What Is the External Nutrition Bag Method for Commercial Morel Cultivation?
The External Nutrition Bag (ENB) method is a morel cultivation technique that feeds Morchella mycelium from sealed, sterilized bags of nutrients placed on the soil surface, instead of mixing compost directly into the soil. It was invented in Sichuan, China in 2000 and is now the backbone of most commercial morel farms worldwide because it raises and stabilizes yields while cutting contamination losses.
Before ENB, growers blended manure, grain or sawdust supplements through the whole bed. Morel mycelium is a comparatively slow colonizer, so those loose nutrients were also a free meal for moulds, bacteria and competitor fungi. The ENB approach separates food from soil: the mycelium grows through the casing layer and colonises the bag from the outside, while everything inside stays protected by sterilization. Growers can then add or remove bags at different crop stages to steer nutrition, which is why the method spread to projects in France's Rhône-Alpes, Turkey's Isparta and Muğla provinces, Spain's Andalusia, and more than 25 countries in total.
Sichuan is the birthplace of commercial artificial Morchella cultivation, and the Sichuan Morel Research Institute (founded 2010) runs the demonstration and manufacturing side of the system: about 300 acres at Anxian, roughly 1,200 acres at Luojiang, over 50 hectares of outdoor demo fields and a 12,000 m² equipment workshop. Their experience shows ENB is less about one clever bag and more about a repeatable four-stage process.
• Stage one is substrate preparation. An industrial substrate mixer in the 4–12 m³ range handles 800–3,000 kg per batch in a 5–8 minute cycle and brings moisture to 60–65%, the window where morel mycelium runs fastest without going anaerobic.
• Stage two is sterilization. A high-pressure mushroom autoclave at 105, 115 or 121 °C, available up to 76 m³ with forklift drive-in loading, clears the substrate and nutrition material of competitors; 304 or 316 stainless is an option for wetter, more acidic recipes.
• Stage three is bagging. The fourth-generation ENB automatic nutrient bagging machine fills 30–50 bags per minute (1,800–3,000 bags per hour) at 300 g–1,000 g per bag, runs on 220V/50Hz/1.5 kW, weighs about 380 kg and typically replaces 15–25 manual workers. Consistent bag weight matters, because uneven nutrition packs produce uneven fruiting.
• Stage four is field placement and climate. Morel spawn tubes are dosed at one tube per 667 m² (one mu). Outdoors, UV shade netting at 75/85/90% (HDPE with 3% UV stabiliser, 5–8 year service life) buffers temperature swings. Indoors, an edible mushroom IoT smart cabin in 20FT or 40FT format holds 4–28 °C (±0.5), 70–98% relative humidity and CO2 between 400 and 2,000 ppm, with remote monitoring so one grower can watch several rooms from a single phone.
For anyone scaling up, the practical bottlenecks are labour and consistency, not the biology. A 15,000–100,000 bags per day automated substrate batching and bagging line with PLC control removes more than 80% of the manual labour cost in the substrate room, and turnkey farm design covers sites from 1 to 50+ hectares. Growers who want the agronomy side can take the institute's online Morel Cultivation Masterclass (Class A $5,000, Class B $10,000, taught in English).
If you are planning a commercial morel operation, it helps to start from the nutrition strategy and work backwards to equipment. The Sichuan Morel Research Institute (ISO 9001:2015, CE machinery safety certified) advises on ENB layouts, spawn volumes and cabin sizing, and can be reached at [email protected] or +86 17738334931, with background at www.cn-localfoods.com.