Associação de programas de controle de plantas daninhas para a roçagem ecológica em citros
Abstract
Brazil is the second largest citrus producer in the world, reaching
production of 19.6 million tons in the 2019 harvest, but it is the largest global producer
of oranges with production of 262.97 million boxes. However, the productivity of
culture can present great variation due to the influence of biotic factors, such as
weeds that stand out as one of the most limiting aspects. the mowing
ecological has proved to be an interesting option to control weeds
in citrus orchards, however, lacks information about the interaction with other
types of control and with residual herbicides. In this way, the present work
aimed to determine the proper management of weeds, through
use of mulch with integration of weed control methods more
suitable. The experimental design used was randomized blocks,
with four replications in a split-plot scheme, in which the
plots were divided by different types of mowing: ecological (ECO) and
conventional (CONV); and the subplots divided by control strategies (TEST,
mechanical control (CM), pre-emergent herbicides (PRE), post-emergent herbicides (POST), the mixture of pre- and post-emergent (PRE+POST), and duality herbicides
pre- and post-emergence (P/P). The following were evaluated: biomass deposition, density
of weeds, and for citrus plants, the canopy volume, productivity and
productive efficiency. The ECO treatment promoted greater deposition of biomass in the
planting row, obtaining a significant effect on weed control.
Associated with ECO, the PRE control programs and PRE+POST method are
highlighted with the best results in relation to plant density. How much
to vegetative development, there were no variations, however, the use of PRE+POST
associated with ECO promoted greater production for citrus plants. It is concluded that
there is a positive interaction between ecological mowing with different modalities
of weed control, physical or chemical, but that the use of herbicides
residuals together with post-emergent ones promotes greater control of plants
weeds over time and productivity of Hamlin orange plants.
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