Potato harvesters are machines that harvest potato

Potato

The potato is a starchy, tuberous crop from the perennial Solanum tuberosum of the Solanaceae family . The word potato may refer to the plant itself as well as the edible tuber. In the region of the Andes, there are some other closely related cultivated potato species...

es. They work by lifting the potatoes using a spade on to a web where the loose clay

Clay

Clay is a general term including many combinations of one or more clay minerals with traces of metal oxides and organic matter. Geologic clay deposits are mostly composed of phyllosilicate minerals containing variable amounts of water trapped in the mineral structure.- Formation :Clay minerals...

 falls out. The potatoes then move back on the harvester on to dolmen rollers and then on to a picking table where a men pick out the stones and the clay. The potatoes then go on to a side elevator and into a trailer

Trailer (vehicle)

A trailer is generally an unpowered vehicle pulled by a powered vehicle. Commonly, the term trailer refers to such vehicles used for transport of goods and materials....

 or a potato box.

Types

They come in single row and some can lift up to six rows at a time, some are self propelled and others are trailed behind tractor

Tractor

A tractor is a vehicle specifically designed to deliver a high tractive effort at slow speeds, for the purposes of hauling a trailer or machinery used in agriculture or construction...

s.