ABSTRACT
Granules and pellets are forms of herbicides in which the chemical is impregnated upon vermiculite, attaclay, or similar carriers. An emulsifier, spreader, sticker, or other surfacant is often added to facilitate dilution or increase wetting capacity. Frequently, formulations contain an inactive filler that serves as a diluent only. Water-soluble concentrates are readily dissolved in water to make a spray and are often sold as solids. Trichloroacetic acid, dalapon, sodium, salt of 2,4-dichlorophenoxy, and amitrole are examples. Emulsifiable concentrates are usually liquids in which the chemical is dissolved in one or more water-insoluble solvents, such as oil or benzene, and to which an emulsifier is added. Oil-soluble concentrates are similar to emulsifiable concentrates, but do not contain an emulsifier. Adjuvants are substances added to an herbicide or spray to improve its action. Wettable powders or water-dispersible powders are generally formulated from chemicals that are insoluble or soluble with difficulty in oil or water.
