Avaliação do efeito do método físico, químico e mecânico no controlo da tiririca (Cyperus rotunds L.) na cultura do milho (Zea mays L.)

Abstract

The objective of this work was to evaluate the effect of physical, chemical, and mechanical methods on the control of nutsedge (Cyperus rotundus L.). For this purpose, a field experiment was conducted at the Cooperativa 25 de Setembro and laboratory at FAEF / UEM, from March to June 2012. The experimental design used was complete randomized blocks, with 5 treatments and 4 repetitions. The treatments studied were: T1: fire; T2: pendimentalin + glyphosate; T3: MCPA + glyphosate; T4: weeding; and T5: control. The density of the nutshell, the percentage of nutshell control, the time of application of the treatments, the percentage of germination and the fresh and dry weight of the nutshell tubers, the weight of the nutshell aerial biomass were evaluated. In relation to corn, height and yield were evaluated, and costs associated with treatments were also analyzed. The results showed that the herbicides provided the best control of sedge, with 97% control at 30 ADI in the treatment with pendimentalin + glyphosate. The application of herbicides spent less time and with lower production costs. Hoeing required more time and resources in manpower. It was also found that the use of herbicides significantly reduced the germination percentage of the nutsedge tubers, the weight of the tubers and their aerial biomass. Regarding the corn yield, the best results were observed in the treatment with MCPA + glyphosate (4.8 ton / ha) and the minimum yield was observed in the control (1.8 ton / ha), concluding that the performance of weed control reduces the fraction of weeds. nutrients that are lost by the crop to the detriment of weeds(TRADUÇÃO NOSSA)