Spelt

Spelt is believed to have originated in the Fertile Crescent region of the Near East, likely arising from a natural hybridization event between domesticated emmer wheat (Triticum dicoccum) and wild goatgrass (Aegilops tauschii).

• Archaeological evidence of spelt cultivation has been found at Neolithic and Bronze Age sites across modern-day Iran, Iraq, and southeastern Europe
• Spread westward into Central Europe by approximately 2500 BCE, becoming a dominant cereal crop in regions that are now Switzerland, Germany, Austria, and northern Spain
• Was widely cultivated throughout the Roman Empire; Roman soldiers reportedly relied on spelt as a campaign ration
• By the Middle Ages, spelt was the predominant wheat species grown in much of Central Europe and the British Isles
• The name "dinkel" is commonly used in Germany, where it remains an important traditional grain
• In Italy, spelt is known as "farro" and is classified into three categories: farro grande (spelt, T. spelta), farro medio (emmer, T. dicoccum), and farro piccolo (einkorn, T. monococcum)

Spelt is an annual, self-pollinating grass that closely resembles common wheat in overall growth habit but can be distinguished by several key morphological features.

General Habit:
• Annual cereal grass, typically growing 100–150 cm tall
• Hollow, erect culms (stems) with 5–7 nodes
• Forms dense tillers (side shoots) from the base

Leaves:
• Leaf blades are flat, linear-lanceolate, 15–30 cm long and 1–2 cm wide
• Leaf sheaths are smooth to slightly hairy
• Prominent auricles (ear-like clasping structures) at the blade-sheath junction
• Ligule is short and membranous

Inflorescence:
• Terminal spike (ear) is dense, laterally compressed, 8–15 cm long
• Spikelets are arranged in two rows along the rachis (central axis), with 2 florets per spikelet
• The rachis is tough and does not shatter easily at maturity (a trait distinguishing it from some wild relatives)

Grain (Caryopsis):
• Each grain is tightly enclosed within a tough, pale to straw-colored husk (lemma and palea) that does not thresh free during harvesting
• Grains are slightly smaller than common wheat kernels, typically 6–8 mm long
• Color ranges from light reddish-brown to golden amber
• The husk accounts for approximately 30–40% of the total grain weight, resulting in a lower milling yield compared to free-threshing wheats

Root System:
• Fibrous, relatively shallow root system typical of cereal grasses
• Effective at nutrient uptake in low-fertility soils

Spelt is adapted to a range of temperate climates and soil conditions, though it has specific ecological preferences that distinguish it from modern common wheat.

Climate:
• Grows best in cool, temperate regions with moderate rainfall (500–800 mm annually)
• Tolerant of cold winters; can be sown as either a winter or spring crop depending on the variety and region
• Winter spelt varieties require a period of vernalization (cold exposure) to initiate flowering
• Less heat-tolerant than common wheat; performs poorly in hot, arid conditions

Soil:
• Adaptable to a wide range of soil types, including marginal, nutrient-poor, and heavy clay soils
• Tolerates slightly acidic to neutral pH (5.5–7.5)
• Performs well on soils where common wheat yields would be reduced
• The tough husk provides natural protection against fungal diseases and insect pests, reducing the need for chemical inputs

Ecological Advantages:
• Well-suited to organic farming systems due to natural disease resistance and competitive ability against weeds
• Lower fertilizer requirements than modern high-yielding wheat cultivars
• Provides valuable habitat and food for farmland birds and insects when grown in traditional low-intensity systems
• Crop rotation with spelt can help break disease cycles associated with other cereals

Spelt is cultivated as a grain crop using methods broadly similar to those for common wheat, though its unique husk and agronomic characteristics require some specific considerations.

Sowing:
• Winter spelt: sown in autumn (September–October in the Northern Hemisphere), 3–5 cm deep, at a seeding rate of approximately 150–200 kg/ha
• Spring spelt: sown in early spring (March–April) where winters are too severe for autumn planting
• Row spacing of 12–15 cm is typical

Soil:
• Adaptable to poor, marginal soils where other cereals struggle
• Does not require high nitrogen inputs; excessive nitrogen can cause lodging (stem collapse)
• Well-drained loamy soils are ideal, but spelt tolerates heavier clay soils better than common wheat

Watering:
• Moderate water requirements; drought-tolerant once established
• Supplemental irrigation may be needed during prolonged dry spells in spring and early summer

Temperature:
• Optimal growing temperature: 15–22°C during the vegetative stage
• Winter-hardy varieties can survive temperatures as low as -20°C with snow cover
• Requires vernalization (4–8 weeks at 0–5°C) for winter types to flower

Harvesting:
• Harvested when grains reach physiological maturity (moisture content ~14–16%)
• Requires a conventional combine harvester; the tough husk remains intact after threshing
• Post-harvest dehulling is necessary to extract the edible grain

Propagation:
• By seed; spelt is predominantly self-pollinating, so saved seed will generally breed true
• Numerous heritage and modern cultivars are available, including 'Balmoral,' 'Champ,' 'Oberkulmer Rotkorn,' and 'Zollernspelz'

Common Problems:
• Lodging in high-fertility conditions
• Susceptible to Fusarium head blight and Septoria leaf blotch under humid conditions
• Ergot (Claviceps purpurea) infection in cool, wet flowering periods
• Lower yields compared to modern wheat (typically 3–5 tonnes/ha vs. 7–10+ tonnes/ha for common wheat)