Youtor
Herbicide Adjuvants Advantages Classification and Mode of Action
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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 Herbicides: A Major Pat... • Mechanism of Herbicidal Selectivity • Mechanism of Herbicidal Selectivity • Methods of Application of Herbicides • Methods of Application of Herbicides • Classification of Herbicides • Classification of Herbicides • Weed Control Efficiency, Weed Smother Efficiency and Weed Index: Concept and Numerical • Weed Control Efficiency, Weed Smother... • Factors Affecting Herbicide Efficacy • Factors Affecting Herbicide Efficacy • Fate of Herbicides in Soils: Decomposition and Transfer • Fate of Herbicides in Soils: Decompos... • Part 1: Persistence of Herbicides in Soils • Part 1: Persistence of Herbicides in ... • Part 2: Persistence of Herbicides in Soils: Crop management strategies to reduce it • Part 2: Persistence of Herbicides in ... • Difference in Safener, Antidote, Protectants and Adjuvants and Details of Safeners • Difference in Safener, Antidote, Prot...
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