Salvia hispanica
Salvia hispanica, one of several related species commonly known as chia, is a species of flowering plant in the mint family, Lamiaceae. It is native to central and southern Mexico and Guatemala. It is considered a pseudocereal, cultivated for its edible, hydrophilic chia seed, grown and commonly used as food in several countries of western South America, western Mexico, and the southwestern United States.
Description
Chia is an annual herb growing up to tall, with opposite leaves that are long and wide. Its flowers are purple or white and are produced in numerous clusters in a spike at the end of each stem.Typically, the seeds are small ovals with a diameter around. They are mottle-colored, with brown, gray, black, and white. The seeds are hydrophilic, absorbing up to 12 times their weight in liquid when soaked. While soaking, the seeds develop a mucilaginous coating that gives chia-based beverages a distinctive gelatinous texture.
Many plants cultivated as S.hispanica are in fact S. officinalis subsp. lavandulifolia.
Etymology
The word chia is derived from the Nahuatl word chian, meaning 'oily'.Other plants known as chia include Salvia columbariae, which is sometimes called "golden chia", Salvia polystachia, and Salvia tiliifolia.
Distribution and habitat
Chia is native to central and southern Mexico and Guatemala. It is hardy from USDA Zones 9–12.Cultivation
Chia is grown and consumed commercially in its native Mexico and Guatemala, as well as Bolivia, Ecuador, Colombia, Nicaragua, northwestern Argentina, parts of Australia, and the southwestern United States. New patented varieties of chia have been bred in Kentucky for cultivation in northern latitudes of the United States.It is grown commercially for its seed, a food rich in omega-3 fatty acids since the seeds yield 25–30% extractable oil, including α-linolenic acid. Typical composition of the fat of the oil is 55% ω-3, 18% ω-6, 6% ω-9, and 10% saturated fat.
Climate and growing cycle length
The length of the growing cycle for chia varies based on location and is influenced by elevation. For production sites located in different ecosystems in Bolivia, Ecuador and northwestern Argentina, growing cycles are between 100 and 150 days in duration. Accordingly, commercial production fields are located in the range of altitude across a variety of ecosystems ranging from tropical coastal desert, to tropical rain forest, and inter-Andean dry valley. In northwestern Argentina, a time span from planting to harvest of 120–180 days is reported for fields located at elevations of.S. hispanica is a short-day flowering plant, indicating its photoperiodic sensitivity and lack of photoperiodic variability in traditional cultivars, which has limited commercial use of chia seeds to tropical and subtropical latitudes until 2012. Now, traditional domesticated lines of Salvia species grow naturally or can be cultivated in temperate zones at higher latitudes in the United States. In Arizona and Kentucky, seed maturation of traditional chia cultivars is stopped by frost before or after flower set, preventing seed harvesting. Advances in plant breeding during 2012, however, led to development of new early-flowering chia genotypes proving to have higher yields in Kentucky.
Seed yield and composition
Seed yield varies depending on cultivars, mode of cultivation, and growing conditions by geographic region. For example, commercial fields in Argentina and Colombia vary in yield range from. A small-scale study with three cultivars grown in the inter-Andean valleys of Ecuador produced yields up to, indicating that the favorable growing environment and cultivar interacted to produce the high yields. Genotype has a larger effect on yield than on protein content, oil content, fatty acid composition, or phenolic compounds, whereas high temperature reduces oil content and degree of unsaturation, and raises protein content.Soil, seedbed requirements, and sowing
The cultivation of S. hispanica requires light to medium clay or sandy soils. The plant prefers well-drained, moderately fertile soils, but can cope with acid soils and moderate drought. Sown chia seeds need moisture for seedling establishment, while the maturing chia plant does not tolerate wet soils during growth.Traditional cultivation techniques of S. hispanica include soil preparation by disruption and loosening followed by seed broadcasting. In modern commercial production, a typical sowing rate of and row spacing of are usually applied.
Fertilization and irrigation
S. hispanica can be cultivated under low fertilizer input, using nitrogen or in some cases, no fertilizer is used.Irrigation frequency in chia production fields may vary from none to eight irrigations per growing season, depending on climatic conditions and rainfall.