Perennial weed control by two layer ploughing

Experiments on methods of perennial weed control were carried out at the Kazliskiai organic farm of Lithuanian University of Agriculture in the period 2002-2003. The aim of the work was to investigate the influence of conventional 'cultural' cylindrical and two-layer plough technologies on perennial weed control in organic agriculture. The advantage of two-layer ploughing in decreasing perennial weed density and biomass in spring wheat and buckwheat crop was established. Elytrigia repens, Cirsium arvense, Tussilago farfara and Plantago major density and biomass had a tendency to decrease in different years of the trial.