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Topics

MushroomFarming / technical parameter

Evaporation and the crop surface

Use crop, casing, air and water observations to reason about moisture movement.

Practical explanation + detailed referenceSources & review ↓
White button mushrooms on casing soil in long shelf beds inside a commercial cropping room near Eger, Hungary.
Real cultivation photograph. Read its source for location and context; it is not a universal operating specification.Andrew Bossi · CC BY-SA 2.5View full photograph ↗
On this pageChoose a section, or keep reading below

Read this in the full guide: Run a Button mushroom crop from receipt to room reset →

Understand the topic

Start with the explanation.

Evaporation is an outcome of interacting conditions, not a direct humidity setting. Surface state, air movement, temperature, water availability and crop development all matter.

Part 01

Why this matters

Evaporation is the bridge between watering decisions and climate operation.

Illustration of compost receipt and a probe measurement.
AI teaching illustrationReceive the right compost

The delivered compost stage determines the work still needed. Phase II and Phase III deliveries require different handovers.

Conceptual explanation—not a real farm photograph, diagnostic finding or construction specification.
Part 02

What to look for

Build a record before making a change.

  • Surface and subsurface moisture
  • Air movement
  • Temperature relationship
  • Crop stage and canopy
Part 03

How to make the next decision

Use the observation to narrow a decision, then verify the response.

  • Describe the desired surface response
  • Coordinate climate and water
  • Avoid drying by aggressive local air
  • Verify effects across racks
Part 04

What to check before moving on

This topic cannot be interpreted in isolation.

  • Casing properties
  • Applied water
  • Air moisture
  • Air movement
  • Crop heat
Part 05

On the farm

Start in the room with surface and subsurface moisture and air movement. Record location, stage and recent events before changing the process.

Part 06

The technical explanation

The technical model joins casing properties, applied water, air moisture. Any operating value must be attached to a registered parameter, measurement location and applicable condition.

Part 07

What the evidence can tell you

This page is grounded in: Physicochemical characterization of casing materials used in Button Mushroom cultivation; Farm Design for White Button Mushroom Cultivation. Source provenance does not remove the need to check stage, system, date and local applicability.

Illustration of careful Button mushroom harvesting into clean food-contact containers.
AI teaching illustrationHarvest and reset

Picking, grading, packing and room reset are connected tasks. A strong flush can still lose value through poor handling or delayed dispatch.

Conceptual explanation—not a real farm photograph, diagnostic finding or construction specification.

Go deeper

Technical reference, records and tools.

Detailed crop-stage information, parameters, diagrams and specialist tools are kept together below. This material retains its source conditions and review limits.

Open the complete technical reference

Button Mushroom · technical parameter

Evaporation and the crop surface

Agaricus bisporus

Use crop, casing, air and water observations to reason about moisture movement.

Publication
Public editorial page
External review
Not yet recorded · needed from Button Mushroom technical reviewer
Updated
2026-08-22
Evidence records
2
Long tiered metal racks packed with colonised oyster-mushroom fruiting bags inside a grow room, Bicol, Philippines.
Grow room with tiered racks of oyster-mushroom fruiting bags (Philippines). Photo: MarvinBikolano, CC BY-SA 4.0. Source

Room climate by crop stage

Source: ICAR-DMR manual

10°C15°C20°C25°C30°CSpawn run22-25°C85-95% RHCase run23-25°C90-95% RHPinning16-18°C85-90% RHCropping15-18°C80-85% RH
Temperature bandRelative humidity

Quick orientation

Evaporation is an outcome of interacting conditions, not a direct humidity setting. Surface state, air movement, temperature, water availability and crop development all matter.

01

System role

Evaporation is the bridge between watering decisions and climate operation.

02

What to observe

Build a record before making a change.

  • Surface and subsurface moisture
  • Air movement
  • Temperature relationship
  • Crop stage and canopy

03

Decision framework

Use the observation to narrow a decision, then verify the response.

