White button mushroom on compost


  • fermented compost derived from horse dung, produced as described below
  • plastic bag or other water- tight container
  • casing soil (see below)


horse dung or manure as mushroom compost

1. Substrate selection:

Construct a pile of approximately 800 kg of horse dung and straw.

Add 1 kg chalk (CaCO3) per 100 kg of material.

Spray water till it leaks out from the stack.

horse dung or manure fermentation to mushroom compost

2. Compost preparation:

Turn the pile over after 6 days, than after 5, 4, 3, and 2 days consecutively.

During the process the compost should be moist, but not wet.

  • If water leaks out: add straw
  • If feeling dry: add water.
  • Under extreme climatic conditions: protect with a plastic sheet.

The ready compost should smell like fresh bread

use of horse dung or manure compost in agaric or white button mushroom production

3. Inoculation:

  • mix 1 portion of spawn (mycelium on rye) with each 15 kg of compost.
  • fill 30 cm thick layers into boxes or plastic bags
  • gently press the surface
  • cover with plastic against drying

incubation phase of white button mushroom

4. Incubation:

Place the substrates preferably at room temperature.

It takes 3 to 4 weeks at 15 to 25°C till the mushroom mycelium has fully overgrown the substrate

covering up the ready mushroom block with earth

5. Casing:

cover the incubated substratum with a 5 cm thick layer of casing soil, which is composed of:

  • half soil without parasites: e.g. drawn from a dept of at least 60 cm
  • half peat, mixed with 10 % ash or calcium carbonate.

When protected by plastic, mycelium filaments will appear on top of the casing soil after 1 more week of incubation.

fructification of Agaric mushroom hobby

6. Fructification:

Loosen the casing soil by means of a fork, place the substrate in a humid environment (light is not necessary), and keep the surface  moist by regular watering.

The mushrooms will appear as a series of growths (called "flushes") every 1 to 2 weeks. The substratum will be exhausted after 5 or 6 such flushes.