POSSIBILITIES OF WEED CONTROL IN POPPY (Papaver somniferum L.) WITH HERBICIDES AVALIABLE ON THE SLOVENIAN MARKET

V enoletnem poljskem poskusu, izvedenem v letu 2008, smo proučevali možnost kemičnega zatiranja plevelov v posevku maka (Papaver somniferum L., cv. Jozef). Uporabili smo devet različnih herbicidov na podlagi prosulfokarba, klomazona, petoksamida, S-metolaklora, pendimetalina, izoksaflutola, bromoksiniloktanoata, mezotriona in fluazifop-p-butila. Analizirali smo stopnjo učinkovitosti herbicidov in njihovo fitotoksičnost ter pridelek semena maka. Učinkovitost herbicidov na podlagi S-metolaklora, izoksaflutola in fluazifop-p-butila je bila nizka. Ostali herbicidi so bili zelo učinkoviti in se med seboj po stopnji učinkovitosti niso značilno razlikovali. Od preučevanih herbicidov je največjo fitotoksičnost na maku povzročil pripravek na podlagi pendimetalina, nekoliko manj pa herbicid na podlagi izoksaflutola. Omenjenih dveh herbicidov ni priporočljivo uporabljati v posevkih maka. Proučevani herbicidi, ki so dostopni na slovenskem trgu, nudijo dokaj omejeno možnost za zatiranje plevelov v vrtnem maku.In a field trial conducted in year 2008 we studied possibilities of chemical weed control in poppy (Papaver somniferum L., cultivar Jozef). Eight herbicides based on prosulfocarb, clomazone, pethoxamid, S-metolachlor, pendimethalin, isoxaflutole, bromoxynil octanoate, mesotrione and fluazifop-p-butyl, were tested in terms of their efficiency to control weeds and in terms of their phytotoxicity to poppy plants at application period. At full maturity, we evaluated also the seed yield. As a result of the trial it was demonstrated that herbicides, based on S-metolachlor, isoxaflutole and fluazifop-p-butyl can not provide satisfactory level of weed control in pappy stands. Other tested herbicides provided much higher level of weed control and the level of their efficiency did not differ significantly among each other. Herbicides based on pendimethalin and isoxaflutole caused severe phytotoxicity to the poppy plants and can not be advised for use in poppy fields. The studied herbicides, which are available on the Slovenian market, can provide only a quite limited level of weed control for poppy crops