19 Phase IV room at Pilzhof. The spacious tray fi lling line at Hajduk.
White button production at Hajduk.
Dohme in Tietzow Germany Dohme Tietzow is part of the Dohme group. Dohme has several sites in Germany. A new phase 1 facility was built in Tietzow in 2012. At this site horse manure is used for the majority of the year. Phase II/III is used in the traditional way according to a schedule that fills the phase II tunnels on Tuesdays and Wednesdays. Spaw- ning takes place the Monday afterwards. Fifteen days later on Tuesdays up to 21 days later on Mondays, the full grown compost is taken out of the tunnel. Most of the compost is filled into trays. The filling line has seen many modifications over the years and is currently ope- rating satisfactorily. The trays are steamed on the farm before they are emptied and steamed again when they arrive back at the phase IV farm. After this treatment they are driven to the tray filling line and filled with 90 kg/m2. The casing soil used here also comes from the Netherlands. The cacing material has been incubated for at least 20 days and is mixed through the casing soil at the moment it transported to the filling line. After filling, the trays are placed in a phase IV growing room. Contrary to at Pilzhof, the trays are placed widthwise in the room. The trays have the same dimensions as the ones used at Pilzhof, so this creates a “bed width” of 2.40 m. The trays are stacked nine high. For a uniform pattern of air movement, five metal air ducts – two on each side and one in the middle - have been installed in the growing room. The main difference is how the return air system works. At the moment that air is blown through the ducts at the sides of the room, the duct in the centre sucks in the return air. At times of high acti- vity this method can be reversed so that the duct in the centre ejects the air and the ducts at the side suck it in. The trays are watered from two sides. After a maximum of 13 days, a forklift takes the trays to the production
Side of a phase IV room at Hajduk with two metal ducts.
farm, which is about 250 metres away. It would be bet- ter however to transport the trays in a closed vehicle to protect them from the influence of the outdoor climate. When the trays are in the growing room at the produc- tion farm, the floor of the growing room is soaked with water and left to allow the CO2 and RH in the room to rise naturally before the climate unit is activated. Two flushes are harvested. The farm has a total of 27 gro- wing rooms, and 10 to 11 growing rooms are filled per week. Production reaches around 27 kg/m2, of which 90% is destined for the fresh market.
Hajduk, Sława, Poland On the companies run by Hajduk the machines are de- veloped and constructed in-house as much as possible in line with their philosophy of “keep it simple, stupid”. Another notable detail is that they mix the chicken manure in water before dosing it over the straw to achieve a better and more consistent blend. In phase IV the difference in the trays is immediately noticeable. The trays have the same dimensions as on the other farms, but they weigh 74 kg each instead of 120 kg. This makes the trays cheaper to buy. Over the years, the design of the trays has been improved and the weak design of the legs has now been reinforced to prevent buckling. The tray filling line is spacious, with
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Air movement at Pilzhof.
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