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The best-known example of this kind is the tractor. From left to right: John Deere 7800 tractor with Houle slurry trailer, Case IH combine harvester, New Holland FX 25 forage harvester with corn head. Unimog with a flail hedge and verge trimmer implement used in agroforestry
They are used to push/pull implements—machines that till the ground, plant seeds, and perform other tasks. Tillage implements prepare the soil for planting by loosening the soil and killing weeds or competing plants. The best-known is the plow, the ancient implement that was upgraded in 1838 by John Deere.
Tine harrows are used to refine seed-bed conditions before planting, remove small weeds in growing crops, and loosen the inter-row soils to allow water to soak into the subsoil. The fourth is a chain disk harrow. Disks attached to chains are pulled at an angle over the ground. These harrows move rapidly across the surface.
Traditionally, an operator would plant at about 4.5-5.5 mph for optimal performance. However, with the advent of these systems electrical motors match the speed of the tractor and "dead-drop" the seed in the trench using either a belt or brush-belt which cause the forward momentum of the planter to be offset by the rearward momentum of the seed.
For example, the new 3032E tractor will be a 3000 with 32 hp (24 kW) rated engine; the E is low-specification. This tractor represents the 2007 model year 3203 for its specification, not to be mistaken for the 3320 which has the same power but more features and at a higher price. Over the next few years, all tractors will get this scheme.
Mahindra Tractors (India) Erkunt (Turkey)(part of Mahindra) ArmaTrac; Mahindra; Mitsubishi Agricultural Machinery (Japan)(own 33.3%) Trakstar (formerly Mahindra Gujarat and Shaktimaan brands) Mancel (France) Majevica (Serbia) Massey Ferguson (US)(part of AGCO Corporation) McCormick Tractors (Italy)(part of ARGO SpA) Millat (Pakistan)