With bunker silo you can make sillage from grass or maize. Bunker silo made with concrete blocks is easy and fast to build and to transport.
Small Bunker Silo
Price: 8800$
Daily upkeep: 10$/day
Medium Bunker Silo
Price: 16000$
Daily upkeep: 15$/day
Big Bunker Silo
Price: 21600$
Daily upkeep: 25$/day