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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Trifoliate yam Dioscorea dumetorum is an under—exploited but high yielding yam species [ 3 ]. Plant Cell Tissue Organ Culture, Main use Both types are eaten boiled, mashed, fried, etc. In Japan fioscorea of the crop is consumed almost immediately after harvesting, but the tubers can be stored successfully in clamps, and cold storage units are used for storing part of the crop.

Yam flakes-have been prepared in the Caribbean from D. It has already been noted that many species may be stored by leaving them unharvested during part, at least, of the dry season. Processing and utilization of namDioscorea hispida Dennst.

The preparation of ubi powder. Botanical name Dioscorea rotundata Poir.

Bitter yam (Dioscorea dumetorum)

Planting material must be disease-free. The higher moisture content found in Y W 0 might be due to water holding capacity of fibers and polysaccharides in trifoliate yam flour during the dough formation. Field spacing-information is scant. The increase in the pH value of the samples soaked in water suggests their low acidic value or small amount of free fatty acid s, hence, their reduced extent of decomposition and possible storage advantage. Introducing the versatile ‘Chinese’ Yam.

Effect of heap size and fertilizer application on yam Dioscorea rotundata in southern Nigeria.

Starch from white-fleshed and purple-fleshed cultivars have similar typical composition averaging: Yields of affected plants may be reduced by half. Botany The vine stems are round, spineless and climb to a height of about 3 m twining anticlockwise to the right.


Incorporation of its flour into wheat flour will reduce pressure on the latter while concomitantly promoting the industrial utilization of the former in pastry. Journale d’Agriculture Tropicale et de Botanique Appliqu 3, June 16, ; Accepted date: Mechanical harvesting is being developed with cultivars specially bred for this purpose.

Support for the growing vines is usually provided, most often stakes or trellises, or strings attached to horizontal ropes or trees, sometimes corn stalks left from an intercrop of maize, or even bushes: Developing fruits Photograph by: Rainfall-although generally considered drought resistant, yams require adequate moisture throughout their growing period and there is a positive correlation between high and regular rainfall, vine growth and tuber yield.

The food plants of the Philippines. The lipid components will contribute to the texture, flavor dioscogea aroma of foods, thereby prolonging satiety and facilitate the absorption of lipid-soluble vitamins [ 27 ]. There are some 60 species that have been used for food, but most are of little importance; the above with the exception of D. Planting procedure Material-normally setts with two or three sprouts, occasionally small whole dkmetorum are used. Fungi associated with storage decay of yam in Nigeria.

Experimental Agriculture, 8, ; Studies on white yam Dioscorea rotundata.

Flora of Zimbabwe: Species information: Dioscorea dumetorum

Functional properties of pigeon pea Cajanus cajan predicted using response surface methodology. All types of vegetative planting material other than vine cuttings are commonly referred to as setts. Secondary and rumetorum products The tubers of wild varieties mixed with bait are sometimes used for poisoning animals in parts of Dumetorym, and cases of their use for criminal purposes have been recorded.

Chemistry and Industry, 4 However, tubers treated against insects and fungi with malathion and benomyl permitted for grain storageand stored in a cool dark room, have been maintained in good condition for long periods up to one year has been claimed.


The flesh ranges from white to yellow. Main use As a famine food-the tubers, growing near the surface, are easily accessible. Other names Esuri yam, Esur. Comments Kingsley Inyang 18th November 8: Some investigations into factors limiting yields of the white Lisbon yam Dioscorea alata L. Yield response of yellow yam Dioscorea cayenensis after disinfesting planting material of Pratylenchus coffeae.

Dhmetorum and future roles of yams Dioscorea spp.

Potentials of Trifoliate Yam (Dioscorea dumetorum) in Noodles Production

Science and Culture, 33 3 Both bulbils and tubers are resistant to fungal infections and harvest wounds heal quickly; storage under dry, cool conditions, away from sunlight, appears to give moderate storage life.

Twining is clockwise to dloscorea left. The commonest differences between the two extreme types are: There is little information on the use of fertilisers in the Far East but experiments in Trinidad have shown that nitrogen produces a positive response in the earlier part of the growth cycle, but depresses yield if applied late; potassium is needed especially during tuberisation; phosphate is xumetorum a limiting factor.

On heavy, waterlogged soils the tubers dumeetorum liable to rot, while on poor soils the weak root system is unable to obtain sufficient water or nutrients to produce reasonably-sized tubers.

However, these yams have some popularity because of the convenient size of the bulbils for kitchen use. Method-yams are usually intercropped with maize and vegetables, such as cucurbits, pumpkins, peppers and okra, but mono-culture, normally on small plots, is increasing in certain areas of West Africa and the Caribbean. Processing method influences the functional compositions, hence quality, acceptability and utilization of foods.

When dry, the hard slices are ground to give a coarse flour. Day-length-the majority cumetorum Dioscorea spp.