Abstract
Cassava (Manihot esculenta) is one of the main food crops that significantly contribute to food security and poverty alleviation in South and Southwest Ethiopia. Cyanide present in cassava roots poses a health challenge in the use of cassava for food. It is therefore important to identify the sweet and bitter types for food and industry. In this study, 11 farmers preferred genotypes were assessed for storage tuber yield, cyanide content and starch contents at Jimma, Metu and Tepi during 2015-2017 cropping seasons. From the genotypes analyzed, AAGT-108 (128.35 mg/kg) and AAGT-189 (118.5 mg/kg) are identified for bitter type (high HCN content). Based on storage tuber yield, genotype AAGT-108, AAGT-189 and AAGT 192 produced the highest tuber yield in all tested locations. The starch content varies from 5.11 (Qulle at Metu) to 18.40 (AAGT-108 at Tepi). Similarly, genotypes AAGT-108, AAGT-189 and AAGT-192 are the best materials at Jimma as compared to others and gave the mean starch content of 15.22, 16.98 and 16.61%, respectively. Based on the overall result of hydrogen cyanide and starch contents, genotype AAGT-108 and AAGT-189 are recommended for bitter type (high HCN content). On contrary, the rest of genotypes have sweet type due to low hydrogen cyanide content below 100 mg/kg and are recommended for human consumption.
Highlights
Cassava (Manihot esculenta Crantz,) is the sixth most important food crop globally, in terms of annual production [13]
At Jimma, genotypes AAGT-108, AAGT-189 and AAGT-192 are the best materials as compared to others and gave the mean starch content of 15.22, 16.98 and 16.61% per one kg of fresh storage tuber cassava sample
This result is supported by the report of [29], who reported the storage tuber length of cassava grown in clay soil and high moisture stress areas of southern Ethiopia are reduced significantly
Summary
Cassava (Manihot esculenta Crantz,) is the sixth most important food crop globally, in terms of annual production [13]. The crop have ability to survive adverse conditions such as infertile soil, drought, pests and diseases [9; 4] and plays several important roles in Africa serving as a rural staple food, famine-reserve crop, cash crop for households and as a raw material for feed and industrial manufacturing [22]. It has been identified as a potentially valuable source of food for addressing food security in developing countries [20] and a major source of food calories for about two of every five Africans [24].
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