EFFECT OF PHYSICAL CHARACTERISTICS ON THE TRANSPIRATION RATE OF CARROTS DURING STORAGE

P.C. Corrêa, L.R.L. Farinha, F.L. Finger, G.H.H. Oliveira, S.C. Campos , F.M. Botelho
Transpiration is the main cause of weight loss in agricultural products during storage, including carrots. It is an important physiological process that affects the main quality characteristics such as saleable weight, appearance and texture. The transpiration rate of horticultural products is proportional to superficial area, and influenced by the water vapor pressure and air velocity. Given that, the transpiration coefficient is a parameter that reflects the water loss of a specific surface. Thus, the objective of this work was to evaluate the influence of physical characteristics on the transpiration rate of ‘Brasília’ carrots during storage. Carrots with conic shape were classified by means of surface-volume ratio values, in three different classes: short, average and long (0.1214, 0.0847 and 0.0710 mm2 mm-3, respectively). The roots were stored for 120 h in climate controlled chambers at temperatures of 10, 20 and 30°C, and air relative humidity of 45, 65 and 95%, respectively. Transpiration coefficients were obtained at constant temperature, calculated by water mass flow, vapor pressure and relative humidity in relation to surface-volume ratio. This last variable was calculated from the dimensions of the roots with a digital micrometer. The work was carried out in a completely randomized design with three repetitions. Surface-volume ratio presented a significant influence on the transpiration coefficient. Short carrots obtained the highest transpiration coefficient, and relative humidity of 45 and 65% led to an increase in transpiration coefficients. All carrot classes stored at temperatures of 10, 20 and 30°C and 95% RH presented the lowest transpiration coefficients, with these conditions being acceptable for commercialization of these products.
Corrêa, P.C., Farinha, L.R.L., Finger, F.L., Oliveira, G.H.H., Campos , S.C. and Botelho, F.M. (2012). EFFECT OF PHYSICAL CHARACTERISTICS ON THE TRANSPIRATION RATE OF CARROTS DURING STORAGE. Acta Hortic. 934, 1341-1346
DOI: 10.17660/ActaHortic.2012.934.182
https://doi.org/10.17660/ActaHortic.2012.934.182
surface-volume ratio, Daucus carota L., transpiration rate
English

Acta Horticulturae