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Cropping Button Mushroom

Manage developing mushrooms as a changing biological load across racks, flushes and harvest events.

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

What you need to know.

Cropping is the weeks of picking that follow the first pins. The crop comes in waves called flushes, and the room has to change as the load of growing mushrooms changes. This page covers how long cropping lasts, the settings ICAR-DMR holds through the flushes, the daily round in the room, crop signs that point back to the room, and what to do between flushes and at the end of the crop.

Teaching revised 2026-09-24. Source-linked editorial synthesis; this date does not imply independent technical review.

Part 01

A crop that comes in waves, and how long it lasts

Button mushrooms do not come steadily. A flush grows and is picked over a few days, the bed goes quiet while the mycelium recovers, and the next flush follows.

How you vented shapes the waves. The manual's severe airing gives a heavy pin set and a large first flush, with smaller flushes after it; soft airing gives smaller flushes suited to market demand. Strains differ too: the manual's strain table describes NCS-100 as peaking in the first flush and NCS-101 in the second.

ICAR-DMR documents give different lengths for the cropping period, because each describes a different kind of farm. The button folder picks almost every day for 8 to 10 weeks in seasonal rooms. The manual's strain table counts its figures over 6 to 8 weeks of cropping. For round-the-year units the manual describes cropping cut to about 4 weeks when 5 to 6 crops are taken a year, and a 60-day room cycle giving at least six crops a room each year. The NHB model report plans on strains that give their best production in 30 days of cropping after spawn run.

Use these ranges to plan labour and rooms, then let your own records set the calendar.

Sources: ICAR-Directorate of Mushroom Research: Mushroom Cultivation, Marketing and Consumption · ICAR-DMR button folder · NHB DPR model, 2018

A dense flush of white button mushrooms fruiting from a compost bag with casing-soil specks, photographed in Assam, India.
A dense flush of white button mushrooms fruiting together from a compost bag in Assam. After a flush like this is picked, the bed rests before the next wave. Photo: Medhi jyoti, CC BY 4.0. Source
Part 02

Room settings through the flushes

The manual holds its pinning settings through the whole crop, then eases the air supply after the second flush. The button folder's seasonal figure is in the notes.

Air temperature15 to 17 °CThe button folder holds 16 to 18 °C for the whole crop; the manual keeps cropping below 18 °C to deny false truffle.
Relative humidity85 %The manual's watering section gives 80 to 85 percent during cropping.
Carbon dioxide1000 to 1500 ppm
Air changes, first two flushes6 per hourFresh air 30 percent, recirculation 70 percent.
Air changes, later flushes4 per hourFresh air 20 percent, recirculation 80 percent; oxygen stays at about 16 percent.
Load from the crop, first two flushes10 g carbon dioxide per square metre per hourPlus about 10 W of heat per square metre of bed at 17 °C and 88 percent humidity.
Fresh air filters2 µm meshTo keep out disease and competitor mould spores.

Sources: ICAR-Directorate of Mushroom Research: Mushroom Cultivation, Marketing and Consumption · ICAR-DMR button folder

Part 03

The daily round in a cropping room

A fixed order each day protects the crop and the next room. These steps follow the manual, the button folder and the NHB model report.

  1. Start with the cleanest roomPick from the newest or cleanest crop first and move towards older crops, as the NHB report advises.
  2. Read bed and airNote both thermometers. The bed should stay 1 to 2 °C above the air.
  3. Pick what is readyTake mushrooms with a hard cap and a closed veil. The manual gives 4 to 5 cm across; the button folder picks at 3 to 4 cm. Twist between forefinger and thumb, and trim the soiled stem end with a sharp knife.
  4. Leave the bed cleanDo not drop stem cuttings on the bed or floor. Remove damaged pins and mushrooms, and fill the holes left by picking with fresh casing.
  5. Put the water backAfter picking, spray 1 litre of water for every kilogram harvested.
  6. Clean the roomThe manual recommends cleaning the beds and floor after each harvest.

