A belt (11) of protection of silage comprises a first layer (21) and a second layer (23). The second layer (23) extends over at least a part of the first layer (21) and is assembled to the first layer (21) along at least a closed contour (25). Each closed contour (25) defines a compartment (27) between the first layer (21) and the second layer (23) and is arranged so as to contain a ballast material and to retain it in the said compartment (27).
