The Terravent was originally developed as a joint project by the RHS, Kew and Pinnacle products as a way of recreating the beneficial ground effect of the 87 Hurricane without the downsides.

The terravent works by driving a 22mm probe into the soil and releasing a pressurised charge of nitrogen gas, up to 50bar or 725psi, into the soil, fracturing the soil compaction both vertically and horizontally, creating fissures for air, moisture and roots to freely move.

Terravent fracturing soil pan

This can be done at any depth up to 600mm, or deeper in special circumstances, below the ground with a 2-metre spacing, although in the heavily compacted ground we do go tighter.

Immediately after fracturing, the terravent offers the option to “inject” beneficial nutrients, fungi and bacteria via its liquid amendment chamber. This can boost the soil food web, adding much needed bio-available nutrients to the improved soil structure.

Post injection the probe holes are back-filled with a mix of activated biochar, worm casts and, when conditions allow, live worms can also be introduced to continue the process long after we’ve left.

If the area to be de-compacted is beneath existing hard standing it is possible to drill through the wearing course and sub-base with our Battery SDS drill to allow access for the probe.

The system is contained within its own purpose-built trailer, with the terravent head on a 15m hose meaning any vehicles, either the tow vehicle or our low ground pressure compact tractor for sensitive sites, and the trailer are kept outside of the area to be de-compacted. In addition, the terravent is the only machine that doesn’t rely on an external compressor or a powered carrier riding over the area to be de-compacted and carry’s enough gas and nutrients for more than a days work and is one of only two real alternatives to the airspade for tree rooting area aeration.

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