The aim of the field experiments was to evaluate the effect of herbicide Proponit 720 EC used commercially (which content in I I - 720 g of propisochlor) for grass- and dicotyledonous weed control in winter wheat, winter barley, sugar beet, pea, potato and maize. The field trials were conducted over period 1995-1998 in experimental stations, which belong to the institute of Plant Protection. Proponit 720 EC effectively controls Apera spica-venti and Echinochloa crus-gal/i. In winter cereals dicotyledonous weed control was satisfactory but at other tested crops better weed control was obtained while Proponit 720 EC application with other herbicide. The yield of crops was increased after Proponit 720 application. Proponit 720 EC was not enough safe for sugar beet but was selective for other tested crops.

The aim of the experiments was to evaluate the effect of Sekator 6,25 WG used for broad leaved weeds control in winter and spring cereals. Sekator 6.25 WG herbicide is composed of iodosulfuron 1.25%, amidosulfuron 5% and mephenpyr diethyl 12.5%. The field trials were conducted over the period 1997-1999 at experimental station, which belonged to the Institute of Plant Protection. The results showed that Sekator 6,25 WG effectively controled Ga/ium aparine, Anthemis arvensis, Myosotis arvensis, Chenopodium album, Polygonum sp., Sinapis arvensis, Stel/aria media, Capsela bursa-pastoris, Thlaspi arvense and Lamium purpureum. The obtained yield of winter and spring cereals was increased by Sekator 6,25 WG application. Sekator 6,25 WG herbicide used in all experiments was safe for both winter and spring cereals.