A destoner is a system that removes stones and clods from floor part and goes them to the furrow so that the part are completely exempt from stones. This also allows when increasing in wet conditions as the harvester can produce on a row of stones which allows improve hold.They remove stone using a series of internets (between two and five webs). The stones stay on the web and the clay-based falls through it. The stones trip through it and the bigger stones fall into a boulder box and little stones fall onto a mixture device and in turn fall into a trench. On the next finish the tractor tramps these stones down.