Year-long sub-daily N2O emissions data from 3 sites used to assess sampling strategy.
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Sampling in daytime between 09:00 and 12:00 best estimated daily mean N2O emissions.
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Weekly sampling + biweekly sampling for one week after >20 mm rainfall most efficient.
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Applying sampling recommendations will reduce errors in manual chamber measurements.
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Sampling schedules achieve greater accuracy in higher emission systems.
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