AGR 3102 Principles of Weed Science Herbicide. Muhammad Saiful Ahmad Hamdani. Unit 6 – Topics Covered. Herbicides: Classification cont… Formulation. Herbicides Classification cont…. F. Chemical Structure Common method of grouping herbicides: herbicide chemistry and MOA
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Muhammad Saiful Ahmad Hamdani
F. Chemical Structure
- Copper sulphate, ammonium sulphate,
ammonium sulphamate, ammonium nitrate &
- Act as desiccant/desiccating agent
- Highly persistent in soil & highly toxic to other
- Widely used in 1900s for aquatic and woody
terrestrial plants, many no longer applicable as
& other PGR commercialization
(1) the solubility of the active ingredient in water
(2) the manner in which the product is applied (i.e.
dispersed in water or applied in the dry form).
A concentrated liquid (a.i., petroleum solvents, emulsifier), oil and water soluble.
A liquid formulation (a.i., water, sometimes a surfactant), water soluble.
A liquid formulation (a.i. dissolved in oil or some other organic solvent. Must be applied in an oil-based carrier such as diesel fuel or kerosene.
A thick slurry-like liquid (a.i., water, and stabilizers), water soluble. Spray tank agitation is necessary to avoid settling.
A dry powder (a.i., a diluent, and surfactants), water soluble. Spray tank agitation is necessary to avoid settling.
A dry formulation that contains a high percent (>50%) a.i, water soluble. Need initial agitation to dissolve.
A dry formulation, water soluble. Easier to handle and measure than wettable powders. Spray tank agitation is necessary to avoid settling.
A dry formulation (a.i., coated or adhered to some type of inert granule). Applied just as they are purchased with no mixing. Special granular spreader is required.
A dry formulation - similar to granules only much larger. Pellets are applied directly to the target area by hand or with special spreaders.