Interação de boro na calda de herbicidas em pré-emergência

Abstract

Weed control is essential for high agricultural productivity. One of the techniques used is tank mixing, where the products are applied just before application, potentially posing physical and chemical compatibility issues. Therefore, this study aimed to evaluate weed control when using boron-based fertilizers mixed with pre-emergent herbicides. Therefore, a completely randomized design (CRD) and factorial statistical arrangement based on the mechanism of action were used in a greenhouse at the Production Technology Laboratory on the CECA/UFAL Campus of Agricultural Sciences and Engineering. The experiment consisted of four replicates and a commercially formulated mixture of herbicides, each with the following mechanisms of action: ALS: Diclosulam, Imazapique, and Metsulfuron-methyl; Protox: Oxifluorfen, Sulfentrazone, and Flumioxazine; PSII: Amicarbazone, Hexazinone, and Tebuthiuron; Initial growth: Pyroxasulfone and S-metolachlor; Carotenoid biosynthesis: Clomazone and isoxaflutole; Carotenoid+cellulose biosynthesis: Isoxaflutole+indaziflam. The weed species used were: Ipomoea hederifolia, Euphorbia hyssopifolia, Digitaria spp., and Megathyrsus maximus. All treatments were administered pre-emergence, isolated and mixed, with boron (B), using four sources. The following spray variables were evaluated before application: Hydrogen potential (pH) of the sprays, isolated and mixed; Spray solubility, immediately after mixing, at 1, 5, 10, and 30 min, using the Jar Test. After application, the Signal Test was performed. The efficacy variables: % Visual control by weed species at 15, 30, and 45 days after application (DAA) and % Dry mass. The results found demonstrate the possibility of applying B in the pre-emergent herbicide spray, in tank mix, to control the target species worked, 45 DAA. Keywords: Combination; micronutrient; chemical control.