SYMPOSIA PAPER Published: 01 April 2024
STP165120230019

Adjuvants Enhancing the Residual Activity of Soil-Applied Herbicides

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The world population reached 7.7 billion in 2022 and is expected to reach around 10 billion by 2050. One of the major challenges in crop systems is weed competition, which increases resistance against current herbicides and negatively impacts the food supply. Preemergence herbicides play a vital role in reducing weed seed banks in the soil. Their effectiveness is enhanced when used in conjunction with post-emergence herbicides. This combined approach controls weed growth over an extended period, ensuring crop yields. It has a notable effect on soybean and corn crops, especially in the Americas. Although the active principle represents the central aspect in crop protection, it is known that the formulation technology, application technology, and association of tank-mix adjuvants can be fundamental tools to guarantee the achievement of the targeted and prolonged effectiveness of improving the control of weeds. Therefore, the aim of this research is to assess the performance of (S)-metolachlor when used with tank-mix adjuvants possessing various physical and chemical properties. Additionally, it aims to evaluate the physical and chemical properties of surfactants, with the goal of identifying a property that can predict the characteristic that enhances the herbicide residue in the soil. The findings of this study indicate that certain classes of adjuvants significantly enhance the residue of (S)-metolachlor in the soil, thereby extending the control of sourgrass and goosegrass to up to double the duration compared to when the product is applied alone. These adjuvants can be utilized in both tank-mix adjuvants and formulations such as oil-based or aqueous suspensions and emulsions.

Author Information

Gonçalves, Heloisa
Research and Development, Crop Solutions, Indorama Ventures Integrated Oxides & Derivatives S.A., BR
Mendonça, Bruna
Research and Development, Crop Solutions, Indorama Ventures Integrated Oxides & Derivatives S.A., BR
Pereira de Almeida, Gabriela
Research and Development, Crop Solutions, Indorama Ventures Integrated Oxides & Derivatives S.A., BR
Ramos Junior, Edson, Cardoso
Technical Services & Development, Crop Solutions, Indorama Ventures Integrated Oxides & Derivatives, The Woodlands, TX, US
Jurca Grigolli, José, Fernando
Famiva Pesquisa e Soluções Agrícolas, BR
Favaro, Cintia
Research and Development, Crop Solutions, Indorama Ventures Integrated Oxides & Derivatives S.A., BR
Sobral Dezotti, Rafael
Research and Development, Crop Solutions, Indorama Ventures Integrated Oxides & Derivatives S.A., BR
Maravilha Mendes, Pedro
Research and Development, Crop Solutions, Indorama Ventures Integrated Oxides & Derivatives S.A., BR
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Pages: 81–99
DOI: 10.1520/STP165120230019
ISBN-EB: 978-0-8031-7750-5
ISBN-13: 978-0-8031-7749-9