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Controlled release herbicide formulation for effective weed control efficacy.

Santosh Kumar Paul1,2,3, Yunfei Xi4, Peter Sanderson1,2

  • 1Global Centre for Environmental Remediation (GCER), The University of Newcastle, ATC Building, Callaghan, NSW, 2308, Australia.

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|February 20, 2024
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Summary

This study developed controlled-release herbicide formulations using modified organo-montmorillonites. These formulations demonstrate effective weed control with slow herbicide release across various conditions.

Keywords:
CRFsHerbicideKineticsThermodynamicsWeeds

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Area of Science:

  • Materials Science
  • Environmental Science
  • Agricultural Science

Background:

  • Controlled-release formulations (CRFs) offer reduced eco-toxicity for effective weed management.
  • Understanding herbicide adsorption onto carrier materials is key to CRF performance.
  • Organo-montmorillonites are promising carriers for herbicide CRFs.

Purpose of the Study:

  • To investigate the adsorption characteristics of 2,4-D herbicide onto modified organo-montmorillonites.
  • To synthesize and analyze the herbicide-releasing behavior of polymer-based CRFs.
  • To evaluate the weed control efficacy of the synthesized CRFs.

Main Methods:

  • Adsorption kinetics and isotherm modeling of 2,4-D onto octadecylamine- and aminopropyltriethoxysilane-modified montmorillonites.
  • Synthesis of polymer-based CRF microbeads incorporating the modified organo-montmorillonites.
  • Analysis of herbicide release under varying pH, temperature, and ionic strength conditions.
  • Glasshouse studies to determine weed control efficacy.

Main Results:

  • 2,4-D adsorption followed pseudo-second-order kinetics and was dominated by chemisorption, with multi-step mechanisms observed.
  • Organoclays exhibited energetically heterogeneous surfaces, consistent with the Elovich model.
  • Synthesized microbeads showed slow herbicide release across a broad range of environmental conditions (pH 5-9, 25-45°C).
  • Excellent broad-leaf weed control efficacy was achieved under glasshouse conditions.

Conclusions:

  • Modified organo-montmorillonites are effective carriers for developing controlled-release herbicide formulations.
  • The synthesized CRFs exhibit desirable slow-release properties and potent weed control capabilities.
  • These findings support the development of eco-friendlier and efficient weed management strategies.