To look up the implementation of a technologic package for the soya 's double production we did two experiments: silage and hay of the forrage of the varieties Soyica P-32 and Proacol's Forrajera. Silage was did in heavy plastic bags and added 3 doses of formic acid, 3 doses of formaldehyde and the final combinations of both additives (16 treatments that was applied 3 times). Hay was did in bales that weighted between 5-10 kg. AI though it demonstrated the possibility to use the hay and silage of soja's forrage for conservation, no differences was found between additives studied on the silage.