The present invention discloses a blade unit and an assemblage thereof to form an aerator 10 to be operated by a work vehicle. The aerator 10 is formed by a plurality of blade units 18 rotatable supported on a support shaft. The aerator 10 is powered by torque received from the work vehicle via a power-take-off shaft. Each of the blade unit 18 includes a hub, a pair of tines and a cutter blade associated with each tine. The hub of each blade unit 18 includes an engaging portion defined on either ends of the hub. During operation of the aerator 10, each of the blade units 18 are engaged with each other via the engaging portions and torque is transmitted from one blade unit 18 to the other. This helps in reducing the stress force on the support shaft and also enables in easy replacement of damaged blade units 18, thereby reducing the maintenance cost and the shut down time of the aerator 10.
