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Ester Definition: An ester is an organic compound where the hydrogen in the compound's carboxyl group is replaced with a hydrocarbon group. Examples: Ethyl acetate is an ester. The hydrogen on the carboxyl group of acetic acid is replaced with an ethyl group. Article. Chemistry.
Recently, the term organic has come to imply products used in organic farming. Under this definition, an organic herbicide is one that can be used in a farming enterprise that has been classified as organic. Commercially sold organic herbicides are expensive and may not be affordable for commercial farming. Linuron is a nonselective herbicide used in the control of grasses and broadleaf weeds. 2  It works by inhibiting photosynthesis. 3  MCPA (2-methyl-4-chlorophenoxyacetic acid) is a phenoxy herbicide selective for broadleaf plants and widely used in cereals and pasture.