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1. A sowing device for discharging and treating plant propagation materials after discharging while falling onto an underlying agricultural surface, the device having a reservoir container (10) for the plant propagation materials, having a separating device (20) which is configured to separate plant propagation materials (K) fed from the reservoir container (10) and to output them individually, and having an application device (30) to apply a dressing composition comprising a substrate bearing at least one agricultural compound onto the separated plant propagation materials (K) from a cartridge assembly comprising one or more cartridges that each are separate from the reservoir container (10) in the sowing device, wherein the application device (30) is configured to apply the dressing composition from the one or more cartridges to the separated plant propagation materials (K) after they leave the separating device (20) while the separated plant propagation materials (K) fall freely on toward the underlying agricultural surface (B) wherein the device and the one or more cartridges are configured to allow repeated removal from the device, and optionally, refilling with the dressing composition and replacing in the device, with minimal operator interaction, wherein the device further comprises a transmitter configured to transmit at least seed data and at least one additional data to a remote computer for data analysis, wherein the transmitter is configured to transmit an order request to the remote computer for the remote computer to prepare and procure another cartridge with suitable agricultural compounds to selectively compose a seed treatment, wherein the at least seed data and at least one additional data comprise information of a proportion of plant propagation materials that have been correctly provided with seed dressing composition, and geolocation data and/or environmental data.
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