What Is the External Nutrition Bag Method in Commercial Morel Farming?

The External Nutrition Bag (ENB) method is a commercial morel cultivation technique in which sealed bags of nutrition substrate are placed into the bed, so the Morchella mycelium feeds from a standardised package instead of depending entirely on how rich the compost happens to be. It was invented in Sichuan, China, in 2000 by the team behind the Sichuan Morel Research Institute, and it is now the basis of most mechanisation in the industry. In plain terms: standardise the food, and you can standardise everything downstream — filling, sterilising, inoculation and climate.

Morchella is unusually nutrition-sensitive. Too little food and primordia form poorly; too much and the bed can run hot or competitors take over before the crop does. The ENB method pulls that variable into a bag that can be weighed, sterilised and replaced batch by batch, which is exactly why it pairs so naturally with machinery. At the institute's demonstration bases in Anxian (~300 acres) and Luojiang (~1,200 acres), the nutrition bag is treated as the basic production unit of the whole farm.

• What goes into the bag. The nutrient substrate is blended to 60–65% moisture, and this is where most beginner batches drift off course. An industrial substrate mixer handling 4–12 m³ (800–3,000 kg per batch) with a 5–8 minute cycle keeps moisture and particle mix consistent from batch to batch, rather than relying on a shovel and a hose.

• Filling bags at farm scale. The 4th-generation ENB Automatic Nutrient Bagging Machine runs 30–50 bags per minute (1,800–3,000 bags per hour) at 300 g–1,000 g per bag, on 220V/50Hz/1.5 kW, weighing around 380 kg. In labour terms, one unit does the work of roughly 15–25 people — usually the largest cost item on a morel farm. For bigger projects, a fully automated batching and bagging line is rated at 15,000–100,000 bags per day with PLC control and typically cuts labour cost by more than 80%.

• Sterilising what you feed the bed. A nutrition bag is food for more than morel mycelium, so it is normally sterilised before use. High-pressure autoclaves run at 105 °C, 115 °C or 121 °C, with chambers up to 76 m³ that a forklift can drive into, and 304 or 316 stainless steel is available for wetter or more corrosive rooms.

• Matching bags to spawn and to climate. Spawn planning is simple with standard units: one spawn tube inoculates 667 m² (1 mu). After inoculation, the environment carries the rest. A 20FT or 40FT IoT smart cabin holds 4–28 °C (±0.5), 70–98% RH and CO2 between 400 and 2,000 ppm with remote monitoring, while outdoor beds usually run UV-stabilised shade netting at 75%, 85% or 90% (HDPE with 3% UV, 5–8 years of service).

Where ENB projects go wrong is rarely the equipment. It is usually timing and hygiene: bags sitting too long before sterilisation, moisture drifting outside the 60–65% window, or bags scheduled without checking when the mycelium will actually be ready to use them. Fixing the sequence is cheaper than fixing the crop.

Machinery from the Sichuan Morel Research Institute is ISO 9001:2015 certified and CE machinery-safety certified, and the institute exports equipment and training to more than 25 countries, including projects in France's Rhône-Alpes, Turkey's Isparta and Muğla, and Spain's Andalusia. Growers moving from a few hundred bags to a commercial operation can use the English-medium Online Morel Cultivation Masterclass (Class A $5,000 / Class B $10,000) and turnkey farm design from 1 to 50+ ha, alongside fresh and dried Morchella (moisture below 12%) and OEM canned gift boxes.

For technical questions on ENB machinery, spawn or climate cabins, contact [email protected] or +86 17738334931, or visit www.cn-localfoods.com.