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Over the last 10-15 years 'Ceres Tonic' plantain (Plantago lanceolata) has been added to many ryegrass/ white clover pastures in Northland. From 2001 to 2009, measurements were undertaken monthly in six locations throughout Northland to record the dry matter contribution of 'Tonic' plantain in mixes relative to perennial ryegrass-based pasture, using pasture cages in paired paddocks.
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Moorhead et al. (2009) studied this question.
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