Seletividade de herbicidas pós-emergentes isolados ou associados a fertilizante foliar na cultura da soja

Erica da Silva de Alencar; Mariana Lescano Geist; João Paulo Morales Pereira; Bruna Ferrari Schedenffeldt; Felipe Alves Nunes; Paulo Vinicius da Silva; Elisângela Dupas; Munir Mauad; Patrícia Andrea Monquero; Elias Silva de Medeiros

doi:10.5965/223811712142022384

Authors

Erica da Silva de Alencar Federal University of Dourados Region https://orcid.org/0000-0001-8537-5888
Mariana Lescano Geist Federal University of Dourados Region https://orcid.org/0000-0003-2160-4287
João Paulo Morales Pereira Federal University of Dourados Region https://orcid.org/0000-0002-1543-8393
Bruna Ferrari Schedenffeldt Federal University of São Carlos https://orcid.org/0000-0002-2099-3690
Felipe Alves Nunes Federal University of São Carlos https://orcid.org/0000-0002-5655-7911
Paulo Vinicius da Silva Federal University of Dourados Region https://orcid.org/0000-0003-4647-5602
Elisângela Dupas Federal University of Dourados Region https://orcid.org/0000-0001-6862-2699
Munir Mauad Federal University of Dourados Region https://orcid.org/0000-0003-4119-5783
Patrícia Andrea Monquero Federal University of São Carlos https://orcid.org/0000-0002-9123-1861
Elias Silva de Medeiros Federal University of São Carlos https://orcid.org/0000-0002-9694-4019

DOI:

https://doi.org/10.5965/223811712142022384

Keywords:

phytotoxicity, tank mix, foliar fertilization, fertilizers, herbicides, soybeans

Abstract

Herbicides and foliar fertilizers are commonly associated in soybean crops. However, these mixtures can cause different effects on the plants, therefore requiring further studies. Herein, we assess the selectivity of post-emergence herbicides associated with foliar fertilizer (FF) in soybean crops (Roundup Ready). The experiment was carried out in a randomized block design with four replications. The treatments applied were: chlorimuron (17.5 g a.i. ha^-1), chlorimuron + FF (17.5 + 693 g a.i. ha^-1), cloransulam (40 g a.i. ha^-1), cloransulam + FF (40 + 693 g a.i. ha^-1), fomesafen (225 g a.i. ha^-1), fomesafen + FF (225 + 693 g a.i. ha^-1), glyphosate (1,280 g a.i. ha^-1), glyphosate + FF (1,280 + 693 g a.i. ha^-1), and two controls, being one with manual weeding and the other without weed control. Visual assessments of phytotoxicity and chlorophyll index were carried out weekly from seven to thirty-five days after applying the treatments (DAA). In these periods, chlorophyll levels were also assessed. In addition, the yield, 1000-grain weight, and moisture data were assessed at the end of the crop cycle. Phytotoxicity was higher than 30% when cloransulam and chlorimuron were applied, while phytotoxicity was close to 5% for fomesafen and glyphosate, either in the absence or presence of foliar fertilizer. There was no significant difference in grain yield, 1000-grain weight, and moisture. The association of herbicides with zinc-based foliar fertilizer did not influence the selectivity of post-emergence herbicides applied to the RR soybean.

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Selectivity of post-emergence herbicides and foliar fertilizer in soybean crop

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