Controle de plantas daninhas na cultura do Guaranazeiro com herbicidas, e seus efeitos sobre Bioindicadores

Abstract

The Knowledge of changes in the weed community procvocated by weed management is important for the definition of efficient strategies to their control. Was perforned a field experiment to evaluate the effects of the herbicide of the 16 herbicide used on weed control in the guaraná crop, and the effects on dry matter production in the guaraná crop. In this research were used herbicides and their respective dose, expressed in g iaha-1: linuron 900, Atrazine 2500 bentazone 900, ethyl carfentrazone 100, Atrazine (amine) 1750, paraquat 1200 + diuron 300, paraquat 600, setoxidim 230, glyphosate 1557, Nicosulfurom, phenoxaprope-P-ethylic 250, Metribuzin 720, Flumioxazine 125, 2-4D 300, Haloxyfop-P-methyl 50, clomazone 72, mechanical weeding and without weeding, the design was in a randomized block with 18 treatments and four replicates , each plot being composed of four guaraná plants in the useful area. Before application of the herbicide syrup, the area was scrubbed to standardize the weed population; when the weeds were 30 cm high, the treatments were applied with a costal sprayer with a capacity of 20 L, with spray tips of the type 110.02. The effect of herbicides on guaraná and weed plants was evaluated in the grading scale, evaluated the percentage of weed control in relation to control, severity of anthracnose, flowering, germination of pollen grain, caffeine, theobromine, theophylline and yield of guaraná in the farm Santa Helena, Maués-AM. For the comparisons of means were done joint analysis (2016-2017) by the Scott-Knott test (p≤0.05) probability using the assistat software. The treatments linuron indicates good agronomic yields during the period of evaluation in general it stands out in the other treatments.