Determination of dry matter content in sweet potato storage root
1992
Ona, C.L. | Chujoy, E. (International Potato Center, P.O. Box 933, Manila (Philippines))
Results indicated no significant difference in dry matter (DM) of root samples obtained from either longitudinal or transversal cuts. Using the transversal cut, the root was divided into proximal, middle and distal portions. Although DM was lower in the middle portion and no significant difference in DM was observed between the proximal and distal portions of the transversal cut, the standard errors for the three portions were of comparable magnitude. For easiness to handle large number of roots, slices from the middle portion transversal cut could be utilized in sampling and DM results should be comparable to that obtained using slices from the middle of a longitudinal cut. Both the 50 and 100 g samples had comparable stand errors across varieties and could be alternatively utilized in sampling. The small 10 g sample size was not satisfactory because of the large standard error associated with it. A comparison of standard error indicate that longitudinal cut and 100 g sample followed by transversal cut and 100 g sample can be considered the best methods in determining the dry matter content of sweet potato roots. Significant differences in root DM content were observed among five sweet potato varieties. The highest DM was found in the yellow flesh variety miracle-Dingras (ranging from 34.7 to 35.4%); followed by the cream flesh, Bureau (29.6 to 29.8%); the white flesh, BPI-SP2 (22.2 to 22.6%); the pale yellow flesh, VSP-6 (20.4 to 20.6%) and; the least by the orange flesh VSP-1 (19.26 to 20.4%)
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