Navegando por Autor "Pires, José Luis Mailkut"

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    Volatilidade de herbicidas em duas condições ambientais controladas
    (Universidade Estadual do Norte do Paraná, 2016-09-27) Pires, José Luis Mailkut; Oliveira, Rone Batista de; https://orcid.org/0000-0002-3071-4827; http://lattes.cnpq.br/2379804514613050; Oliveira, Rone Batista de; https://orcid.org/0000-0002-3071-4827; http://lattes.cnpq.br/2379804514613050; Sachs, Luís Guilherme; https://orcid.org/0000-0002-9026-483X; http://lattes.cnpq.br/8396109344405837; Abi-Saab, Otávio Jorge Grigoli; http://lattes.cnpq.br/8437035647330384; Gandolfo, Marco Antônio; https://orcid.org/0000-0003-2314-3752; http://lattes.cnpq.br/5560552732033631; Antuniassi, Ulisses Rocha; http://lattes.cnpq.br/9754851029548502
    Volatilisation can reduce herbicide efficacy for weed control and cause environmental contamination as well as phytotoxicity in sensitive crops, because environmental conditions at the time of application strongly influence the process. This study aimed to evaluate the effect of two controlled relative humidity levels on herbicide volatilisation. The experiment used a completely randomised design with five replications. Volatilisation of the herbicides 2,4‑D, trifluralin, haloxyfop‑P‑methyl, glyphosate, and clomazone was assessed at seven intervals (1 h, 2 h, 3 h, 4 h, 5 h, 6 h, and 7 h after application), under two relative humidity regimes (47% and 70%, both ±2%) and constant temperature (25 °C ±2 °C). Volatilisation was measured according to the Brazilian Association of Technical Standards — ABNT (Standard NBR 13238:2014) and expressed as the percentage of active ingredient lost through volatilisation. Volatilisation increased over time and stabilised for all herbicides three hours after deposition. Reporting relative humidity is therefore recommended in standard herbicide volatilisation testing, because increasing humidity from 47% to 70% reduced trifluralin volatilisation. The ranking for decreasing volatilisation was: haloxyfop‑P‑methyl > glyphosate > 2,4‑D > trifluralin = clomazone.