Cut into 1-in. cubes that each have an eye. Smaller pieces of potato encourages plant to grow roots quickly. Let the pieces air dry for 24 hours. You can dust with sulfur powder to prevent fungi from attacking them. Shake pieces in a bag with a small amount of the powder until evenly coated. They are fine without sulfur if the soil they are planted in is dry and warm.
Chitting potatoes is also called greensprouting, or pre-sprouting. Chitting it is a way of preparing potatoes for planting by encouraging them to sprout before planting in the ground. This gives the tubers a head start and encourages faster growth and heavier crops once the seed potatoes are planted.