Abstract: A pneumatic conveying apparatus for silage and haylage, including long conveying ducts to carry the air stream with haylage and silage entrained therein. A positive displacement pump produces a flow of significant quantities of air to an air lock. The air lock has a rotor with blades traveling around the cylindrical peripheral wall and end wall defining traveling air lock compartments, the peripheral wall has an opening at its upper portion defining a feed throat receiving silage and haylage from a raised hopper. A high speed rotary impeller rotor at one side of the feed throat propels the silage-haylage into the air lock compartment. The rotor has sharp edged blades wiping along the edges of the air lock rotor blades and a boundary edge of the feed opening of the air lock.