Sources: ICAR-Directorate of Mushroom Research: Mushroom Cultivation, Marketing and Consumption · ICAR-DMR button folder · NHB DPR model, 2018

Farm workers carry wooden trays heaped with freshly picked button mushrooms through a bamboo-framed cropping shed at the PT Dieng Djaya farm, Wonosobo, Central Java (archival Kodachrome, 1979). Downloaded as the 3840px Commons JPEG render; original is 4980x3209 image/tiff (95 MB).
Farm workers carrying wooden trays heaped with freshly picked button mushrooms through a bamboo-framed cropping shed in Indonesia. Photo: Steijlen, Fridus, CC BY 4.0. Source
Part 04

Crop signs that point back to the room

The mushrooms record what the room did to them. These links come from the ICAR-DMR manual and the NHB model report. Use them to check the room, and ask for a diagnosis when a sign persists.

  • Light mushrooms, discoloured caps and drying beds: humidity has been too low.
  • Pinning stops and the casing turns hard and shuts out water: the room has run too warm for too long, and the mycelium has sealed the casing.
  • Scales on the caps: fast air combined with low humidity, or strong vapours of formaldehyde or pest-control products.
  • Stems that turn deep purple within hours of picking, mostly from the third flush onwards: linked to how often and how much water is applied before harvest.
  • A hollow core in trimmed stems, sometimes brown: related to watering and water stress.
  • Pinkish gills growing in lumps on the cap, called rose comb: fumes from kerosene, petrol, diesel, paint or other oil products.

Sources: ICAR-Directorate of Mushroom Research: Mushroom Cultivation, Marketing and Consumption · NHB DPR model, 2018

Part 05

Between flushes, and when the crop is finished

The quiet days between flushes and the last day of the crop both call for decisions. Each rule below comes from the manual or the NHB report.

IfThe second flush is finished.
ThenCut fresh air from 30 to 20 percent and air changes from 6 to 4 an hour. The crop now gives off less carbon dioxide.
IfThe room drifts above 18 °C.
ThenBring it down. The manual keeps cropping below 18 °C against false truffle, and warns that long high temperature seals the casing.
IfYou run several rooms round the year.
ThenStagger them. The manual's example fills one room every 5 days, with at least 12 rooms on a 60-day cycle, for a steady supply.
IfThe crop is finished.
ThenCook out before emptying. The manual holds the compost at 70 °C for 12 hours to kill mycelium and pathogen spores; the NHB report's pest section gives 70 °C for 2 to 3 hours. Record which you follow.
IfThe spent compost is out of the room.
ThenDo not dump it in a moist, shady place where pests breed. The NHB report puts it in a compost pit covered with at least 10 cm of manure.

Sources: ICAR-Directorate of Mushroom Research: Mushroom Cultivation, Marketing and Consumption · NHB DPR model, 2018

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 · cultivation stage

Cropping Button Mushroom

Agaricus bisporus

Manage developing mushrooms as a changing biological load across racks, flushes and harvest events.

Publication
Public editorial page
External review
Not yet recorded · needed from Button Mushroom technical reviewer
Updated
2026-08-22
Evidence records
2
A dense flush of white button mushrooms fruiting from a compost bag with casing-soil specks, photographed in Assam, India.
Button mushroom flush on a compost bag with casing soil. Photo: Medhi jyoti, CC BY 4.0. Source

Room climate by crop stage

Button mushroom, room air temperature. Case run spans 23 ± 1 °C (climate section) and 24 ± 1 °C (casing section). Source: ICAR-DMR manual 2011.

10°C15°C20°C25°C30°CSpawn run22-24°C95% RHCase run22-25°C95% RHPinning15-17°C85% RHCropping15-17°C80-85% RH
Temperature bandRelative humidity
Picture → explanation → field task

A crop-room round

AI-generated educational illustrations. Not actual farm photographs, diagnostic evidence or construction specifications.

Generated illustration of an operator inserting a temperature probe into a compost bed.
01

Measure the bed, not only the air

The probe measures growing material at a specific location. Room air and biologically active compost can have different temperatures. One reading is not a whole-room survey.

Try this on your farm

Use a consistent measurement location and method. Record time, crop stage and bed position with the value.

