The compact seeding drum line HT800 made by Atlantic Man. allows to sow plastic, polystyrene and thermoformed trays and crates for seedlings of any size used in greenhouses and nurseries. Thanks to a seeding capacity that can reach 800 containers per hour, this seeding line is able to meet medium-high production needs. The compact seeding drum line HT800 consists of a single compact module that allows to fill empty trays through the peat loader and submit them first to the drilling and sowing drum, then to the distribution of vermiculite and, finally, to the watering system consisting of perforated bars equipped with solenoid valve that allows to provide only the amount of water needed. The sowing takes place through a sowing drum with brass insert bars equipped with micro-holes through which the seed is suctioned: the advantage of the patented insert bar system is that it is not necessary to replace the entire drum when converting production, but it is enough to replace the already installed brass bars with others with different drilling holes, depending on the size and shape of the seed you want to process, thus saving on the costs of the equipment supplied with the machine. It is also possible to add at the beginning of the line an automatic destacker of empty trays and at the end of the same a storage belt for stacked trays, and replacing the drum dedicated to the distribution of vermiculite with a covering dispenser conveyor belt suitable for sand and peat.