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B. madritensis also respired significantly less in monoculture than in mixed culture, but the difference was apparent immediately after labelling.
Comparisons between individual P. lanceolata or B. napus plants in monoculture and interspecific competition were made.
Populations fluctuated with the extent of monoculture , choice of cultivars, and extent of parasites.
Soil degradation due to sugar-cane monoculture and pesticides are the most serious problems.
When the native species is suppressed, the area becomes a monoculture of purple loosestrife.
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