Controlled release herbicide formulation for effective weed control efficacy
Abstract Controlled release formulation (CRF) of herbicide is an effective weed management technique with less eco-toxicity than other available commercial formulations. To maximise the effectiveness of CRFs however, it is crucial to understand the herbicide-releasing behaviour at play, which predom...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-02-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-024-53820-8 |
| _version_ | 1797274601275785216 |
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| author | Santosh Kumar Paul Yunfei Xi Peter Sanderson Ravi Naidu |
| author_facet | Santosh Kumar Paul Yunfei Xi Peter Sanderson Ravi Naidu |
| author_sort | Santosh Kumar Paul |
| collection | DOAJ |
| description | Abstract Controlled release formulation (CRF) of herbicide is an effective weed management technique with less eco-toxicity than other available commercial formulations. To maximise the effectiveness of CRFs however, it is crucial to understand the herbicide-releasing behaviour at play, which predominately depends on the interaction mechanisms between active ingredients and carrier materials during adsorption. In this study, we investigated and modelled the adsorption characteristics of model herbicide 2,4-D onto two organo-montmorillonites (octadecylamine- and aminopropyltriethoxysilane-modified) to synthesise polymer-based CRFs. Herbicide-releasing behaviour of the synthesised CRF microbeads was then analysed under various experimental conditions, and weed control efficacy determined under glasshouse conditions. Results revealed that adsorption of 2,4-D onto both organo-montmorillonites follows the pseudo-second-order kinetics model and is predominately controlled by the chemisorption process. However, multi-step mechanisms were detected in the adsorption on both organoclays, hence intra-particle diffusion is not the sole rate-limiting step for the adsorption process. Both organoclays followed the Elovich model, suggesting they have energetically heterogeneous surfaces. Herbicide-releasing behaviours of synthesised beads were investigated at various pH temperatures and ionic strengths under laboratory and glasshouse conditions. Furthermore, weed control efficacy of synthesised beads were investigated using pot studies under glasshouse condition. Desorption studies revealed that both synthesised microbeads have slow releasing behaviour at a wide range of pHs (5–9), temperatures (25–45 °C), and ionic strengths. The results also revealed that synthesised microbeads have excellent weed control efficacy on different broad-leaf weed species under glasshouse conditions. |
| first_indexed | 2024-03-07T15:00:42Z |
| format | Article |
| id | doaj.art-b1386537bc0b4252a58a9f3d3379ab50 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-07T15:00:42Z |
| publishDate | 2024-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-b1386537bc0b4252a58a9f3d3379ab502024-03-05T19:10:23ZengNature PortfolioScientific Reports2045-23222024-02-0114111010.1038/s41598-024-53820-8Controlled release herbicide formulation for effective weed control efficacySantosh Kumar Paul0Yunfei Xi1Peter Sanderson2Ravi Naidu3Global Centre for Environmental Remediation (GCER), The University of NewcastleCentral Analytical Research Facility (CARF) & School of Chemistry and Physics - Faculty of Science, Queensland University of TechnologyGlobal Centre for Environmental Remediation (GCER), The University of NewcastleGlobal Centre for Environmental Remediation (GCER), The University of NewcastleAbstract Controlled release formulation (CRF) of herbicide is an effective weed management technique with less eco-toxicity than other available commercial formulations. To maximise the effectiveness of CRFs however, it is crucial to understand the herbicide-releasing behaviour at play, which predominately depends on the interaction mechanisms between active ingredients and carrier materials during adsorption. In this study, we investigated and modelled the adsorption characteristics of model herbicide 2,4-D onto two organo-montmorillonites (octadecylamine- and aminopropyltriethoxysilane-modified) to synthesise polymer-based CRFs. Herbicide-releasing behaviour of the synthesised CRF microbeads was then analysed under various experimental conditions, and weed control efficacy determined under glasshouse conditions. Results revealed that adsorption of 2,4-D onto both organo-montmorillonites follows the pseudo-second-order kinetics model and is predominately controlled by the chemisorption process. However, multi-step mechanisms were detected in the adsorption on both organoclays, hence intra-particle diffusion is not the sole rate-limiting step for the adsorption process. Both organoclays followed the Elovich model, suggesting they have energetically heterogeneous surfaces. Herbicide-releasing behaviours of synthesised beads were investigated at various pH temperatures and ionic strengths under laboratory and glasshouse conditions. Furthermore, weed control efficacy of synthesised beads were investigated using pot studies under glasshouse condition. Desorption studies revealed that both synthesised microbeads have slow releasing behaviour at a wide range of pHs (5–9), temperatures (25–45 °C), and ionic strengths. The results also revealed that synthesised microbeads have excellent weed control efficacy on different broad-leaf weed species under glasshouse conditions.https://doi.org/10.1038/s41598-024-53820-8HerbicideKineticsThermodynamicsCRFsWeeds |
| spellingShingle | Santosh Kumar Paul Yunfei Xi Peter Sanderson Ravi Naidu Controlled release herbicide formulation for effective weed control efficacy Scientific Reports Herbicide Kinetics Thermodynamics CRFs Weeds |
| title | Controlled release herbicide formulation for effective weed control efficacy |
| title_full | Controlled release herbicide formulation for effective weed control efficacy |
| title_fullStr | Controlled release herbicide formulation for effective weed control efficacy |
| title_full_unstemmed | Controlled release herbicide formulation for effective weed control efficacy |
| title_short | Controlled release herbicide formulation for effective weed control efficacy |
| title_sort | controlled release herbicide formulation for effective weed control efficacy |
| topic | Herbicide Kinetics Thermodynamics CRFs Weeds |
| url | https://doi.org/10.1038/s41598-024-53820-8 |
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