Herbicide Adjuvants: Advantages, Classification and Mode of Action

Please note that by mistake adhesive force in this lecture was used in place of cohesive force and cohesive in place of adhesive force.
Adhesion force: Attraction Between molecules of different type substance e.g. Water is attracted to other substances Cohesive force: Attraction Between molecules of same substance e.g. water is attracted to water
Herbicide Adjuvants: Advantages, Classification and Mode of Action
Adjuvants can be grouped into three general types
1. Activators:Modify particle size and viscosity of the herbicide spray, evaporation rate, etc. Examples-Surfactants, wetting agents and oils (Crop oils, Dormant oils, Crop oil concentrates, Vegetable oils, Vegetable oil concentrate, Modified vegetable oil, Modified vegetable oil concentrate and Methylated seed oils)
2. Spray modifiers : Affect the delivery and placement of the spray solution. Alter the physicochemical characteristics. Examples- Thickening agents (i.e., invert emulsions and polymers, anti drift agent), Stickers, Spreaders, Spreader-stickers, Foaming agents, Humectants and UV absorbents
3.Utility modifiers:Minimize handling and application problems. Maintain the integrity of the spray solution. Reduce foaming, increase solubility, modify pH, or reduce spray drift. Examples- Emulsifiers, dispersants, stabilizing agents, coupling agents, co-solvents, compatibility agents, buffering agents, antifoam agents, and ammonium fertilizers.
Video links
Metabolism of Herbicides: A major pathway of herbicidal selectivity • Metabolism of Herbicid...
Mechanism of Herbicidal Selectivity • Mechanism of Herbicida...
Methods of Application of Herbicides • Methods of Application...
Classification of Herbicides • Classification of Herb...
Weed Control Efficiency, Weed Smother Efficiency and Weed Index: Concept and Numerical • Weed Control Efficienc...
Factors Affecting Herbicide Efficacy • Factors Affecting Herb...
Fate of Herbicides in Soils: Decomposition and Transfer • Fate of Herbicides in ...
Part 1: Persistence of Herbicides in Soils • Part 1: Persistence of...
Part 2: Persistence of Herbicides in Soils: Crop management strategies to reduce it • Part 2: Persistence of...
Difference in Safener, Antidote, Protectants and Adjuvants and Details of Safeners • Difference in Safener,...