Reakcije Avena fatua L. na piroksulam

Responses of weed species Avena fatua L. to pyroxulam were studied in pots on the open field. Pyroxulam were applied when plants were 15-20 cm high. Herbicide applied at five different rates (150g ha-1; 112.5 g ha-1, 75 g ha-1, 37.5 g ha-1 i 18.75 g ha-1) without and with adition of adjuvant Dassoil in rate of 500 ml ha-1, while control were not treated. For estimation plant responses to growing rates of pyroxulam the next parameters were neasured and analyzed: vizual estimation of plant damage (7 and 14 days after herbicide application), fresh and dry weight (14 days after herbicide application). Responses of A. fatua to pyroxulam were different depend on application rate of herbicide, adition of adjuvant and studied parameter. Adition of ajuvant increased reduction of measured parameters, although its impact on pyroxulam effect were more prominent based on ED50 values. Namely, ED50 value for fresh weight was more higher when pyroxulam applied without adjuvant (42.16 g ha-1), then in case when adjuvant Dassoil added (13.96 g ha-1).Reakcije korovske vrste Avena fatua L. na piroksulam su ispitivane u saksijama na otvorenom polju. Primena piroksulama je obavljena kada su biljke dostigle visinu od 15-20 cm. Herbicid je primenjen u 5 različitih količina (150g ha-1; 112,5 g ha-1; 75 g ha-1; 37,5 g ha-1 i 18,75 g ha-1) i to u varijanti bez okvašivača i uz dodatak okvašivača Dassoil u količini od 500 ml ha-1, a kontrola nije tretirana. Za procenu reakcija biljaka na primenu rastućih količina piroksulama mereni su i analizirani sledeći parametri: vizuelna ocena oštećenja (7 i 14 dana nakon primene herbicida), sveža i suva masa biljaka (14 dana nakon primene herbicida). Reakcije A. fatua na piroksulam bile su različite u zavisnosti od količine primene herbicida, dodatka okvašivača i ispitivanog parametra. Dobijeni rezultati su potvrdili opravdanost dodavanja okvašivača, s tim što je njegov uticaj na efekat piroksulama bio uočljiviji na osnovu ED50 vrednosti. Naime, ED50 vrednost za svežu masu je bila znatno veća u slučaju primene piroksulama bez dodatka okvašivača (42,16 g ha-1), nego u slučaju kada je dodat okvašivač Dassoil (13,96 g ha-1)