The effect of different ways and frequency of harvesting of set aside arable land on the weed infestation

The influence of different ways and frequency of harvesting (1 or 3 cuts wi th mass removing, 1 or 2 times mulching per year) on weed infestation in th e stands of Bromus catharticus Vahl., Arrhenatherum elatius (L.) P.Beauv. e x J.S. et K.B. Presl, Festuca pratensis Huds., Dactylis aschersoniana Graeb n., Trifoliun repens L., Medicago lupulina L., Lotus corniculatus L., Medic ago media Pers. and fallow land was observed. The number of plants or stems of weeds and the dry mass yield were measured. Legume stands were most inf ested by weeds especially under the less frequency of harvesting (Medicago lupulina L, Trifolium repens L till 100 % of DM yield). Grasses were only v ery little infested. The three times cut stands were less infested compared to the others. Agropyron repens (L.) P.Beauv, Cirsium arvense (L.) Scop., Convolvulus arvensis L. and Lactuca serriola L. were the dominant weed spec ies.