CONCLUSIONS
The present study showed that the farinograph properties
and anti-nutritional factors were significantly affected by
drying process and partial substitution of both cassava
varieties (Qulle and Kello) at different ratio in wheat flour.
The hydrogen cyanide (HCN) levels of the flours which were
prepared from two cassava varieties were found below the
maximum allowable limit (10ppm) by FAO and thus safe for
human consumption. This indicates that there is efficiency in
the method that is used for drying of cassava into flour
rendering it safe for consumption. The water absorption,
dough development time, mixing tolerance index and
farinograph quality number of composite flour dough’s were
influenced as the cassava flours level increased in wheat
flour. The substitution of cassava flour with wheat flour with
substitution level up to 20 % did not adversely affect the
quality properties of dough; comparable to that produced
from wheat flour in the farinograph properties. Studied
cultivars from Hawassa Agricultural Research Center
(HARC) had low cyanide levels which were all below the
WHO/FAO recommendations (