Variable Cost of Straw and Variable Rate of Spawn 15 kg bag of substrate yields 3.75 kg mushrooms Biological Efficiency 78% ‐ Yield Efficiency 25% Straw cost $ per ton $300 $200 $100 $50
Spawn cost based on $1.50 per kilogram 4% 5% 6% 7% 2.40 1.90 1.40 1.15
2.62 2.12 1.62 1.37
2.85 2.35 1.85 1.60
3.08 2.58 2.08 1.83
3.75 kg Mushrooms @ $3 per kg = $11.25 per bag