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A calibration block dimensioned and adapted to set a consistent, repeatable furrow depth for planter units. The calibration block provides a deck with a slot for receiving a first plate for supporting a distal end of the planter unit when setting its gauge wheels, whereby the first plate is flush with the deck at a predefine distance from the soil. The calibration block also provides a gauge block and associated second plate for increasing the predefined distance, if the user so desires.