Hello everyone, here everyone sows the whole potato ?? Here in my zone a potato gives several plants, is made a cut or several according to the amount of "eyes" that the potato has, each piece only grows a plant and not several as when planting a whole potato, usually give potatoes well Bigger than the ones I saw in the photos. The cuts made are as in this example. 
Photo source: http://chc.org.br/fruta-verdura-ou-legume/
Good photo! we usually do but was swimming in potatoes this year (unproductive ones).. im going to try this next year! Thank you