Availability of Metribuzin-Loaded Polymeric Nanoparticles in Different Soil Systems: An Important Study on the Development of Safe Nanoherbicides

Author(s)

Takeshita, Vanessa ; Munhoz-Garcia, Gustavo Vinicios ; Pinacio, Camila Werk ; Cardoso, Brian Cintra ; Nalin, Daniel ; Tornisielo, Valdemar Luiz ; Fraceto, Leonardo Fernandes

• Document type: Journal article
• Source: PLANTS-BASEL; v. 11, n. 23, p. 17-pg., 2022-12-01.

Abstract

Nanoformulations have been used to improve the delivery of fertilizers, pesticides, and growth regulators, with a focus on more sustainable agriculture. Nanoherbicide research has focused on efficiency gains through targeted delivery and environmental risk reduction. However, research on the behavior and safety of the application of these formulations in cropping systems is still limited. Organic matter contained in cropping systems can change the dynamics of herbicide-soil interactions in the presence of nanoformulations. The aim of this study was to use classical protocols from regulatory studies to understand the retention and mobility dynamics of a metribuzin nanoformulation, compared to a conventional formulation. We used different soil systems and soil with added fresh organic material. The batch method was used for sorption-desorption studies and soil thin layer chromatography for mobility studies, both by radiometric techniques. Sorption parameters for both formulations showed that retention is a reversible process in all soil systems (H similar to 1.0). In deep soil with added fresh organic material, nanoformulation was more sorbed (14.61 +/- 1.41%) than commercial formulation (9.72 +/- 1.81%) (p < 0.05). However, even with the presence of straw as a physical barrier, metribuzin in nano and conventional formulations was mobile in the soil, indicating that the straw can act as a barrier to reduce herbicide mobility but is not impeditive to herbicide availability in the soil. Our results suggest that environmental safety depends on organic material maintenance in the soil system. The availability can be essential for weed control, associated with nanoformulation efficiency, in relation to the conventional formulation. (AU)

• FAPESP's process: 22/00718-8 - Glyphosate carrier nanosystems: from development to application in weed management
• Grantee: Gustavo Vinícios Munhoz Garcia
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 19/04758-1 - Nanoparticles as a carrier of herbicides applied in pre-emergency system in soils derived from no-tillage and conventional
• Grantee: Vanessa Takeshita
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 17/21004-5 - Agriculture, micro/nanotechnology and environment: from evaluation of the mechanisms of action to studies of transport and toxicity
• Grantee: Leonardo Fernandes Fraceto
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 21/03455-5 - Straw-herbicide interaction in no-tillage system: effects of pre-emergent herbicides on the control of slender amaranth
• Grantee: Camila de Werk Pinácio
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 22/01554-9 - Impacts of metribuzin nanoformulation application on soil non-target organisms
• Grantee: Brian Cintra Cardoso
• Support Opportunities: Scholarships in Brazil - Scientific Initiation