Perennial soybean (Neonotonia wightii) is a Fabaceae with potential to be used in

consortium with Poaceae plants to improve pasture quality. In order to add value to perennial

soybean seeds and improve their seed distribution, seeds coated with different materials in

coating machine were characterized by digital image analysis and physical attributes related

to physiological attributes in order to define the ideal amount and material to be used

in the coating. Different material quantities were tested, 150 g, 200 g and 250 g, divided

into layers, namely: sand, calcium silicate + sand and limestone + sand. Coating promoted

maximum increments of approximately 350% in seed mass and significant increases of up to

230% in area, 154% in maximum diameter, 162% in minimum diameter, 167% in contained

diameter and 152% in perimeter. The coating was also efficient in reducing the moisture of

the pellets by increasing the layers that cover the seeds. The sand + limestone combination

resulted in the largest pellets. The combination of sand + silicate did not interfere with plant

speed and formation. Thus, it was considered the appropriate material for the coating of

perennial soybean seeds.