Banca de QUALIFICAÇÃO: JULIA RODRIGUES NOVAIS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : JULIA RODRIGUES NOVAIS
DATA : 19/09/2022
HORA: 13:30
LOCAL: Google Meet
TÍTULO:

DYNAMICS OF PYROXASULFONE IN SOILS WITH CONTRASTING TEXTURES

PALAVRAS-CHAVES:

herbicide, bioindicators, leaching, residual

PÁGINAS: 39
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Fitossanidade
ESPECIALIDADE: Defesa Fitossanitária
RESUMO:

The use of herbicides has contributed to the expansion of agriculture, which are used to control weeds and their behavior in the environment is influenced by several factors. Prolonged permanence and excessive leaching of herbicides can cause environmental and economic damage. Pyroxasulfone and pyroxasulfone + flumioxazin are herbicide molecules with residual activity recently registered in Brazil and, therefore, it is necessary to gather information about their behavior in the environment. In this sense, the use of bioindicator plants is an affordable and effective alternative for the detection of herbicide molecules in the soil. The objective of this work was to evaluate the sensitivity of lettuce, cucumber and sorghum to the herbicides pyroxasulfone and pyroxasulfone + flumioxazin in order to determine the species with the highest bioindicator potential in soils with different textures, as well as its behavior in the environment through the analysis of the leaching potential. and residual effect. It was found that lettuce was the most sensitive species selected for both herbicides and therefore is the most recommended for soil studies with pyroxasulfone and pyroxasulfone + flumioxazin. Cucumber and sorghum also proved to be potential candidates as bioindicators and could also be used in bioassays for these herbicides. Furthermore, it was found that increasing irrigation depths provided leaching to a depth of 20-25 cm for pyroxasulfone alone and in association with flumioxazin. When water depths of 90 mm were applied, greater interference was observed in the development of cucumbers in the deeper layers, evidencing the greater leaching of herbicides when subjected to intense rainfall.

MEMBROS DA BANCA:
Presidente - 221918004 - MIRIAM HIROKO INOUE
Interno - 118802007 - HILTON MARCELO DE LIMA SOUZA
Externo ao Programa - 253848001 - ANA CAROLINA DIAS GUIMARAES