The effect of genotype,location and season on cassava starch extraction |
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| Authors: | I R M Benesi M T Labuschagne L Herselman N M Mahungu J K Saka |
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| Institution: | (1) Chitedze Research Station, P.O. Box 158, Lilongwe, Malawi;(2) Department of Plant Sciences, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa;(3) Southern Africa Root Crops Research Network (SARRNET), P.O. Box 30258, Lilongwe, 3, Malawi;(4) Chemistry Department, Chancellor College, University of Malawi, P.O. Box 280, Zomba, Malawi |
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| Abstract: | When cassava is harvested too early, it often leads to reduction in yield, while delayed harvest leads to development of woody
and fibrous tuberous roots, and reduction in starch content. The optimum harvest time is not known. The objectives of this
study were to determine the effect of genotype, location and season on starch extraction in order to find an optimum harvest
regime for cassava, and to find the best parameter for monitoring starch levels in cassava tuberous roots. Results showed
that genotypic effect was large for starch weight, starch extraction rate on fresh weight basis, and root dry matter content.
This suggested that high starch weights could be realised by selection of suitable varieties for starch extraction. It was
found that cassava harvesting and starch extractions should be done between October and November since the highest starch
extraction rates were achieved during that period, and drying of the extracted starch using the open air method was fast and
convenient. The results also suggested that starch levels can efficiently be monitored using starch extraction rate on fresh
root weight basis. Starch content on fresh root basis and root dry matter content can also be used to determine the optimum
time to harvest cassava for starch extraction but were inferior to starch extraction on fresh root weight basis. |
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| Keywords: | Cassava Environment Harvest Starch |
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