Effects of Varieties and Harvesting Times on Yield, Paste Viscosity and Gelatinization Properties of Cassava Starch

Abstract

Plantation of 4 cassava varieties, Rayong 1, Rayong 60, Rayong 90 and Kasetsart 50 was done in sandyloam soil at Rayong Province, The yields and starches were determined from the root with different harvesting period ( 6, 8, 10, 12, 14 and 16 months). All four varieties had similar yields at the same harvesting period but the yields were increased by the increasing of cassava ages. The starch contents mainly depended on varieties and harvesting period. Rayong 90 and Kasetsart 50 contained higher amount of starch than in Rayong 1 and Rayong 60 and the root which was harvested in the dry season contained higher amount of starch than these in the rainy season. Although the viscosities of starch which extracted from vary varieties were not significantly different but the dry season harvested starch viscosity was higher than these obtained from the rainy season.