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Lesson 16 / 18 · Button Mushroom Grower

Post-Harvest

Button mushroom is mostly water and has no skin. What you earn is decided in the first two hours after picking.

  • By the end you can say why cooling speed beats packing material.
  • By the end you can describe a cooling chain from bed to buyer.
  • By the end you can say which shelf life figures exist and which do not.

Graded buttons in punnets in Tamil Nadu, ready for cooling.

  1. Pick into shadeShallow crates, no heaping.
  2. Grade and trimSort by size and veil, keep spotted caps apart.
  3. Pre coolBring the crop towards 4 to 5 C fast.
  4. PackUse the pack size your buyer sells.
  5. Move coldDo not let the crop warm again.

Read numerical examples with their source, method and crop context. They are not universal operating instructions. Historical prices are not current quotations.

Respiration at 10 °C compared with 0 °C3.5times fasterthe reason to pre cool at onceSource: ICAR-DMR post-harvest bulletin, 2008
Target mushroom temperature after cooling4-5°Cfrom a field heat of 15 to 18 CSource: ICAR-DMR post-harvest bulletin, 2008
Chilling before despatch4°C for 6 to 8 hoursafter grading and packingSource: ICAR-DMR manual, 2011
Holding without a cold chain12 hours ambient, 2 to 3 days in a fridgestorage lifeseasonal grower figuresSource: ICAR-DMR button folder
In pack humidity for best colour87-90%modified humidity packagingSource: ICAR-DMR manual, 2011
Illustration of careful Button mushroom harvesting into clean food-contact containers.
AI-generated teaching illustration · not field evidence
Connect the picture to the lesson

Harvest and reset

Notice
Picking, grading, packing and room reset are connected tasks.
Understand
A strong flush can still lose value through poor handling or delayed dispatch.
Try it
Separate grade weights, rejects and sales, then reset the room.
See where this fits in the full workflow →

01Why speed beats packing

A picked mushroom keeps breathing, and breathing burns the crop's own weight and quality. ICAR-DMR's post harvest bulletin estimates that mushrooms at 10 C respire about 3.5 times faster than at 0 C.

So the first job is not the box, it is the temperature. The bulletin asks that mushroom temperature be brought down to 4 to 5 C as quickly as possible, from a field heat of 15 to 18 C at picking.

A farm with no cold room can still pick into shade, keep crates shallow, and reach the buyer while the crop is cool.

02The cooling chain

The chain is short and each step has a published band. Pre cool first, then hold. DMR's manual grades, packs and chills at 4 C for 6 to 8 hours before despatch.

Ordinary refrigerators run at 4 to 7 C, chill storage may go to minus 1 to minus 4 C depending on how fresh the crop is, and freezing is done below minus 18 C.

What matters is that the crop never warms again. A crate chilled to 4 C and then left on a hot platform for an hour has lost the benefit.

03Packing and the air inside the pack

DMR records that Indian local markets use retail packs of 200 g or 400 g in thin polythene. For longer holding, the manual gives an optimum storage atmosphere of 2.5 to 5 per cent carbon dioxide with 5 to 10 per cent oxygen, and says that in pack humidity of 87 to 90 per cent gives the best colour.

Over wrapped punnets can hold a fresh appearance for about three days at 18 C.

Start simple: shallow crates, a clean liner, no heaping, and a pack size your buyer actually sells.

04Know what is not published

There is no published Indian figure for commercial cold chain shelf life of fresh button mushroom. The 2011 manual says only that it can be stored at 4 C for a few days without deterioration, and that fresh marketing is still preferable.

The Hindi farmer folder gives the small grower's version: about 12 hours at ambient temperature after picking, and 2 to 3 days in a household refrigerator.

So measure your own losses by route and by season and write them down. Your own record is the only shelf life figure that applies to your crop.

Time your own cold chain

  1. Note the clock time each crate leaves the room.
  2. Measure the temperature of a mushroom in the middle of the crate.
  3. Record how long it takes to reach the cooling point.
  4. Weigh one marked crate at despatch and again at the buyer.
  5. Repeat in a cool month and a warm month and compare.

Write in your farm diary: Crate number, time out of room, pulp temperature, time to cooling, weight lost.

Mistakes that cost a crop

  • Buying packing film before arranging any cooling, which fixes nothing.
  • Chilling the crop and then letting it stand warm on a platform waiting for transport.
  • Quoting a shelf life figure to a buyer that no Indian source publishes.

Check yourself

Three questions, instant answers

  1. Mushrooms at 10 C respire how much faster than at 0 C?

  2. What shelf life does DMR publish at 4 C?

  3. In pack humidity of 87 to 90 per cent is recommended to protect:

An editorial self-check, not a certificate. Answers are not stored, not even on this device.

Words used in this lesson

Field heat
The warmth the crop carries when picked, here 15 to 18 C.
Pre cooling
Pulling the crop's temperature down fast before transport.
Cold chain
Every step from bed to buyer kept cold.
Modified atmosphere
Changing the gases inside a pack to slow ageing.
References & further reading
Button mushroom cultivation and climate knowledge

Operating values require stage, strain, sensor and production-system context.

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The guide behind this lessonOpen the reference guide