So what are soy hulls and why are they so effective?

Oyster mushrooms are known to grow on just about anything… coffee grounds, sawdust, banana leaves, cotton seed hulls, and many other agricultural waste products… they all make reasonable substrates.

But some substrates are bound to produce faster growth and higher yields, and I gotta say that for Oysters, I have never seen something so effective in producing huge yields as the Master’s Mix.

Soy Hulls are just the exterior skin of Soy Beans, and are essentially a waste product of soybean farming.

For whatever reason, these soy hulls – when mixed with sawdust – have just the right nutritional composition for explosive fruiting, huge yields, and nice big fruits. It also seems to produce large and dense clusters, with endless folds of oyster mushrooms just clamoring all over each other to burst out of the bag.

You can play around with different ratios but most growers note that a 50-50 mix is ideal. Any more than 50% Soy Hulls, and your mix will be too nutritionally dense, and you will have a higher risk of contamination, or deformed mushrooms. Using less than 50% will diminish expected yield due to insufficient nutrition.




Mix the soy and hardwood sawdust thoroughly and pack into a large autoclavable mushroom grow bag. Fold over the top of the bag and pressure sterilize at 15PSI for 2.5 hours.

Read more about growing with soy hulls and masters mix here: https://learn.freshcap.com/growing/growing-mushrooms-on-soy-hulls-the-masters-mix/

Weight 8 kg
Dimensions 34 × 38 × 33 cm

10KG, 40KG, 1 Ton


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