They all share a set of similar concepts in the ways that they work, but there is established usage in which the machines for sowing some crops including maize (corn), beans, and peas are mostly called planters, whereas those that sow cereals are drills. The ones that handle larger seeds tend to be called planters, whereas the ones that handle smaller seeds tend to be called seed drills, grain drills, and seeders (including precision seeders). Various machines meter out seeds for sowing in rows. The most common row spacing in the United States today is 30 inches. The row units are spaced evenly along the planter at intervals that vary widely by crop and locale. Such larger and newer planters comprise multiple modules called row units. Planters vary greatly in size, from 1 row to 54, with the biggest in the world being the 48-row John Deere DB120. Planters lay the seeds down in precise manner along rows. It is connected to the tractor with a drawbar or a three-point hitch.
A planter is a farm implement, usually towed behind a tractor, that sows (plants) seeds in rows throughout a field.
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