EFFECTIVENESS AND SELECTIVITY OF FLUMIOXAZIN HERBICIDE IN PRÉ-EMERGENCY ON ONION CULTURE TRANSPLANTED

Abstract

The work was carried out to evaluate the herbicide flumioxazin performance compared to commercial patterns applied in pre-emergency in the transplanted onion culture. Field trials were carried out in Monte Alto, SP, arranged in a randomized complete block design with four repetitions. The used herbicides were: flumioxazin (0,080; 0,120; 0,180; 0,240 kg ha-1), oxadiazon + linuron (0,500 + 0,900 kg ha-1), linuron (1,350 kg ha-1) and oxadiazon (0,75 kg ha-1). Two controls also were maintained, one with and other without weed control during all the culture cycle. The portions consisted of four spaced lines of 0,36 m and three meters in length each, totalling 4,32 m2 area. Were considering useful the three central lines. The distance among plants in the line was 0,36 m. All the herbicides were considered excellent for the Lepidium virginicum control, standing out flumioxazin (100%) in all the dosages, until the 80 days after application (DAA), with great selectivity for the culture. The plants recovered well of the initial symptoms of the oxadiazon (0,750 kg ha-1). The mixture oxadiazon + linuron (0,500 + 0,900 kg ha-1) as well as isolated linuron (1,350 kg ha-1), promoted fitotoxicity varying moderate to medium.