Best substrate for oyster mushrooms

Is it necessary to mix different raw materials?

The substrate mixture largely depends on the method of heat treatment.

When steaming raw materials in water (this method is called hydrothermy or hot water pasteurization), it is not recommended to experiment with multicomponent mixtures.

Each type of vegetable raw material needs a different steaming time. If you are making mixtures, one type of raw material may pick up too much moisture, while another will not have enough time for high-quality heat treatment.

For this reason, the mycelium overgrows with problems.

If you process raw materials by xerothermy (treatment of dry raw materials with steam) or pasteurization in a tunnel, the use of mixtures is welcome.

In this case, in addition to increasing the nutritional value of the composition, its physical structure also improves - this contributes to normal gas exchange in the mushroom block.

The nutritional value of the substrate is determined by the presence of both the main mineral elements and microelements.

In most cases, mushroom growers monitor only the nitrogen content, which should be at least 0.7 - 0.9. Although the successful assimilation of nutrients by the mycelium is also associated with the presence of a certain amount of phosphorus, the ratio of C/N content, and the presence of many trace elements.

Mushroom substrate ingredients

In addition to plant components, lime solution or soda ash (sodium carbonate) is added to the substrate to increase the pH.

Is gypsum necessary in the substrate?

In some countries it is common to add gypsum. There it is believed that this may help regulate the humidity of the substrate.

In fact, plaster can absorb some water. But, in my opinion, it is easier to set up a method for disinfecting the substrate so that the substrate has optimal humidity, instead of using gypsum. After all, it is not needed for oyster mushrooms.

In addition, it is almost impossible to calculate how much it needs to be added to obtain the required humidity. The idea that gypsum will then be able to release water back into the substrate is a myth.

Try pouring water into plaster or alabaster and then taking the water away from them. 😉

Is it possible to recommend a specific recipe for a mixture of raw materials?

No, since even the same plant species that grows in different conditions can have different composition and C/N ratio.

Mixtures are made empirically. It is necessary to take into account the amount of nitrogen of each component and the hardness of the plant material.

For example, alfalfa straw is quite tough. It can be combined with soft barley straw. Hay is best used with wheat and rye straw.

The husk can be added to any composition, gradually increasing the percentage of its application and observing overgrowth and yield.

When I say "observing" I mean "recording the results of each batch of blocks."

What supplements are good for mushroom substrate?

Various additives are added to the substrate in order to improve productivity. Experienced technologists often mix different types of raw materials to improve gas exchange in the block, but I mentioned this above.

What you can add to the mushroom substrate depends on how the raw materials are processed. If you fill the substrate with hot water or disinfect the raw material with lime, any additives can cause mold spots to appear when the mycelium overgrows. You can try adding any legume hay, but not more than 10%.

However, I categorically do not recommend bran for such methods of processing raw materials.

Read about bran here

If you are growing mushrooms just as a hobby and making very little substrate, you can try pouring boiling water over a grain of wheat, barley, rice or millet and letting it sit until it cools. The container with grain should be well insulated; you can, for example, wrap it in a blanket so that the water cools slowly.

This cooled grain can be mixed with grain spawn and added to the substrate you are using. You determine the amount of grain yourself. Add 10% grain to one serving, 15% to another, and 20% to a third. And watch the yield.

Some hobbyists simply mix 5% mycelium with the grain and add nothing else.

However, these mushrooms will be too expensive, because grain is not cheap. In addition, such a substrate may deteriorate. If there are too many nutrients in it, the bacteria will occupy it before the mycelium.

Some articles suggest sawdust as a nutritional supplement. This is mistake! Sawdust and shavings contain very little nitrogen. Sawdust is used for substrates that are sterilized, but such mixtures are always supplemented with nutritional supplements that contain a lot of nitrogen. In such substrates, the balance of nutrients and physical properties is important.

When pasteurizing a substrate in a tunnel, the best additive is legume hay. It contains many nutrients and perfectly heats the raw materials in preparation for pasteurization.

Adding fertilizer to mushroom substrate

The hyphae of oyster mushroom mycelium cannot break down fertilizers to obtain nutrients from them. However, some mushroom growers claim that yields have increased significantly after adding fertilizers. I don't know what to say about this. There is a scientific fact, on the one hand, and the assurances of mushroom growers on the other hand.
When I ask these people how they conducted the experiment, whether they had a control batch of blocks without fertilizers, it turns out that they did not.
Some fertilizers, such as urea, can heat the substrate. This property is used in some countries before pasteurizing the substrate in a tunnel.

What is the use of urea in mushroom cultivation?

Some fertilizers, such as urea, can heat the substrate.

This property is used in some countries before pasteurizing the substrate in a tunnel.

I would like to draw your attention to the fact that urea does NOT increase the level of nitrogen in the substrate that oyster mushroom mycelium can use! It is used only to heat the substrate (due to the activity of microorganisms that feed on it)

I read recommendations to take 1 kilogram of urea per ton of wet substrate. I think that's a lot.

I had such a case. My clients had low yields, including due to uneven overgrowing of the substrate. When we eliminated other causes of this phenomenon, I suggested reducing the amount of urea.

Although they put only 0.5 kg per ton, and another of their consultants was against this decision. The raw materials were processed by tunnel pasteurization.

I suggested trying it once and reducing the amount of urea by half. With this reduced amount of urea, the substrate on the site warmed up to the same temperature.

Therefore, the owner decided to do all the following loads with a reduced amount of urea. At the same time, the substrate was overgrown without spots, and the yield of oyster mushrooms increased.


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