In 2008–2009 at Crop Production Department in WUELS field investigation were carried out and phytotoxicity of the tested herbicide was assessed. Maize and forage soybean were sown in pure culture and intercropped. Directly after sowing 3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea – linuron (900 g a.s. per ha) was applied. Phytotoxicity was assessed (as percentage of modified plants) 30 days after sowing (DAS). Weather conditions had high influence on linuron phytotoxicity. Intensive rainfall after sowing – 18 mm on sowing days, (64.1 mm during 21 days after sowing) significantly increased the number of soybean plants with necrosis or completely destroyed. Shallow soybean sowing method increased the percentage of deformed plants.
The study was conducted in 2009 in the Agricultural Experimental Station in Kępa near Puławy. Obtained results are presented in tables 1 and 3. Significant differences in efficiency of Proponit 720 EC against individual weed species were observed for different doses of the preparation. Proponit 720 EC applied alone at the dose 6 l/ha after sowing exerted the best efficiency. The herbicide applied at the dose 6.0 l/ha did not cause phytotoxic effects on maize crop.