| http://www.w3.org/ns/prov#value | - This may have occurred due to corn competition with weeds for water, light, and nutrients (Carruthers et al., 1998), but also or mainly because weeds cause reductions in the corn root system and leaf area (Silva et al., 2009c) and may produce allelopathic substances that may be harmful to corn (Rajcan & Swanton, 2001).
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