Decide three things before the racks go in: how far a row runs before a cross corridor breaks it, where full harvest containers leave the row, and which direction empties travel back. Those three choices set your kilograms per picker-hour far more than the speed of any individual worker does. Aisle dimensions matter too, but they are a separate calculation — this page is about where the rows start, stop and open.
Where do harvest bottlenecks actually form?
| Bottleneck | What it looks like on the floor | Layout fix |
|---|---|---|
| Long unbroken rows | Picker walks half the row to hand over full containers | Cross corridor at the midpoint |
| No handover point | Full containers stand on the floor waiting | Defined loading zone at the row end |
| Two-way traffic in one lane | Machines meet head-on and one has to reverse | One-way loop for full and empty containers |
| Mixed rack heights between rooms | Equipment only fits some rooms | One shelving geometry across the whole farm |
| Dead corners with no airflow | Pests and condensation build up | Rack ends kept clear, traps placed at entries |
How long should a row be before you break it?
Long rows maximise growing area, and rows of up to 100 m are common. The cost shows up in walking distance: a picker standing in the middle of a 100 m row is 50 m from the exit at the moment their containers are full, and that walk repeats all shift.
A central cross corridor removes it. Pickers leave the row at the midpoint, and transport distances are cut roughly in half. You lose a modest slice of growing area and you buy back kilograms per hour — on most farms the trade is worth making, and it is worth calculating before the concrete is marked rather than after.
Disconnectable electric drives suit this kind of layout well, because a machine can be docked and released at more than one point along the room instead of only at the head.
Where should picked mushrooms leave the row?
Every row needs a defined handover point, not an improvised one. Set aside an area at the end of each row for short-term container storage, and place it so that a machine can offload without standing in the entry the next picker needs.
The wording matters here, because packing formats differ: whether you work in punnets, trays or larger harvest containers, the layout question is the same — how many steps between the bed and the place the container is set down, and does setting it down block anyone.
Why does one-way flow beat the shortest path?
Give full and empty containers different routes. Picked mushrooms move toward the cooling room along one path; empties and returning machines come back along another. It looks longer on a drawing and it is faster in practice, because nothing has to stop and reverse.
This also protects quality. A bottleneck is not only lost labour — mushrooms that sit in a warm room while someone waits for a lane to clear lose shelf life before they ever reach the cooler.
Do extra tiers create a bottleneck?
They can, if the lifting is slow. Six or seven levels raise density, but only pay off when the picker reaches the top tier as easily as the bottom one. A Newton picking lorry moves the platform vertically and horizontally under power, so height stops being the thing that sets the pace — provided the batteries are charged before the shift rather than during it.
Keep the geometry uniform as well. If every room uses the same aluminium shelving height and tier spacing, any machine can work in any room, and you can move equipment to wherever the flush is heaviest instead of leaving it stranded.
Can a bottleneck be biological?
Yes, and it is the one people miss. If a layout blocks airflow or leaves dead corners where nothing moves, pests accumulate there and the room becomes a source instead of a workspace. Insect light traps such as the GT-I-DEAL and GT-PR series belong at the entrances and ends of rows, where people and equipment cross the threshold, because that is when pests come in — not somewhere in a spare corner.
Related reading
- How wide should mushroom farm aisles be?
- Shelf width and tier count: yield versus ergonomics
- The most common shelf design mistakes
- All Knowledge articles
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