I vår försöksstudie har vi jämfört två såmaskiner av märket Väderstad Rapid. Jämförel-sen ligger i skillnaden i Dragkraftsbehov samt vibrationer i vertikal ledd. Maskinerna är utrustade med två olika system av återpackningshjul. På den ena maskinen, som vi valt att kalla ?Rakhjuling?, sitter hjulen parallellt bredvid varandra och på den andra maski-nen som har Offsetutrustning sitter vartannat hjul förskjutet ca ¼ av däckdiametern.

In Sweden, reduced tillage usually means non-inversion tillage, where primary tillage is carried out using chisel ploughs or disc implements. Primary tillage method is mainly determined by the desired soil loosening and the handling of soil residues. The effect of tillage depth was studied in field experiments in Skåne, Väderstad, Uppsala, Örebro och Västerås in different crops; spring oilseed rape, spring wheat, winter wheat and spring barley.The experiments generally had a randomized block design with the treatments mouldboard ploughing, deep chisel ploughing and shallow chisel ploughing, in some cases also shallow discing and no-tillage. In the experiments the following parameters were determined: seedbed properties, saturated hydraulic conductivity, penetration resistance, number of emerged plants and crop yield (all parameters were not determined in all experiments. Root growth and draught requirement were determined in two separate studies. There were no significant differences between tillage depths in non-inversion tillage in seedbed properties, plant emergence or root development.