Effekte unterschiedlicher Systeme der Grundbodenbearbeitungauf Erträge und Beikraut im Dauerfeldversuch Gladbacherhof

An organic long-term-field experiment with two factors has been carried out since 1998 at the experimental station Gladbacherhof, University of Giessen. Effects of different crop rotations combined with tillage treatments (mouldboard plough, twolayer- plough and tillage without plough) on plants, soil and weeds have been investigated. This article presents results on cash crop yields and weeds according to soil tillage. It can be concluded that, as for the yields, reduced tillage systems could cope with the regularly ploughed reference system if at least a shallow soil inversion was carried out. Concerning the lower yields in the soil tillage system without ploughing the impact of nutrient availability seems to be more important than the competition by weeds.