for their fodder value. Their agronomic profile — short duration, heat and drought tolerance, and modest soil requirements — makes them important staples in semi-arid cropping systems.

Production is dominated by smallholder systems in sub-Saharan Africa and South Asia, though some millet types are also grown in developed-country markets for forage, birdseed, and specialty food products.

Family

Poaceae (grass family)

Principal genera and species

Pennisetum glaucum (pearl millet), Eleusine coracana (finger millet), Panicum miliaceum (proso millet), Setaria italica (foxtail millet)

Growth habit

Tillering annual grasses, generally with a short life cycle relative to other cereals

The different millet species were domesticated independently in different regions: pearl millet in the Sahel of West Africa, finger millet in East Africa (and separately in South Asia), and proso and foxtail millet in China. Today they remain most important across the semi-arid tropics of Africa and Asia.

Because "millet" covers several distinct species, production and trade statistics are typically reported by individual species; current figures are best obtained from primary sources such as FAOSTAT.

Millets are among the most heat- and drought-tolerant cereals, capable of producing a grain crop where rainfall is too low or erratic for maize or sorghum. Pearl millet in particular is adapted to hot, semi-arid environments with short, unreliable rainy seasons.

Short duration to maturity allows millet to fit into cropping windows where the growing season is too brief or unpredictable for longer-season cereals.

Millets tolerate poor, sandy, and low-fertility soils better than most cereals, which is a major reason for their importance in marginal semi-arid cropping systems where other grains perform poorly.

Millet is typically sown at the start of the rainy season, often by hand or with simple seeding equipment in smallholder systems, though mechanized sowing is used in larger-scale production.

• Species and variety selection matched to season length and end use
• Crop rotation and intercropping, commonly with legumes, to manage soil fertility and pests
• Seedbed preparation appropriate to local rainfall and tillage practices
• Thinning and weeding during early establishment, when the crop is most vulnerable to competition

Nitrogen is the main limiting nutrient for millet yield in most low-fertility soils, though the crop is grown with minimal fertilizer input across much of its smallholder production area. Where inputs are used, phosphorus can also be important on inherently low-fertility soils.

Millet is grown predominantly rain-fed in semi-arid regions with low and variable rainfall, and its drought tolerance is a primary reason for its cultivation there. Irrigated millet is grown in some regions, mainly to stabilize yield in dry seasons.

Downy mildew is one of the most significant diseases of pearl millet, capable of causing substantial yield loss in susceptible varieties, and millet ergot can affect grain quality. Stem borers damage the stem and growing point, while white grubs attack roots in the soil.

Management relies heavily on resistant or tolerant varieties, along with monitoring and, where justified and available, locally authorized control products used according to their labels.

Millet is harvested once the grain has matured and dried sufficiently for threshing and safe storage. In smallholder systems, harvesting and threshing are often done manually or with simple equipment; larger operations use mechanized harvesting suited to the crop and region.

• Whole or milled grain for porridge, flatbreads, and other traditional foods
• Increasing use in gluten-free and specialty food products in some markets
• Livestock and poultry feed, and fodder from crop residues
• Birdseed and specialty grain markets in some countries