  • Describe the desired surface response
  • Coordinate climate and water
  • Avoid drying by aggressive local air
  • Verify effects across racks

04

Dependencies and handoffs

This topic cannot be interpreted in isolation.

  • Casing properties
  • Applied water
  • Air moisture
  • Air movement
  • Crop heat

05

Practical layer

Start in the room with surface and subsurface moisture and air movement. Record location, stage and recent events before changing the process.

06

Technical layer

The technical model joins casing properties, applied water, air moisture. Any operating value must be attached to a registered parameter, measurement location and applicable condition.

07

Evidence boundary

This page is grounded in: Physicochemical characterization of casing materials used in Button Mushroom cultivation; Farm Design for White Button Mushroom Cultivation. Source provenance does not remove the need to check stage, system, date and local applicability.

Progressive depth

Go deeper without losing the field question.

PracticalWhat to notice in the room
  • Surface and subsurface moisture
  • Air movement
  • Temperature relationship
  • Crop stage and canopy
TechnicalHow the interacting system is interpreted
  • Casing properties
  • Applied water
  • Air moisture
  • Air movement
  • Crop heat
ResearchWhich evidence records govern this page
  • ICAR-MR-CASING-2025
  • ICAR-DMR-FARM-DESIGN

Technical registry

The numbers for this stage, with their source.

Values are published from ICAR-DMR guidance with the stage and measuring point they apply to. A parameter still marked pending has no published Indian value yet.

BUTTON.CLIMATE.RELATIVE_HUMIDITY

Relative humidity

80 to 95 % RH

About 95 percent during spawn run and case run, 80 to 85 percent during cropping.

Stage
Crop-wide
Measured at
Defined crop-zone position
Crop meaning
Air moisture state; it does not equal crop-surface wetness.
Applicable conditions
Air temperature; Sensor accuracy; Crop stage
published sourced
BUTTON.CLIMATE.AIR_VELOCITY

Crop-zone air velocity

0.15 m/s

ICAR-DMR specifies about 15 cm per second over the beds, with 6 air changes per hour in the first two flushes and 4 later.

Stage
Pinning and cropping
Measured at
Crop level at mapped rack positions
Crop meaning
Local evaporation and distribution over the beds, not ventilation quantity.
Applicable conditions
Rack geometry; Crop density; Instrument
published sourced
BUTTON.WATERING.APPLICATION

Water replaced after picking

1 L per kg picked

ICAR-DMR: replace about 1 litre of water per kilogram of mushrooms picked, applied as a fine spray and never so much that it pools on the casing.

Stage
Casing through cropping
Measured at
Calibrated application over the growing area
Crop meaning
Water put back onto the beds to replace what the harvested mushrooms carried away.
Applicable conditions
Stage; Casing material; Application method; Evaporation and drainage
published sourced
Evidence and review record2 mapped sources

Sources support the page architecture and conceptual guidance. Technical values remain governed separately in the Button registry.

Tier C · research

Physicochemical characterization of casing materials used in Button Mushroom cultivation

Casing function and material-characterization context. Trial findings remain bounded to the study design.

Accessed
2026-08-22
Publisher
Mushroom Research, ICAR
Open original source
Tier A · foundational

Farm Design for White Button Mushroom Cultivation

Room planning, workflow, environmental-control architecture and engineering vocabulary.

Accessed
2026-08-22
Publisher
ICAR mushroom research institute
Open original source

Read the evidence

Sources & review.

Editorial update: 2026-08-22. Independent technical review is not recorded for this entry.

  1. Physicochemical characterization of casing materials used in Button Mushroom cultivation ↗

    Mushroom Research, ICAR · 2025

  2. Farm Design for White Button Mushroom Cultivation ↗

    ICAR mushroom research institute · Foundational official bulletin. Engineering guidance must still be checked against current codes, equipment and project conditions.

Reading a source is not the same as applying its instructions to every farm. Confirm species, strain, crop stage, system, region and publication date. Old chemical recommendations are not current-use instructions.

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