The two major classes or herbicides are inorganic and organic ones. Examples of inorganic ones, used prior to the development of organic herbicides, are copper sulphate, arsenic trioxide, ammonium sulphate, ammonium thiocyanate, ammonium sulphate, iron sulphate, sodium tetraborate, sodium chlorate etc., but many of them have been discontinued because of their persistence in soil. Some examples of organic herbicides are 2,4-D; 2-4, 5-T; 2,4-DB; and MCPA [2,4-dichlorophenoxyacetic acid]; [2,4,5-trichloro-phenoxyacetic acid]; [4-(2,4-dichloro-phenoxy) butyric acid]; and [4-chloro-2-methylphenoxy acetic acid].
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