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Indoor Phase I

Keep ICAR-DMR indoor composting technology distinct from outdoor stacks and other bunker protocols.

Practical explanation + detailed referenceSources & review ↓
Polythene compost bags topped with dark casing soil and emerging button-mushroom pinheads in a dim cropping room, Tamil Nadu (uploader is a TNAU student; Tamil caption 'mushroom cultivation method').
Real cultivation photograph. Read its source for location and context; it is not a universal operating specification.Rahumath nisha · CC BY-SA 4.0View full photograph ↗
On this pageChoose a section, or keep reading below

Read this in the full guide: Understand and document a compost batch →

Understand the topic

Start with the explanation.

Follow the validated technology protocol for the actual facility. Do not borrow timers or stage durations from a different system.

Part 01

Simple explanation

Indoor Phase I uses forced aeration and defined transfers to improve process control.

Conceptual compost heap cutaway showing straw structure and internal spaces.
AI teaching illustrationStructure and air

The heap has structure, depth and internal variation. One central reading does not describe every part of the material.

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

What is happening

Enclosure and forced aeration change heat retention, moisture loss, gas movement and microbial selection compared with an outdoor pile.

Part 03

Operator explanation

Follow the validated technology protocol for the actual facility. Do not borrow timers or stage durations from a different system.

Part 04

What to look for

Observation should describe stage, location, pattern and change history before interpretation.

  • Uniform wetting before fill
  • air distribution
  • temperature pattern
  • transfer mixing
  • odour and structure
Part 05

What to measure

Measurement must retain method, unit, location, timing, calibration and sample identity.

  • Batch timeline
  • multi-point temperature
  • fan state
  • pressure
  • water additions
  • transfer mass
Part 06

Equipment and process boundary

Equipment is useful only when its role in the biological process is explicit.

  • Preparation area
  • aerated bunkers
  • loader
  • floor cleaning
  • Phase II tunnel
Part 07

Variables that interact

Outdoor preparation, aerated Phase I, remixing or transfer and Phase II are linked but distinct operations.

Part 08

What can go wrong

A symptom may have several mechanisms. Verify the cause before changing the process.

  • Blind timer operation
  • wrong protocol
  • incomplete mixing at transfer
  • capacity mismatch between bunkers and tunnels
Part 09

What changes at commercial scale

Scaling changes geometry, repeatability, instrumentation, material flow and failure consequence.

  • Mechanization improves repeatability only when loading, air and records are controlled
  • Bottlenecks move between preparation, bunker, transfer and tunnel
Part 10

What the evidence can tell you

Mapped evidence: Technologies Developed by ICAR-DMR for Commercial Use; Farm Design for White Button Mushroom Cultivation. Foundational, current operational, research and engineering sources retain their different roles.

Illustration of an operator recording a compost probe reading beside material samples.
AI teaching illustrationRelease with evidence

The batch record brings measurements and observations together. The calendar alone cannot prove compost is ready for spawning.

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

Compost system · process stage

Indoor Phase I

Keep ICAR-DMR indoor composting technology distinct from outdoor stacks and other bunker protocols.

Crop context
Agaricus bisporus
Publication
Public editorial page
External review
Not yet recorded · needed from Button Mushroom compost technical reviewer
Evidence records
2
Straw and compost heaps under an open-sided composting shed at the PT Dieng Djaya button-mushroom farm, Wonosobo, Central Java (archival, 1979); dim frame. Downloaded as the 3840px Commons JPEG render; original is 4964x3340 image/tiff (99 MB).
Compost preparation yard: rice straw and compost heaps under an open shed (Indonesia). Photo: Steijlen, Fridus, CC BY 4.0. Source

Compost temperature from day 0 to spawning

Long-method heap 65 to 70 °C with turnings, then pasteurisation at 58 to 59 °C for 4 to 6 hours, conditioning at 45 to 52 °C, cooling to 25 to 30 °C for spawning. Source: ICAR-DMR manual 2011.

30°40°50°60°70°80°turnturnturnPhase I: outdoor heap, 65 to 70 °CPhase II: 58 °C, then 45 to 52 °Cspawn at 25 to 30 °Cday 0day 22
Phase I heapPhase II tunnelPasteurisation band
Picture → explanation → field task

Understand the working room

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

Generated conceptual cutaway of an insulated mushroom-room wall and closed door.
01

Keep the room envelope continuous

Walls and doors form one enclosure. Joints, penetrations and door use affect the room as well as insulation. This cutaway is not a material or fire-safety specification.

Try this on your farm

Ask a qualified designer to review the envelope, moisture protection, cleanability and local safety requirements together.

Generated illustration of mushroom racks with a central access aisle and a worker.
02

Leave room for people to work

People need access to every growing level. Adding shelf area changes handling, access and air distribution. An attractive room picture cannot establish safe rack dimensions.

Try this on your farm

Walk through loading, harvesting, cleaning and emergency access with the designer before fixing the rack arrangement.

