Device for sealing the seed meter of a vertically folded planting unit

An agricultural planter comprising:

• a toolbar that can be pivoted from a horizontal planting position to a vertical transport position;
• a planting unit is mounted to the toolbar, the planting unit having a vertical planting configuration and a horizontal transport configuration, the planting unit is provided with a seed hopper for holding seed, a seed meter for controlling how fast seed is planted by the planter unit, the seed meter is provided with a seed reservoir, a discharge area and a seed meter disc, a furrow opening for opening and closing a seed trench for receiving the seed, and means for sealing the seed meter to prevent seeds from the seed reservoir from entering the seed discharge area when the toolbar is rotated, thereby rotating the planting unit from a vertical planting configuration into a horizontal transport configuration, the means for sealing the seed meter comprises a resilient and elastic sealing diaphragm positioned across from the seed meter disc and a means for expanding the diaphragm against the seed meter disc, so that the diaphragm contacts the seed meter disc thereby sealing the seed meter to prevent seeds from the seed reservoir from entering the seed discharge area.