<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">herbicide</topic></authority><related type="narrower"><topic>weed killer</topic></related><related type="narrower"><topic>sodium arsenite</topic></related><related type="broader"><topic>biocide</topic></related><variant type="other"><topic>herbicides</topic></variant> <note xml:lang="en"><![CDATA[ Any chemical agent that is toxic to some or all plants, particularly those categorized as weeds. Historically a variety of substances have been used including salts, carbon disulfide, borax, pyridine, mercurials, and arsenic trioxide. After 1945 synthetic varieties emerged including: amitrole, picloram, 2,4-D, DDT, atrazine, glyphosate, diquat, and paraquat. Herbicides do not always decompose and have created environmental hazards. ]]></note></mads>