A groundnut digger is a tractor-drawn implement that lifts groundnut plants and pods out of the soil at harvest. A decorticator is a stationary machine that cracks the dried pods and separates the shells from the kernels.
Saurashtra in Gujarat is a large groundnut growing area, so local makers build both machines in some depth. They are designed for the bunch and spreading varieties grown there.
How a groundnut digger works
A digger has a wide, angled blade that runs under the pod zone and cuts the tap roots. The lifted plants pass over a rod chain, a vibrating grid or a set of tines, which shake off the soil.
Simple diggers only lift the crop and leave it in a windrow to dry. Digger-shakers add a powered conveyor to clean the plants better. Some models invert the plants so the pods face upwards and dry faster.
Most are mounted on the three-point linkage, and the shaker types are driven by the PTO. Width is usually one or two rows, matched to the row spacing farmers use.
How a decorticator works
Dry pods are fed into a hopper. A rotor or a set of beaters rubs the pods against a concave screen, which cracks the shells. A fan blows the light husk away, and the kernels fall out separately.
Small decorticators are hand-operated or run on a single-phase motor, for farm use. Larger models run on a three-phase motor and suit traders and processors. Bigger plants add grading and aspiration stages.
The key numbers are output per hour, shelling efficiency, and the share of broken kernels. Broken kernels sell for less and can lose seed value, so ask the maker for test figures on your variety. Pod moisture at the time of shelling has a big effect on breakage, so record it during any trial.
What to check before buying
- Check that the digger blade angle and depth suit your soil, because heavy or wet soil clogs simple diggers.
- Ask what the blade is made of and how it is hardened, as it wears quickly in sandy ground.
- Check the decorticator's screen sizes against your pod and kernel sizes, which differ by variety.
- Confirm motor voltage, frequency and starter type for your power supply.
- Look at belt and rotor guarding, which is often light on models built for the Indian market.
Fitting the machines to your crop
Varieties, row spacing and soil differ from Saurashtra, so ask whether the maker has adapted these machines before. Read whether agri machinery can be adapted for your soil and crops. For the wider range made locally, see what agricultural machinery is made in Gujarat.
Next step
We find groundnut machinery makers, check samples on your crop where possible, and supervise production and loading. To plan a range, book a free sourcing review.