Fulltext – Functional Properties of Bitter Yam (Dioscorea dumetorum) as Influenced by Soaking Prior to Oven-drying. The plant is often purposely grown at spare points on the land as an insurance against famine years, and is also encouraged in hedgerows around a farm and. Notes. BRIEF DESCRIPTION A climbing vine with robust, spiny stems reaching up to m in length. The leaves are trifoliate with ovate leaflets, cm long.
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Main use Used mainly as a vegetable, similarly to the potato, and some cultivars can be used to make French fries and chips, claimed to be superior to similar potato products. Seed may also be used. Nematodes in stored yams. Altitude-low or medium altitudes are best, though satisfactory growth at levels of up to m has been reported from northern India.
This may allow more solids to be leached out from dujetorum noodles into the cooking water [ 40 ]. Botanical name Dioscorea alata L.
Determination of bulk density: Weed control in the tropics, pp. There has been a small export trade in D.
Botany A strongly climbing vine, reaching 6 metres or more, with smooth stems ranging from I idoscorea 8 mm in diameter; twining is clockwise to the left. Therefore, processing by soaking in water is not recommended when the target is to increase the swelling index of the resultant bitter yam flour. The tubers do not store well, a high proportion becoming hard and inedible within 4 weeks after lifting. Few cultivars produce fertile seed and most are completely sterile.
Council for Scientific and Industrial Research, pp. Main use As a famine food-the tubers, growing near the surface, are easily accessible. Taxonomy, Morphology and Floral Biology.
Journal of Stored Products Research, 19, For each optimal cooking time and cooking loss value, five determinations were performed to obtain the mean values Equation 4. Diosgenin used as a basis for the corticosteroid family of drugs has been commercially prepared from some species notably D.
It is cultivated throughout the tropical world. A superb, if terse, resource, it is also available electronically on the Web – see http: Virus diseases have been reported from the Caribbean and West Africa, but are probably world-wide. Fungal diseases of the aerial parts are rare, but the tubers may dioscorrea affected by certain fungi, eg Botryodiplodia theobromae, Lasiodiplodia sp. Mechanical harvesting is being developed with cultivars specially bred for this purpose.
Preharvest microbial rotting of yams Dioscorea spp. Lye peeling of fresh yam Dioscorea alata. Origin and distribution D.
About 10g of noodles was cooked in ml of distilled water in a covered ml beaker. The sediment paste was weighed and swelling capacity was calculated as the weight of sediment paste per gram of noodle used Equation 3. Similar result was documented by Wirjatmadi et al. The tubers are large, weighing kg, roughly globose discorea deeply lobed, pale skinned, but covered with masses of fibrous roots: Currently, it seems that it should have a future in the home plot or gardens rather than commercial production.
Production and trade Production-despite the increasing consumption of introduced foods such as cassava and rice in the main yam-consuming area of the world West Africait appears that yam production is remaining constant at about 20 million tonnes per year. Minor cultivated Dioscorea species.
Main use Bitter yam is used as a vegetable, but not pounded into ‘fufu’. The starch consists mainly of fairly large granules microns and the gelatinisation temperature is from Higher yields are obtained if the setts are first germinated in warm seed beds to the stage when the adventitious bud appears as a small knob.
Bulk density and oil absorption capacity were determined by adopting the method of Udensi and Okaka [ 15 ]. Male flowers are small mm in diameterborne on spikes; female flowers are much less frequently borne and the production of seeds is somewhat rare.