20
PHASE IV
m2. Hygiene is an important item. It explains why a third flush is not always harvested – if diseases are discovered in one of the earlier flushes, the growing room is steamed and emptied earlier than intended. In the past there were a lot of problems with pests and diseases. However, since steaming the compost at the production farm before removing the trays and stea- ming just before filling the trays has been introduced, the problems have been drastically reduced.
Advantages: • Large rooms used up to the 1st flush have a relatively low investment per m2/ growing area
• Smaller rooms for harvesting, clear to oversee for picking management
• Lower pressure of pest and diseases as preparatory stages are separate to production, lower risk of infec- tion.
• Rapid expansion possibilities - provided you already have a tray system.
• Climate system on production site requires less (coo- ling) capacity.
• Less expertise of growing needed on production site.
Explanation by Gerard van de Wijdeven (middel, with blue sweater) at Dohme.
a clear view of what is going on. Approximately 85 kg/ m2 of compost is filled. The cacing material is mixed through the casing soil from the compost . At Hajduk, the trays are steamed before they are filled. After leaving the filling line, the trays travel to the phase IV farm some 200 metres away. The air system used here is identical to the one at Dohme. The air is mainly blown into the room via the four ducts along the sides, and the return air is extracted through the duct above the central aisle. Except during periods of high compost activity, this system also alternates so that air is blown into the room from the central duct. Within the space of two weeks, the trays are transported in closed trailers to one of the production farms which are all located within about 25-30 kilometres from the phase IV plant. These farms work according to a schedule with three flushes, and achieve yields of approximately 32 kilo/
Disadvantages: • Less flexibility on production site, steering of the number of pinheads done at phase IV site
• One mistake in steering the number of pinheads during phase IV in large growing rooms has greater consequences than a mistake in small, conventional growing rooms.
• Mushrooms transported in trays are highly sensi- tive to the climate. Sun and wind influences during unloading at the production site can adversely affect quality.
• Information transfer, grower on production farm doesn’t know whether the compost in the growing room was active or inactive during mycelium growth. Providing good information about cultivation can help prevent this.
• High transport costs. ◗
Identical airmovement at Dohme and Hajduk.
Mixing chicken manure and water at Hajduk.
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