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Home  /  Mycopedia  /  What is Bulk Substrate?
03 February 2016

What is Bulk Substrate?

Written by Hannah Glückspilz
Mycopedia bulk substrate, coir, Compost, rye berry, worm castings 8 Comments
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Bulk Substrate is a mildly nutritious material of greater volume that is used for mass mushroom cultivation. Bulk substrates are pasteurized and then usually mixed with a pre-colonized spawn which is made with whole grains such as rye berries or wild bird seed. The spawn then inoculates the bulk substrate.

Examples

Common bulk substrates (all of which are sold at Sublicious Farms) are:

  • Manure (for example horse or cow manure)
  • Coconut coir, which is a natural fiber extracted from coconut husk and holds many times its weight in water but does not decompose for years. It is sold in compressed bricks in mushroom supply stores such as Sublicious Farms. Coconut coir is usually mixed with vermiculite and pasteurized before inoculated with spawn.
  • Straw makes a good substrate because it is both nutritious and easy to break down. Cereal straws such as wheat or rye are the best.
  • Worm Castings (Vermicompost) is the end-product of composting using worms. Decomposing vegetable or food waste and bedding materials are used to create a heterogeneous mixture. After the breakdown of organic matter by an earthworm, these castings contain many nutrients and have less contamination.
  • Compost is organic matter that has been decomposed. It is used as a fertilizer and soil amendment. Compost is an ideal medium for mycelial growth. Basic mushroom compost is made of wheat straw, horse manure and gypsum (calcium sulfate). There are a variety of optional ingredients that may be added.
  • Sublicious Farms Bulk Substrate has a specialized formula, which is a mixture of the different forms of bulk substrates such as manure, worm castings, straw and coconut coir. It is pasteurized to eliminate potential contaminants. This bulk substrate is the best choice for growing any dung loving mushroom, as it will colonize completely, leaving a healthy mushroom substrate with thick mycelium, and large fruiting bodies in the proper conditions.

Hannah Glückspilz

I'm a Biology and English teacher from Germany and have just moved to Florida. I lloooovvee Mushrooms and gardening and learning and teaching about everything related to these topics. For those of you who don’t speak German, let me explain my name. In Germany, someone is a Glückspilz (literal translation: “lucky mushroom”), who is the object of good fortune. I consider myself lucky in many ways, especially for finding my mushroom loving better half, Scott Lyons, who encouraged me to start writing this blog.

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