INFLUÊNCIA DO USO DE HERBICIDAS SOB AS CARACTERÍSTICAS DE CRESCIMENTO E PRODUÇÃO DO SORGO FORRAGEIRO (Sorghum bicolor (L.) Moench)

Abstract

The sorghum (Sorghum bicolor (L.) Moench) has shown tremendous growth in recent years, it has great potential both productive and economical for agriculture in various regions of Brazil, especially in regions where rainfall is scarce or irregular, and with this growth comes the culture will demand for pre and post-emergence herbicides in order to reduce the damage caused by plants that compete directly with the culture. This study aimed to evaluate the efficiency of the use of herbicides in weed control and its influence on growth characteristics and production of the sorghum crop. The experiment in rainfed conditions with irrigation salvation was conducted under field conditions, the Department of Agronomy at the Center for Agricultural Sciences (CCA), Campus II of the Federal University of Paraiba (UFPB), located in the City of Areia-PB. The experiment was arranged in a randomized block design, where treatments were constituted of pre and post-emergence herbicide dosages, Herbadox® 400 EC and the DMA® 806 BR applied alone and in combination where: (T1: control, T2: weeded, T3: DMA (100%) T4: DMA (150%), T5: Herbadox (100%) T6: Herbadox (150%) T7: DMA (100%) Herbadox + (150%), T8: DMA (150%) Herbadox + (100%), 9T: DMA (150%) Herbadox + (150%)), which were applied at 15 DAS. The stem diameter variables were analyzed, plant height, and the number of green leaves every 10 days, and total production per treatment. We conclude that the height variable, did not own characteristics and values to differentiate from the others who did not have the use of herbicides in cultivation; Sorghum plants reached a desired development in height and diameter in the periods were evaluated; The higher number of leaves was obtained witness in the weeded treatment and treatment with application of DMA® (100%); The weed control was greater when weeded, and was more efficient in treatments with herbicides DMA® (100% and 150%), and the DMA® mixtures (100%) + HERBADOX® (150%) and DMA® (150%) HERBADOX® + (150%); The phytotoxicity in treatments with the application of DMA® (100% and 150%) and HERBADOX® (150%) was considered low or zero; Applications with DMA® (100%) and HERBADOX® (100%) showed the best results in the production of grains.