Quick orientation

Follow the validated technology protocol for the actual facility. Do not borrow timers or stage durations from a different system.

01

Simple explanation

Indoor Phase I uses forced aeration and defined transfers to improve process control.

02

What is happening

Enclosure and forced aeration change heat retention, moisture loss, gas movement and microbial selection compared with an outdoor pile.

03

Operator explanation

Follow the validated technology protocol for the actual facility. Do not borrow timers or stage durations from a different system.

04

What to observe

Observation should describe stage, location, pattern and change history before interpretation.

  • Uniform wetting before fill
  • air distribution
  • temperature pattern
  • transfer mixing
  • odour and structure

05

What to measure

Measurement must retain method, unit, location, timing, calibration and sample identity.

  • Batch timeline
  • multi-point temperature
  • fan state
  • pressure
  • water additions
  • transfer mass

06

Equipment and process boundary

Equipment is useful only when its role in the biological process is explicit.

  • Preparation area
  • aerated bunkers
  • loader
  • floor cleaning
  • Phase II tunnel

07

Variables that interact

Outdoor preparation, aerated Phase I, remixing or transfer and Phase II are linked but distinct operations.

08

What can go wrong

A symptom may have several mechanisms. Verify the cause before changing the process.

  • Blind timer operation
  • wrong protocol
  • incomplete mixing at transfer
  • capacity mismatch between bunkers and tunnels

09

What changes at commercial scale

Scaling changes geometry, repeatability, instrumentation, material flow and failure consequence.

  • Mechanization improves repeatability only when loading, air and records are controlled
  • Bottlenecks move between preparation, bunker, transfer and tunnel

10

Evidence boundary

Mapped evidence: Technologies Developed by ICAR-DMR for Commercial Use; Farm Design for White Button Mushroom Cultivation. Foundational, current operational, research and engineering sources retain their different roles.

Progressive depth

Move from field observation to mechanism, engineering and evidence without losing the original question.

PracticalWhat the operator notices
  • Indoor Phase I uses forced aeration and defined transfers to improve process control.
  • Uniform wetting before fill
  • air distribution
  • temperature pattern
TechnicalHow process variables interact
  • Outdoor preparation, aerated Phase I, remixing or transfer and Phase II are linked but distinct operations.
  • Batch timeline
  • multi-point temperature
  • fan state
EngineeringHow the physical system serves the process
  • Preparation area
  • aerated bunkers
  • loader
  • Mechanization improves repeatability only when loading, air and records are controlled
  • Bottlenecks move between preparation, bunker, transfer and tunnel
ResearchWhich evidence records govern this page
  • COMPOST-SRC-DMR-TECHNOLOGIES
  • COMPOST-SRC-DMR-FARM-DESIGN

The numbers for this step, with their source.

Process 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.

Biological and process parameters

COMPOST.PHASE1.COMPOST_TEMPERATUREsource contextual

Phase I heap temperature

65 to 70 °C
Stage
Phase I
Measurement context
Core of the outdoor long-method heap
Conditions
The heap should reach 65 to 70 °C in the core (ICAR-DMR farmer folder); ICAR-DMR treats 80 °C as the upper safe core temperature; Probe depth, time since turning and weather change the reading
COMPOST.PHASE1.AMMONIAsource contextual

Ammonia at the end of Phase I

800 to 1,000 ppm
Stage
Phase I
Measurement context
Compost sample at the end of Phase I
Conditions
ICAR-DMR: 800 to 1,000 ppm ammonia after Phase I; Phase II must bring free ammonia below 10 ppm before spawning; Measurement method and pH change the reading

Engineering design metrics

COMPOST.AERATION.AIRFLOWpending technical verification

Required airflow

Project value pending verification
Component
Aeration system
Design context
Process stage and loaded compost resistance
Method
Project-specific engineering calculation required
COMPOST.FAN.DUTY_POINTpending technical verification

Operating duty point

Project value pending verification
Component
Fan or blower
Design context
Intersection of verified fan and system curves
Method
Project-specific engineering calculation required
Evidence, applicability and review2 mapped sources

Sources support mechanisms and architecture. Technical and engineering values publish only through their separate governed registries.

Tier Acurrent operational

Technologies Developed by ICAR-DMR for Commercial Use

Documents distinct Indian composting methods, including aerated indoor Phase I and ZEPT concepts.

Publisher
ICAR-Directorate of Mushroom Research
Accessed
2026-08-22
Open original source
Tier Afoundational

Farm Design for White Button Mushroom Cultivation

Indian farm workflow, compost-unit components, tunnel and controlled-farm engineering vocabulary.

Publisher
ICAR-Directorate of Mushroom Research
Accessed
2026-08-22
Open original source

Read the evidence

Sources & review.

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

  1. Technologies Developed by ICAR-DMR for Commercial Use ↗

    ICAR-Directorate of Mushroom Research · 2020

  2. Farm Design for White Button Mushroom Cultivation ↗

    ICAR-Directorate of Mushroom Research

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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