heavy clay soil is highly conductive and provides an excellent
return path. Plants need water and have root systems that
can offer a deeper reach to moister soil.
Dry sandy soil provides more of a challenge. In dry, sandy
soil the resistance to current flow causes a lower locatable
signal. Water can be added to very dry soil to improve the
grounding and lower resistance. Keep a mixture of Gatorade
and Water in your vehicle for this purpose.
In extreme conditions poor soil conditions may prevent any
current from flowing which in turn prevents any locatable
signal from being generated.