Agriculture Reference
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Figure 7.3 Weed seed density (a) and seedling density (b) in maize grown in
rotation with winter wheat or in continuous monoculture,with or without
herbicides,in an experiment conducted in the Tiber Valley,Italy.(Adapted from
Covarelli & Tei,1988.)
species composition can occur in response to variations in crop diversity per se ,
regardless of herbicide diversity. Covarelli & Tei (1988) compared weed com-
plexes after six years of continuous maize or three cycles of a two-year winter
wheat-maize rotation; the experiment included treatments in which both
cropping systems were not sprayed with herbicides. Total weed seed density
was 66% lower (Figure 7.3a) and seedling density 62% lower (Figure 7.3b) for
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