Development of a Preemergent Nanoherbicide: From Efficiency Evaluation to the Assessment of Environmental Fate and Risks to Soil Microorganisms

Autor(es)

Takeshita, Vanessa ; Carvalho, Lucas Braganccommaa ; Galhardi, Juliana Aparecida ; Munhoz-Garcia, Gustavo Vinicios ; Pimpinato, Rodrigo Floriano ; Oliveira, Halley Caixeta ; Tornisielo, Valdemar Luiz ; Fraceto, Leonardo Fernandes

• Tipo de documento: Artigo Científico
• Fonte: ACS NANOSCIENCE AU; v. 2, n. 4, p. 17-pg., 2022-08-17.

Resumo

Nanoparticles based on biodegradable polymers have been shown to be excellent herbicide carriers, improving weed control and protecting the active ingredient in the crop fields. Metribuzin is often found in natural waters, which raises environmental concerns. Nanoencapsulation of this herbicide could be an alternative to reduce its losses to the environment and improve gains in its efficiency. However, there is a paucity of information about the behavior of nanoformulations of herbicides in environmental matrices. In this study, the stability of nanoencapsulated metribuzin in polymeric nanoparticles (nanoMTZ) was verified over time, as well as its dissipation in different soils, followed by the effects on soil enzymatic activity. The physiological parameters and control effects of nanoMTZ on Ipomoea grandifolia plants were investigated. No differences were verified in the half-life of nanoencapsulated metribuzin compared to a commercial formulation of the herbicide. Moreover, no suppressive effects on soil enzymatic activities were observed. The retention of nanoMTZ in the tested soils was lower compared to its commercial analogue. However, the mobility of nanoencapsulated metribuzin was not greatly increased, reflecting a low risk of groundwater contamination. Weed control was effective even at the lowest dose of nanoMTZ (48 g a.i. ha(-1)), which was consistent with the higher efficiency of nanoMTZ compared to the conventional herbicide in inhibiting PSII activity and decreasing pigment levels. Overall, we verified that nanoMTZ presented a low environmental risk, with increased weed control. (AU)

• Processo FAPESP: 17/21004-5 - Agricultura, micro/nanotecnologia e ambiente: da avaliação dos mecanismos de ação a estudos de transporte e toxicidade
• Beneficiário: Leonardo Fernandes Fraceto
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/04758-1 - Nanopartículas como sistema carreador de herbicidas aplicados em pré-emergência em solos oriundos de sistema de plantio direto e convencional
• Beneficiário: Vanessa Takeshita
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/23608-8 - Desenvolvimento de nanopesticidas marcados com sondas fluorescentes para estudos de mecanismo de ação e toxicidade
• Beneficiário: Lucas Bragança de Carvalho
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 20/12644-3 - Comportamento de herbicidas pré-emergentes em palhadas de diferentes plantas de cobertura
• Beneficiário: Gustavo Vinícios Munhoz Garcia
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 17/15220-7 - Métodos de análise de imagens não destrutivos para avaliação da qualidade de sementes
• Beneficiário: Clíssia Barboza Mastrangelo
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores