Abstract
Weed management in the pre-transplantation of coffee plants is an essential condition for the future success of the crop. Currently, the producer has few options to perform chemical management at this stage. Therefore, one of the solutions that is being used is the tank mixing of products proven efficient with new products on the market, such as indaziflam. The objective of this study is to know the selectivity of indaziflam, associated or not with oxyfluorfen, in coffee pre-planting and its effectiveness in weed control. Thus, the following treatments were tested in the field: indaziflam (25 g ha<sup>-1</sup> a.i.), indaziflam (50 g ha<sup>-1</sup> a.i.), oxyfluorfen (960 g ha<sup>-1</sup> a.i.), indaziflam (25 g ha<sup>-1</sup> a.i.) + oxyfluorfen (960 g ha<sup>-1</sup> a.i.), indaziflam (50 g ha<sup>-1</sup> a.i.) + oxyfluorfen (960 g ha<sup>-1</sup> a.i.), plus a weeded and a non-weeded control. All treatments caused low intoxication in the seedlings, but without impairing the development and orphological variables of the plants. The treatments were efficient in controlling the species <em>Bidens pilosa L</em>., <em>Commelina benghalensis</em> L., <em>Urochloa decumbens</em>, <em>Emilia fosbergii</em> and <em>Melampodium perfoliatum</em> until 68 days after application. At 104 days, it was observed that there was a reduction in the efficiency of the products. It is concluded that the associated use of indaziflam and oxyfluorfen does not cause intoxications capable of interfering with the development of coffee plants. The association of these herbicides or their isolated applications is efficient in the control of weeds in the pre-transplantation of coffee plants, and the choice of the best management strategy is dependent on the weed community present in each area.
Highlights
Brazil is the world’s largest coffee producer, exporter and consumer
Weed infestation in coffee plantations can result in losses to the producer, as both compete for water and nutrients for their growth and development (Agostinetto et al, 2008)
The treatments consisted of the application of the herbicides at the respective doses: indaziflam (25 g ha-1 a.i.), indaziflam (50 g ha-1 a.i.), oxyfluorfen (960 g ha-1 a.i.), indaziflam (25 g ha-1 a.i.) + oxyfluorfen (960 g ha-1 a.i.), indaziflam (50 g ha-1 a.i.) + oxyfluorfen (960 g ha-1 a.i.), as well as a weeded and a non-weeded control
Summary
The success of coffee agribusiness is conditioned by the rational use of several production factors, such as fertilization (Burak et al, 2012; Serafim et al, 2011), irrigation (Martins et al, 2007; Oliveira et al, 2010) and phytosanitary management (Silva et al, 2018; Santos et al, 2014; Silva et al, 2012; Fernandes, 2009). In this context, weed management is extremely important, since it reduces the competition that weeds have with the crop by diverse growth factors, besides preserving the soil and extending the useful life of the coffee trees (Cogo et al, 2013; Alcãntara & Ferreira, 2000). It is necessary to know the weed species that are most frequent, in order to carry out an adequate control recommendation (Rocha et al, 2017)
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