Schenidt (2000) stated more fragile seed is more
susceptible to damage and the seeds with thin seed coats
or large cotyledons will damage easily. Even little
damages to seed during processing may rapidly affect seed
viability and cause seed vigor decrease and increase of
abnormal seedlings.
Verasilpa and his colleagues (2001) also at their
studies on two soybean cultivars, Chiang Ma60 and SJ.5,
found significant difference in mechanical damage and
broken seeds after processing and handling between two
cultivars. The cultivar with less mechanical damage
showed better results at germination test. Also there was a
significant difference between two cultivars in electrical
conductivity test and the cultivar with less mechanical
damage had much better vigor. They concluded the
cultivar which had more mechanical damage had larger
seed size and thinner seed coat in comparison with other
cultivar (Verasilpa et al., 2001).