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Compost For Mushroom Calculator

Work out compost for mushroom instantly with clear inputs, formula shown and shareable results.

About Compost For Mushroom Calculator

Button mushroom beds are filled at about 30-40 kg of finished compost per square metre of tray. Composting loses 30-40% of the raw stack weight as carbon dioxide, ammonia and water, so raw materials must exceed finished compost by that margin.

Formulas

Compost requirement

Finished compost = beds x compost per bed; raw materials = finished / compost yield %

Formulation

Straw = compost x straw share; supplements = compost - straw

Worked example

With the default values below, Compost For Mushroom Calculator returns Finished Compost Required of 7,000.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Number Of Beds Or Traysminimum 1
200
Compost Per Bedminimum 0.1 kg
35 kg
Wheat Straw Share Of Compostaccepts 1–100 %
60 %
Compost Yield From Raw Materialsaccepts 10–100 %
65 %

Results

Finished Compost Required
7,000.00
Raw Materials To Stack
10,769.23
Wheat Straw Required
4,200.00
Supplements And Manure
2,800.00

Step by step

  1. 1Values used
  2. 2Compost requirement
  3. 3Formulation
  4. 4Finished Compost Required= 7,000.00
  5. 5Raw Materials To Stack= 10,769.23
  6. 6Wheat Straw Required= 4,200.00
  7. 7Supplements And Manure= 2,800.00

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

What goes into the supplement fraction?

Chicken manure or horse manure, wheat bran, urea or ammonium sulphate for nitrogen, and gypsum at 2-3% to keep structure open and prevent greasiness.

Is pasteurisation essential?

Yes. Phase II pasteurisation at 57-60 C for 6-8 hours followed by conditioning removes ammonia and kills nematodes, mites and competitor moulds. Skipping it usually loses the crop.

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