Plant Cumin

Spice:

Cumin

Botanical Name:

Cuminum cyminum

Botany:

Cumin is the dried seed of the herb Cuminum cyminum, a member of the parsley family. The cumin plant grows to 30–50 cm (12–20 in) tall and is harvested by hand. It is an annual herbaceous plant, with a slender, glabrous, branched stem that is 20–30 cm (8–12 in) tall and has a diameter of 3–5 cm (1+1⁄4–2 in).[10] Each branch has two to three sub-branches. All the branches attain the same height, so the plant has a uniform canopy. The stem is colored grey or dark green. The leaves are 5–10 cm (2–4 in) long, pinnate or bipinnate, with thread-like leaflets. The flowers are small, white or pink, and borne in umbels. Each umbel has five to seven umbellets. The fruit is a lateral fusiform or ovoid achene 4–5 mm (1⁄6–1⁄5 in) long, containing two mericarps with a single seed. Cumin seeds have eight ridges with oil canals. They resemble caraway seeds, being oblong in shape, longitudinally ridged, and yellow-brown in color, like other members of the family Apiaceae (Umbelliferae) such as caraway, parsley, and dill.

Cultivation:

Cumin is a drought-tolerant tropical or subtropical crop. It is vulnerable to frost and has a growth season of 120 frost-free days. The optimum growth temperature ranges are between 25 and 30 °C (77 and 86 °F). The Mediterranean climate is most suitable for its growth. Cultivation of cumin requires a long, hot summer of three to four months. At low temperatures, the leaf color changes from green to purple. High temperatures might reduce growth period and induce early ripening. In India, cumin is sown from October until the beginning of December, and harvesting starts in February. In Syria and Iran, cumin is sown from mid-November until mid-December (extensions up to mid-January are possible) and harvested in June/July. Cumin is grown from seeds. The seeds need 2 to 5 °C (36 to 41 °F) for emergence, an optimum of 20–30 °C (68–86 °F) is suggested. Cumin is vulnerable to frost damage, especially at flowering and early seed formation stages. Methods to reduce frost damage are spraying with sulfuric acid (0.1%), irrigating the crop prior to frost incidence, setting up windbreaks, or creating an early-morning smoke cover. The seedlings of cumin are rather small and their vigor is low. Soaking the seeds for 8 hours before sowing enhances germination. For an optimal plant population, a sowing density of 12–15 kilograms per hectare (11–13 lb/acre) is recommended. Fertile, sandy, loamy soils with good aeration, proper drainage, and high oxygen availability are preferred. The pH optimum of the soil ranges from 6.8 to 8.3. Cumin seedlings are sensitive to salinity and emergence from heavy soils is rather difficult. Therefore, a proper seedbed preparation (smooth bed) is crucial for the optimal establishment of cumin. Two sowing methods are used for cumin, broadcasting and line sowing. For broadcast sowing, the field is divided into beds and the seeds are uniformly broadcast in this bed. Afterwards, they are covered with soil using a rake. For line sowing, shallow furrows are prepared with hooks at a distance of 20 to 25 cm (8 to 10 in). The seeds are then placed in these furrows and covered with soil. Line sowing offers advantages for intercultural operations such as weeding, hoeing, or spraying. The recommended sowing depth is 1–2 cm and the recommended sowing density is around 120 plants per m2. The water requirements of cumin are lower than those of many other species. Despite this, cumin is often irrigated after sowing to be sure that enough moisture is available for seedling development. The amount and frequency of irrigation depends on the climate conditions. The relative humidity in the center of origin of cumin is rather low. High relative humidity (i.e. wet years) favors fungal diseases. Cumin is especially sensitive to Alternaria blight and Fusarium wilt. Early-sown crops exhibit stronger disease effects than late-sown crops. The most important disease is Fusarium wilt, resulting in yield losses up to 80%. Fusarium is seed- or soil-borne and it requires distinct soil temperatures for the development of epidemics. Inadequate fertilization might favor Fusarium epidemics. Cumin blight (Alternaria) appears in the form of dark brown spots on leaves and stems. When the weather is cloudy after flowering, the incidence of the disease is increased. Another, but less important, disease is powdery mildew. Incidence of powdery mildew in early development can cause drastic yield losses because no seeds are formed. Later in development, powdery mildew causes discolored, small seeds. Pathogens can lead to high reductions in crop yield. Cumin can be attacked by aphids (Myzus persicae) at the flowering stage. They suck the sap of the plant from tender parts and flowers. The plant becomes yellow, the seed formation is reduced (yield reduction), and the quality of the harvested product decreases. Heavily infested plant parts should be removed. Other important pests are the mites (Petrobia latens) which frequently attack the crop. Since the mites mostly feed on young leaves, the infestation is more severe on young inflorescences. The open canopy of cumin is another problem. Only a low proportion of the incoming light is absorbed. The leaf area index of cumin is low (about 1.5). This might be a problem because weeds can compete with cumin for essential resources such as water and light and thereby lower yield. The slow growth and the short stature of cumin favors weed competition additionally. Two hoeing and weeding sessions (30 and 60 days after sowing) are needed for the control of weeds. During the first weeding session (30 days after sowing), thinning should be done, as well, to remove excess plants. The use of preplant or pre-emergence herbicides is very effective in India, but this kind of herbicide application requires soil moisture for a successful weed control.

Wikipedia URL:

https://en.wikipedia.org/wiki/Cumin