Roots and tubers

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Derris or Tuba Root
(Taylor & Francis, 1940) Worsley, R.R.; Production in East Africa; A.R.C.S., Amani
Active interest has been shown for some time past in the trials being carried out with Derris elliptica at the East African Agricultural Research Station, ,Amani, where a particularly toxic strain of this Malayan fish-poison and insecticide was introduced, via Kew, in 1928. It is now possible to give the yield and cost of production figures for the first normal crop of derris root harvested at Amani, the bulk of previous crops having been used for experimental purposes, or cut as planting material, for which there is a considerable demand in East Africa at present.
Strong Sweet Potatoes in Zanzibar
(1945) Tidbury G. E.
Unlike cassava, some varieties of which can be safely left in the ground for several months after the crop is ripe, sweet potatoes must be dug when the tubers are fully grown or rotting and insect infestation will rapidly destroy the crop. A further disadvantage of this crop in Zanzibar is that during the hot season, November to February, tuber formation does not take place even if the vines survive the hot, dry weather. There is thus a great shortage of sweet potatoes during the first half of each year. Some attention has, therefore, been given in this Protectorate to finding a simple method whereby the sweet potato can be stored for several months.