Agricultural distributor-trailer

A trailer, to be drawn behind a tractor, comprises a closed-ended generally U-section container 10 within which a shaft is rotatably mounted and arranged to be driven, via gearing, from the power take-off shaft of a tractor. At least two pairs of opposed paddle members 25 are rigidly attached to the shaft for rotation therewith and a discharge door 13 extends along at least one side of the container. When two pairs of paddles are provided, one pair carry mixing members 27, one located at the extremity of each paddle 25 and the other pair carry resilient flap dispensing members 28, one located at the extremity of each paddle 25.