Controle de plantas daninhas em citros, interação entre roçadoras e herbicidas

Abstract

Weeds are considered the most limiting biotic factor to production agricultural world, and in citrus, ecological mowing proved to be a viable management option; however, there is a lack of information regarding the interaction with other types of control and with residual herbicides. This study aimed to evaluate over an agricultural year (2022/2023), in an orchard formed by Hamlin orange, the interrow mowings: ecological (ECO) and conventional (CONV); and five weed control programs among citrus plants: mechanical (CM); pre-emergent herbicides (PRE): sulfentrazone (spring), indaziflam (summer); post-emergence (POS): glyphosate (spring), saflufenacil+clethodim (summer); mix between pre and post (PRE+POST): sulfentrazone+glyphosate (spring), indaziflam+saflufenacil+clethodim (summer); and the pre and post duality herbicides (P/P): flumioxazin+glyphosate (spring) and diuron+clethodim (summer). The experimental design was randomized blocks, in a split-plot scheme, with four replications. The plot was composed by the mowing types, and the subplot, by the weed control types. The following were evaluated: biomass deposition, weed control, and the crop development. As main results, ECO associated with PRE, PRE+POST or P/P promoted greater weed control throughout the year (~100%), in addition to greater growth (+4 m³) and fruit yield (+15 t ha-1). It is concluded that there is a positive interaction between ecological mowing and different methods of weed control, physical or chemical.