Although the automated transplanters, like the one developed by Dole Fresh Vegetable Corp. described previously, are used by large companies, many operations use traditional "carousel" type transplanters that require workers to pull plants from the trays and drop a single plant into the revolving carousel of cups in the center of the screen. When positioned over the row, the bottom of each cup opens and the plant is guided into a groove in the soil. Press wheels at the back of the planter secure soil around the roots of each plant.