Banca de DEFESA: AMANDA DE MORAES AZEVEDO PEREIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : AMANDA DE MORAES AZEVEDO PEREIRA
DATE: 27/02/2025
TIME: 08:30
LOCAL: Online
TITLE:

Selectivity and efficacy of pre-emergent herbicides in soybean crops

KEY WORDS:

Glycine max; phytotoxicity; GST; productivity

PAGES: 59
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitotecnia
SPECIALTY: Matologia
SUMMARY:

Herbicide selectivity is essential for the effectiveness of chemical weed control; however, it depends on the interactions between the herbicide, the crop and the soil and climate conditions. Therefore, the objective of this study was to evaluate the selectivity of the most commonly used pre-emergent selective herbicides in soybean crops in two distinct cultivars. Two experiments were carried out in different locations: in a greenhouse and in the field. In the greenhouse, 5-L pots containing a sandy-clayey soil mixture were used. This experiment was conducted in a completely randomized design with 6 replicates. Two soybean cultivars were used: Brasmax Olimpo 80I82RSF IPRO and Brasmax Exata 64IX60RSF I2X. The treatments applied were: control (no application), Kyojin (120+ 80 g a.i.ha-1), Yamato (150 g a.i.ha-1), Spider (35.38 g a.i.ha-1), Stone (245+490 g a.i.ha-1), Boral (400 g a.i.ha-1), Flumyzin (50 g a.i.ha-1), Zethamaxx (120+60 g a.i.ha-1), Arkeiro (25+50+100 g a.i.ha-1) and Allus (300+80 g a.i.ha-1). In experiment II, in the field, the same herbicides were used and a randomized block design with 4 replications was adopted. In EI, visual analyses of phytotoxicity and transient chlorophyll a fluorescence were performed at 14, 21, 28 and 35 days after application (DAA). In addition to analyzing the activity of the enzyme Glutathione S-transferase when the plant reached the vegetative stage V2 and dry mass of aerial part at the end of the experiment. In experiment II, visual analyses of phytotoxicity and weed control were performed at 14, 21, 28 and 35 DAA. Under EI conditions, all herbicides were selective for both cultivars. Under EII conditions, all treatments were selective for the Olimpo cultivar, and for the Exata cultivar, the herbicides Stone, Boral and Arkeiro presented phytotoxicity considered unacceptable. It is concluded that the Olimpo cultivar, when compared to Exata, was more tolerant to herbicides. However, productivity analyses will be performed to corroborate the other data.

COMMITTEE MEMBERS:
Interna - 2466219 - CAMILA FERREIRA DE PINHO
Externo ao Programa - 1905333 - AROLDO FERREIRA LOPES MACHADO - UFRRJExterno à Instituição - Paulo Vinicius da Silva