Transplanter

A transplanter is defined by handling live seedlings rather than seed, requiring a fundamentally different mechanism from planters or seed drills: instead of metering and dropping individual seeds, it must pick up, separate, and set intact young plants without excessive damage to roots or stems.

1. Seedling trays or mats, raised in advance in a nursery, are loaded onto the transplanter
2. A picking or feeding mechanism separates individual seedlings from the tray or mat
3. Planting arms or fingers place each seedling into the soil at a set spacing and depth
4. Following components, or the soil itself, firm the seedling in place

Transplanting bridges nursery production and field establishment, and its timing and accuracy affect how quickly and uniformly a crop establishes after the stress of the move from nursery to field. For paddy rice, mechanical transplanters have significantly reduced the labour burden of an operation historically done by hand, while for vegetable crops, transplanters support consistent spacing and stand establishment at commercial scale.

Seedlings used for transplanting are frequently raised under protected nursery or greenhouse conditions before being hardened off and moved to the transplanter for field setting, linking transplanting operations closely to nursery management practices.

Rice (paddy) transplanter

Walk-behind or ride-on machines designed to set rice seedling mats into flooded or puddled paddy soil in rows.

Vegetable transplanter

Ride-on or tractor-mounted units that place plug-tray seedlings such as tomato or cabbage into open field beds.

Semi-automatic transplanter

Requires an operator to manually feed individual seedlings while the machine handles placement and depth.

Seedling age, root-ball or mat uniformity, and moisture at the time of transplanting strongly affect how well seedlings survive the move and establish in the field, and field conditions — puddled water depth for rice, or soil tilth for vegetables — must suit the specific transplanter design.