<?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">humus</topic></authority><related type="broader"><topic>soil by composition or origin</topic></related> <note xml:lang="en"><![CDATA[ Dark brown or black non-living organic substance derived from microbial decomposition of plant and animal substances on the surface of the earth. Living plants derive nutrients from the forms created by this decomposition. ]]></note></mads>