Tropical Root and Tuber Crops by V Lebot
By V Lebot
Lots of the world's poorest smallholders rely on tropical roots and tubers plants as their important resource of foodstuff and nutrients. those species produce huge amounts of nutritional power and feature good yields below tricky environmental stipulations. crucial plants are cassava, candy potato, yam and the aroids, sharing very important universal characteristics comparable to bulkiness, post-harvest perishability and vegetative propagation. This booklet compiles the hottest info at the beginning, genetics, body structure, agronomy, pests and ailments and submit harvest processing of those plants, whereas trying to supply rules for extra examine and improvement.
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Extra info for Tropical Root and Tuber Crops
The Euphorbiaceae are composed of not less than 300 genera and 8000 species. Almost all of them are tropical species and produce latex. Manihot glaziovii, for example, was once cultivated in Brazil and Nigeria for rubber production. The genus Manihot has been classiﬁed under the Manihotae tribe and comprises 98 tropical species, all from the New World, among which the only commercially cultivated one is M. esculenta Crantz (Rogers and Appan, 1973). Manihot species range in habit from herbs to shrubs, small trees and even climbing vines.
ESCULENTA CRANTZ Cassava ﬂowers are borne on terminal panicles, with the axis of the panicle being continuous with that of the branch. Each panicle bears male and female ﬂowers. The ﬁrst ones are numerous and located near the tip of the inﬂorescence. The female ones occur at the base of the axis, on the lower part of the inﬂorescence, and are fewer in number than the male ﬂowers. Each ﬂower, male or female, has ﬁve united sepals and there are no petals. The male ﬂowers have ten stamens grouped in two whorls of ﬁve each.
When the preliminary yield trial (PYT), advanced yield trial (AYT) and, especially, the regionl trial (RT) stages are reached, breeders are more interested in yield stability across different locations. Cooking quality (or ‘poundability’ for fufu at IITA) also begins in these trials. The selected clones are then released as new varieties. A new selection cycle can begin in which the new selected varieties are used as parents. Unfortunately, chemotypes with very attractive properties can be eliminated at an early stage because of the high selection pressure on other traits (Fig.