Mushroom Cultivation Practices

Choosing Mushroom Type and Substrate

Selecting the right mushroom type is crucial as it dictates substrate and environmental needs. In India, popular choices include:

• Oyster Mushroom (Pleurotus spp.): Easiest to grow, adaptable to various substrates like paddy straw, wheat straw, sawdust, and cotton waste. Tolerates a wide temperature range (18-30°C).

• Paddy Straw Mushroom (Volvariella volvacea): Grows rapidly on paddy straw, banana leaves, or cotton waste. Prefers warmer temperatures (25-35°C).

• Button Mushroom (Agaricus bisporus): Requires more controlled conditions and a specialized composted substrate, usually wheat straw based. Prefers cooler temperatures (14-18°C for fruiting).

The substrate provides nutrients. It must be clean and free from contaminants. Common substrates like paddy or wheat straw need to be chopped into small pieces (2-5 cm) and soaked in water for several hours to increase moisture content.

Substrate Preparation and Spawning

After soaking, the substrate must be sterilized or pasteurized to eliminate competing microorganisms. For small-scale operations, hot water treatment is effective:

1. Soak chopped straw in clean water for 12-24 hours.

2. Drain excess water and load the straw into gunny bags or mesh bags.

3. Immerse the bags in boiling water (80-100°C) for 1-2 hours.

4. Remove bags, allow to cool to room temperature (around 25-30°C), and drain completely. The straw should be moist but not dripping.

Once cool, introduce the mushroom spawn (mycelium grown on grains). Break spawn into small pieces and mix thoroughly with the prepared substrate. For Oyster mushrooms, layer spawn and substrate in transparent plastic bags (e.g., 60x45 cm with small aeration holes). Use about 20-30 grams of spawn per kilogram of dry substrate.

Incubation and Fruiting Conditions

After spawning, bags move to an incubation room for the "spawn run," requiring specific conditions:

• Temperature: Maintain 20-28°C for Oyster, 25-35°C for Paddy Straw, and 22-25°C for Button spawn run.

• Humidity: Keep relative humidity high, 80-90%.

• Light: Complete darkness is preferred.

• Ventilation: Minimal fresh air exchange needed.

During incubation (15-30 days), white mycelium colonizes the substrate. Once fully colonized, bags are ready for fruiting. For Oyster mushrooms, make small slits in the bags or cut them open. For Button mushrooms, apply a casing layer (soil and peat mixture).

Mushroom Type Spawn Run Temp (°C) Fruiting Temp (°C) Relative Humidity (%) Oyster 20-28 18-25 85-90 Paddy Straw 28-35 25-32 80-85 Button 22-25 14-18 90-95

Harvesting and Best Practices

Once fruiting begins, pinheads appear and grow into mature mushrooms. This stage requires:

• Lower Temperature: Slightly lower than spawn run (see table).

• Higher Humidity: 85-95% by misting water.

• Fresh Air: Crucial for development; ensure good ventilation.

• Light: Indirect light is beneficial; avoid direct sunlight.

Harvest mushrooms when caps are fully open but before spore release. For Oyster mushrooms, gently twist and pull clusters. For Button mushrooms, twist them off the casing layer. Clean harvested mushrooms gently and store in a cool, dry place or refrigerate. Most types produce multiple "flushes" over several weeks.

Successful mushroom cultivation relies on strict hygiene, proper substrate preparation, and maintaining optimal environmental conditions. Following these practices helps farmers achieve good yields and tap into the growing market for fresh, nutritious mushrooms, enhancing income and food security.