- Practical advice
- Mechanical extraction
- Uncover the anchoring roots
- Clear stump and roots
- Cut the roots with an ax
- Establish the anchor
- Extract the stump
- Apply a "stump destroyer"
- Drill the stump
- A progressive devitalization
- Chemical devitalization
When a tree is felled, the trunk can not be cut to the ground: the stump always emerges more or less, constituting a danger for the blade of the mower. There are two methods to eliminate it.
● You can replace the link chain with a cable with an eyelet at each end, type sling. The cables always have small broken strands that straighten up: it is imperative to handle them with handling gloves, because the bites are painful!
● When the tree trunk is large (Ø 30 cm), the extraction can be done in the same way, using an agricultural tractor coupled to the reinforced link chain.
If the aerial part of the tree is easy to cut, it is always difficult to get rid of the stump, because the roots, often many and deep, grip firmly on the ground. Depending on the size of the strain, it is possible to extract it mechanically (for small and medium) or to cause its decomposition by chemical agent (for larger ones).
The work is carried out on a small 15 cm diameter cherry tree whose tree was felled a year earlier; thus, the roots begin to die and offer less resistance to tearing.
● To begin, large roots are cleared by picking and removing soil around and under the stump. They are then cut with an ax about 30 cm from the trunk. Despite this work, the strain remains rooted, either by small roots, or by bigger ones impossible to reach.
● A chain encloses the stump of several turns and ends with two links joined by a shackle. Very used in marine, it is a lyre-shaped mesh closed by a wrench.
● Then you have to find a solid mooring point (a tree, a heavy vehicle, a concrete pole...). Here, a big walnut tree did the trick. To protect the base of the trunk, a bag wraps the turn of the tree, then a chain belt, closed by a shackle. Long enough, the chain attaches to that of the stump through the "pull-fort", small hoist, strength 1.3 tons, operated by a lever ratchet.
● The cable winding on a small drum, it is therefore by operating the lever that the chains are stretched by pulling on the strain which is extracted gradually. If roots resist, they will be cut with an ax as soon as they appear. The dug up strain can be burned or dumped. The hole is then closed by adding soil.
Uncover the anchoring roots
The goal is to extract this small strain whose trunk was cut a year earlier, which weakens the roots.
Draw around to reveal the main anchoring roots.
Clear stump and roots
Remove the roots and underside of the stump as much as possible with a dibbler or trowel to prepare for the passage of a chain that will be closed by a shackle.
Cut the roots with an ax
At about thirty centimeters from the trunk, cut the main roots by cutting them with an ax.
Chainsaw work may damage the blade in contact with the ground.
Establish the anchor
Here, the base of a large walnut will serve as an anchor.
Choose a sufficiently long and resistant chain.
Girdle the protected tree and close the loop with a shackle.
Extract the stump
Bring together the end of the anchor chain and the one that surrounds the stump.
Act on the lever of the ratchet winch: gradually, the stump emerges from the ground.
Apply a "stump destroyer"
Using the pod, fill the row of holes with "stump destroyer" powder. For more efficiency, the operation can be renewed a few months apart.
Work in dry weather.
Drill the stump
When the strain is of some importance, tearing becomes difficult but destruction is possible by chemical attack. Drill holes at the edge of the bark around the stump.
A progressive devitalization
This big stump could not be uprooted. Processed chemically, it is gradually devitalized: the wood dries out, crumbles. Later, the emerging part will be eliminated with the pick.
A freshly cut stump remains alive and it is the sap that carries the chemical up to the roots, consisting essentially of ammonium sulphate.
The practice is to drill holes close together (Ø 10-80 mm) on the whole periphery of the stump, just under the bark, and to fill them with powder using the pod representing 25 g of pure product. The dose is 200 g for a strain of 20 cm in diameter, 300 g for a 30 cm.
Some precautions should be observed:
- The treatment must be done on a stump cut at most 24 hours before (if not refresh the cut) and there must be no risk of rain within 24 hours.
- After six months, the strain begins to devitalize but it takes at least a year for the edges to disintegrate.
- The ideal period of treatment is between April and November.