The resistance of Sagittaria trifolia populations in rice fields from Liaoning Province to bensulfuron-methyl Effects of different doses of bensulfuron-methyl·butachlor and quinclorac on the growing environment and nutrient accumulation of Chinese milk vetch SYNTHESIS OF ( 14 C 4 PYRIMIDINYL) BENSULFURON METHYL Resistant Monochoria korsakowii biotypes to bensulfuron-methyl and their acetolactate synthase sensitivity