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Working with a subsoiler is an agro-amelioration procedure consisting in loosening the soil without
turning it over, at a depth greater than the depth of plowing with a traditional plow. Subsoiling is intended to loosen
excessively compacted layers of the soil profile in order to rebuild its porous structure ensuring proper circulation
of water and air in the soil. The operation of agricultural machines for field tasks, including soil loosening and
plowing, involves wear and tear of the main working elements. The wear mechanism depends on the loads, the
working environment, including the type of soil and possible contamination, e.g. in the form of stones. The article
presents solid models and strength analyses using the finite element method. The aim was to compare the influence
of the tooth shape: an arched tooth shape and an intermediate tooth shape combining the features of an arched
tooth with a flat tooth. Simulations of the working environment concerned loads when loosening light and heavy
soil and when hitting a non-deformable element. The issue of the influence of the tooth shape on its strength was
solved during the simulation of the operation of the subsoiler. In an arched tooth and a tooth with the characteristics
of an arched and straight tooth, stresses of similar values are generated. Differences appear on surfaces with
geometric notch features. The greatest differences were noted when simulating a tooth hitting a stone, in which
case the arch tooth would be damaged.
