Tillage without reversal will respect better soil life because the profile of the soil is not inverted,

The GUERILU digging fork (biofork, Grelinette TM , ... ) allows a deep work (up to 25 cm)   with less effort.

A digging fork also limits propagation of rhizome weeds (dog-grass) by avoiding dividing the roots.

When using this tool the profile of the soil is not inverted, the structure is maintained and water, air and biological organisms can penetrate the soil. This can't be achieved with a spade.
The tines are made from a special steel alloy making soil penetration easier.
Roots and stones do not hinder the penetration of the fork.
Working with the Biofork is less strenuous than working with a heavy spade.