Forage Harvester

A forage harvester is defined by its chopping function and continuous discharge, processing bulky green material into uniform, densely packable pieces rather than cutting and leaving it in a windrow. This makes it the standard harvesting tool for producing silage at scale.

1. A header cuts standing forage or picks up a pre-cut windrow
2. Crop material is fed into a rotating chopping cylinder or drum fitted with knives
3. The cylinder chops the material to a set length
4. An accelerator and discharge spout blow the chopped forage into a trailer travelling alongside or behind

Forage harvesting is the central step linking standing forage or silage-maize crops to livestock feed supply, and the resulting chop length and moisture content strongly influence how well the material packs, ferments, and stores in a silo, clamp, or bag. Because it works continuously without stopping to unload, the forage harvester is typically paired with a fleet of trailers to keep pace with its output.

Timely harvesting at the right crop moisture and maturity stage is important for silage quality, linking the operation closely to livestock feeding programmes on mixed crop–livestock farms.

Self-propelled forage harvester

A dedicated, high-capacity machine used on larger operations and by contractors.

Trailed (PTO-driven) forage harvester

Pulled and powered by a separate tractor, common on smaller or mixed farms.

Pickup header

Gathers pre-cut, wilted forage rows for grass or legume silage.

Row-crop header

Cuts and feeds standing maize or other tall row crops directly.

Chop length affects both silage packing density and fibre length available to livestock, and is adjusted according to crop type and target feed quality. High machine and labour costs mean that many smaller livestock operations use contractors for forage harvesting rather than owning the equipment.