An assembly for performing an agricultural operation, in particular crop processing. The assembly is provided with an autonomous agricultural machine that is movable over a parcel for performing the agricultural operation, the agricultural machine includes a machine container detachably disposed on the agricultural machine for containing an amount of the product required for performing the agricultural operation. A container for containing a stock of a product required for performing the agricultural operation is also provided and a control-unit automatically moves the agricultural machine to the container where a conveying device automatically exchanges the container with the machine container. Due to the fact that the machine container can be exchanged automatically and quickly with an exchange container, the assembly is relatively efficient in use.