Kashaninejad and colleagues (2007) at their
research on four soybean cultivars founded that the seedmoisture content has significant effect on all the seed's
physical damages (Kashaninejad et al., 2007).
Francisco dubbern (2001) remarked the seeds whit
damaged seed coat usually have less vigor and viability
(Francisco dubbern and Marcos-Filho, 2001).
Jahufer and Borovoi (1992) reported that in
maize after processing there were different rates of
mechanical damage to seed coat in 89 percent of seeds.
This damage affects seed germination, seedling growth
and development and grain yield. Seedling emergence and
quality is affected by the place of damage in a way that
embryo and central parts of seed are more susceptible
(Jahufer and Borovoi, 1992).