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

Abstract

The area planted with sorghum (Sorghum bicolor (L.) Moench) in Brazil has grown a lot, and, along with this growth in, its demand for herbicides of pre and post-emergence increased. In this context, this work aimed to evaluate the efficiency of the use of herbicides to control weeds and its influence on the characteristics of growth and productivity of sorghum crop. The experiment was intaled in rainfed conditions, carried out in field conditions, in the Department of Plant Pathology of the Center for Agricultural Sciences (CCA), Campus II from the Federal University of Paraiba (UFPB), located in the municipality of Areia-PB. The experiment was arranged in a randomized block design, where the treatments were composed of dosages of herbicides pre and post-emergent, Herbadox® 400 EC and the DMA® 806 BR, alone and in combination (T1: Without weeding, T2: weeding, T3: Herbadox (50 % ), T4: Herbadox (100 % ), T5: DMA (50 % ), T6: DMA (100 % ), T7: Herbadox (50 %) + DMA (50 % ), T8: Herbadox (100 %) + DMA (100 % ), T9: Herbadox (50 %) + DMA (100 % ), T10: Herbadox (100 %) + DMA (50 % ), which were applied to 21. The variables analyzed were plant height, diameter of stem and number of leaf every 15 days, and productivity. It is concluded that the variables plant height and diameter of stem presented the best values with the application of the herbicides Herbadox 50% and DMA 50% and 100 %; The development of the sorghum plants do not have reached height and diameter desired in the period of the assessments. The treatments with application of Herbadox® (50 and 100 % ), mixtures Herbadox® (50 %) + DMA® (50 %) and Herbadox® (100 %) + DMA® (50 % ), and with weeding, showed a higher number of green leaves; Applications with DMA (50 and 100%) showed the best results in the production of grain sorghum.