Generated illustration of gentle water application to a bare casing surface before mushrooms emerge.
02

Assess casing before watering

This scene shows casing without developing fruit bodies. Water needs depend on stage and material condition. The picture does not specify a quantity or a universal watering schedule.

Try this on your farm

Check the approved crop protocol and the actual casing condition before deciding how much to apply. Record the application.

Generated illustration of a grower recording different pin densities along mushroom beds.
03

Compare the pinning pattern

The bed does not develop uniformly at every position. Differences can involve inputs, water or room conditions. A patch is an observation, not a diagnosis.

Try this on your farm

Compare fixed locations over successive rounds. Photograph the same patch and record nearby readings before changing settings.

Generated illustration of an empty growing room with racks, dedicated cleaning tools and a hose.
04

Prepare for the next crop

The crop is removed before the room is prepared for reuse. An empty room provides access to surfaces hidden by a loaded crop. Clean appearance alone does not verify disinfection.

Try this on your farm

Follow the farm's validated cleaning and end-of-crop procedure, document completion and resolve defects before refilling.

Stage13

Crop-stage dashboard

Cropping

Biological state
Fruit bodies expand and room load changes through harvest
Operator objective
Maintain quality and uniformity while the crop changes
Handoff
Coordinate harvest and flush recovery
ObserveMorphologydistributionsurface conditionroom response
Depends onPinningclimate capacitylabour

Quick orientation

The cropping room changes as biomass develops and is removed. Climate, water, carbon dioxide, labour and hygiene decisions should respond to crop stage and distribution rather than a fixed calendar alone.

01

System role

Cropping integrates crop observation, climate operation, watering, harvest and disease surveillance.

02

What to observe

Build a record before making a change.

  • Development by zone
  • Crop density and morphology
  • Surface and cap condition
  • Room response under load

03

Decision framework

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

  • Coordinate room operation and picking
  • Protect quality during water events
  • Separate symptom from diagnosis
  • Record performance by flush and zone

04

Dependencies and handoffs

This topic cannot be interpreted in isolation.

  • Pinning uniformity
  • Climate capacity
  • Water management
  • Harvest labour
  • Hygiene

05

Practical layer

Start in the room with development by zone and crop density and morphology. Record location, stage and recent events before changing the process.

06

Technical layer

The technical model joins pinning uniformity, climate capacity, water management. Any operating value must be attached to a registered parameter, measurement location and applicable condition.

07

Evidence boundary

This page is grounded in: Mushroom Cultivation, Marketing and Consumption; 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
  • Development by zone
  • Crop density and morphology
  • Surface and cap condition
  • Room response under load
TechnicalHow the interacting system is interpreted
  • Pinning uniformity
  • Climate capacity
  • Water management
  • Harvest labour
  • Hygiene
ResearchWhich evidence records govern this page
  • ICAR-DMR-CULTIVATION-MANUAL
  • 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.AIR_TEMPERATURE

Room air temperature

14 to 25 °C

Spawn run 22 to 24 °C, case run 23 to 25 °C, fruiting 15 to 17 °C in controlled rooms; the seasonal tables give 14 to 18 °C for fruiting.

Stage
Crop-wide
Measured at
Defined crop-zone position
Crop meaning
The control variable that interacts with compost temperature, evaporation and crop stage.
Applicable conditions
Stage; Strain; Sensor location; Room system
published sourced
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.CO2

Carbon dioxide concentration

800 to 15,000 ppm

10,000 to 15,000 ppm during spawn run with no fresh air; 800 to 1,000 ppm for pinning; 1,000 to 1,500 ppm during cropping with 20 to 30 percent fresh air.

Stage
Spawn run through cropping
Measured at
Representative room and rack positions
Crop meaning
A crop-activity and ventilation signal that needs stage context.
Applicable conditions
Stage; Crop load; Fresh-air strategy
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
Evidence and review record2 mapped sources

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

Tier A · foundational

Mushroom Cultivation, Marketing and Consumption

Broad cultivation, post-harvest and market context. Values are not promoted without page-level review.

Accessed
2026-08-22
Publisher
ICAR-Directorate of Mushroom Research
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. Mushroom Cultivation, Marketing and Consumption ↗

    ICAR-Directorate of Mushroom Research

  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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