FIELD: agricultural engineering. SUBSTANCE: dosing system has dosing casing arranged between tank and pneumatic distributing system. Replaceable dosing unit is positioned in dosing chamber and is equipped with dosing drive shaft and dosing wheels rigidly mounted for rotation on drive shaft. Dosing drive shaft may be connected with its one side directly or through connecting member to main drive shaft, when dosing unit is moved to operating position in dosing casing. Such construction allows seeding unit to be effectively matched with various seed materials. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 9 cl, 19 dwg
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