The results of the sensory evaluation of whiteness and browning
are shown in Table 1. In this study the sensory attribute browning
was used to express the discolouration of the tubers. The
browning of raw tubers estimated the degree of enzymatic browning,
and the browning of boiled tubers estimated the degree of
after-cooking darkening. The whiteness of raw tubers was a measurement
of the flesh colour of the raw tubers and the whiteness
of boiled tubers was a measurement of the inner colour of cubes
after boiling. There were no significant differences (p > 0.05) between
varieties in browning or whiteness of raw tubers at either
harvest time (Table 1). However, at both harvest times, the variety
Mari scored lower in browning after boiling than the other two
varieties (Table 1). In the autumn, the variety Mari had significantly
(p 6 0.05) higher scores in whiteness than Rema and Draga.
Sensory scores for whiteness and browning were negatively related
in both raw and boiled tubers.