Appologies, but we have an 'email disaster' going on right now! Hopefully this can take a fairly long post...


An EM38 is a type of soil conductivity meter made by Geonics in Canada
Geonics website

We use our EM38 towed behind a pickup or 4-wheeel motorbike. The Em38 and GPS are both connected to a rugged PC (running Site Mate From Farm Works). This gives you a real-time colour map of the variation in soil type across the field. It also has a guidance system to help you drive every 30m in straight lines whatever the visibility conditions.

Measurements can be reliably taken at 20km/h and faster, since the reading is done by electromagnetic waves and there are no parts which penetrate the ground.

On 30m spacing at 20km/hr you cover 60ha/hr, so it is a very rapid data collection method.

EM38 measures ECa or ?apparent conductivity? which is the total conductivity of about a cubic metre of soil directly below the em38. Soil conductivity is mainly a factor of salinity, clay content and moisture content, and by using some strategic soil cores and modelling you can produce maps of the most relevant of these attributes.

You can read a bit about our services at : Farmworks EM Service

or you can read an article by my wife, Jo, here : EM Mapping System

There is also a very detailed document produced by the Grains Research and Development Corporation (GRDC) at GRDC Precision Ag Manual

We give a lot of advice on EM mapping and have helped people all over Australia set up their own system.

The unit we have for sale is a Dual Dipole EM38, which means it scans at 2 depths at once (approx 0.5m and 1m).

Cheers,

Martin.

I have a Dual-Dipole EM38 for sale.
Note quite what you are looking for, but much less expensive, covers the ground a lot faster, and works through trash and stoney soil.

Interested?

Cheers,

Martin.