Efficiency study of sethoxidim in controlling little canarygrass (Phalaris minor Retz.) and winter wild oat (Avena ludoviciana Durieu) in presence of different salts and ammonium sulfate

Two greenhouse experiment were conducted at Agrecultural Faculty of Ferdowsi University to study the efficiency of sethoxidim in controlling little canarygrass and winter wild oat in presence of different salts and ammonium sulfate. The treatments were consisted of three doses of sethoxidim (187.5, 93.75, and 48.87 g a.i ha-1), five different salts, each at 500 mgL-1 and deionized water as a control. The percentage of survival and dry weight of the plants were assessed 21 days after treatment. The results showed that several inorganic salts added to the spray solution significantly reduced the efficacy of sethoxydim in wild oat and canarygrass. However, type of salt that had a maximum negative effect on the performance of sethoxydim was different between two weeds. Increasing in the sethoxydim dose lead to overcome the negative effects of the presence of salts in the spray solution. While, the application of ammonium sulfate had little effect to prevent antagonistic effects of salts in the tank sprayer, particularly on canarygrass.