Physical characterisation and development of mass and volume models for tannia (Xanthosoma sagittifolium) cormels

Abstract

Physical properties of agricultural products are important for proper mechanization of their processing and handling operations. Models established based on these physical properties can also take a role in the automation systems and ensure efficient processing. This study determined some physical characteristics of tannia cormel and developed mathematical models for estimating its mass and volume using its geometrical attributes. Linear dimensions were within the range of 20.87-168.30 mm while the projected areas were within the range of 4.63-207.72 cm2. Average mass, volume and density were within the ranges of 7.40-256.80 g, 7.00-215.00 cm3 and 947.37-1565.45 kg m-3, respectively. Average sphericity, aspect ratio, shape index, eccentricity and elongation ratio were 0.73, 0.60, 1.84, 0.76 and 1.81, respectively. The results showed that tannia cormels are closer to being prolate spheroid in shape with relatively high sphericity. The mass and volume of tacca cormel can be reliably predicted using its projected areas and volume (for mass modelling only). The most suitable of all the models was obtained for mass model with respect to volume (R2 = 0.976). Data provided in this study are useful in the development of postharvest handling and processing systems for tannia cormels.