More than half of the mushroom in Ukraine is grown on Phase 3 of compost – that is the result of a reduction in volumes.

According to information received by UMDIS agency from compost producers of Ukraine, demand for Phase 3 compost has decreased slightly compared to the same period last year.

At the same time, production of Phase 2 compost has more than halved due to reduced demand.

As a result of these changes, already in the summer of 2022, the volume of champignon mushrooms produced on Phase 3 compost will exceed the volume of champignon mushrooms grown on Phase 2 compost.

We will remind, as a result of Russian aggression, at the end of February-March, the majority of compost factories in Ukraine stopped soaking new batches of compost, and resumed this process only at the end of March, gradually increasing volumes.

In May 2022, the volume of compost orders in Ukraine reached approximately 60% of the pre-war level typical for this period.

However, the period of low prices for champignons in June and the whole summer negatively affected the optimism of mushroom growers, so today the production of compost in the country is about 50% of the level of the same period last year.

At the same time, the Grikar-APS compost plant in the Kharkiv region and the Agrotandem-Plus compost plant (Mriya SE) are not working.

Thus, 100% of compost for sale in Ukraine is now supplied to the market by 4 compost production companies: Agaris Miko Ukraine (Ternopil region), Agaris Miko Center (Cherkasy region), VG Farming (Veres, Cherkasy region), World of Straw (Mykolaiv region).

Phase 3 compost is offered by both Agaris and World of Straw plants.

We are happy to announce that Mertens Mushrooms from Holland has joined our mushroom community!

As a dedicated supplier, Mertens believes in good cooperation towards a healthy growth for every business. The company is well versed in professional agriculture, garden retail and landscaping, and passionately shares its expertise. From its roots in Limburg (The Netherlands), Mertens has developed into a down-to-earth, involved, and most of all reliable and knowledgeable partner.

Mertens has almost 70 years of experience, relies on a team of about 130 permanent employees, has its own vehicle fleet and over 7,000 products in stock. From this basis, Mertens has managed to acquire a leading position in the mushroom sector. When it comes to mushrooms, Mertens is even the world’s biggest player. Our team is active in 41 countries, spread over six continents.

Focus on prevention
Mertens offers a complete package of products for growers and tunnel companies: biocontrol, films, cultivation, compost and sliding mats, fogging equipment, scales and hygiene products. Mertens’ range clearly reflects the trends and developments within the sector, in which prevention is now paramount. Today crop protection products, mainly biological, are only used when absolutely necessary. An example of prevention within mushroom cultivation is the use of nematodes; this worm species plays an important role in the control of mosquitoes in cultivation. Mertens has guided growers intensively in the application of these nematodes. To be able to inform its customers in the best possible way, Mertens ensures that its own expertise is always kept up-to-date.

International growth
From its roots in Limburg (The Netherlands), Mertens’ mushroom branch has increasingly focused abroad. Mertens is now also active in the growing mushroom market China, often indirectly through other supplies or consultants. This is a logical development, knowing that the number of Dutch mushroom growers has decreased drastically in recent years. The extensive online communication possibilities facilitate remote contact. In addition, the Mertens website is a source of information and provides a sophisticated ordering system for both domestic and foreign customers. Among other things, mushroom growers can find order lists, safety sheets and product information here. Online sales have grown strongly in the last few years, but Mertens also attaches great value to personal contact.

Mertens is ready to help you!
Moving with the times, synergy with other sectors, cooperation, flexibility, adaptation to market needs… These are the characteristics that have brought Mertens to where it is today, and all this is combined with expert advice.
Meet our Mushroom Team! They will be happy to help you.

If a consultant is visiting a farm there are always many things to discuss in detail.

Shall we give more or less water and are we able to water over the mushrooms?

Do we need a slower or faster fructification?

Is the amount of pins sufficient or do we need more and how do we then get a decent stagger?

Even discussions about compost although many growers do not really know the details. But they know about structure, moisture and smell. Because this is what they discuss at filling.

The same about casing soil. Is it heavy this time or just fine? Wet or dry?

But talking about supplement one finds out that most of the growers have absolutely no idea how it works, what it really is and the choices they can make. Generally the price is the main buying point.

And this is strange to me. Because compost and casing are always changing during the year. This is mainly due to the seasonal effect on the raw materials. Straw is maturing in the storage, chicken manure will change in nitrogen level and peat is changing moisture depending on the season of the year. Manufacturing companies will react to that but smaller changes are inevitable.

To keep production at the same level or to enhance it, the supplement however can be changed to your liking. Most of the growers only know that there is a slow or normal release product. But it is possible to customise the supplement to the situation of that moment. Not just slow or fast but even pinpointed to a certain phase of the growing. To give an example: one of the farms I work on now wanted more activity in second flushes and a longer shelflife. In cooperation with the compost supplier and the supplement supplier they have now “composed” a supplement that can do that. Be aware though that it also needs adapting of the growing. You are putting more proteins into the compost so the activity changes too. This means that also the watering and the picking have to change.

But this way many combinations are possible.

There are different raw materials to mix and several processes to make the release time fitting your schedule.

A few remarks though have to be made.

It only works well in cooperation with the compost supplier. The ingredients of the supplement have to be an addition to the nutrients in the compost. So it has to fit the analyses of the compost.

The best way to use it if it can be mixed in at the compost yard. And this is only profitable with bigger quantities of compost. Mixing it in at filling is not as efficient as on the compost yard.

Do not just look at protein levels. Because some proteins are not available to the mushrooms and will still be in the compost at the moment of emptying the room.

So look at effective protein. This often is a matter of price. Good proteins come with a price.

And remember: good supplement makes good compost better. But good supplement makes bad compost worse.


From the production of healthy food to attention to animal and plant health, from managing a beautiful and diverse landscape to contributing to a healthy economy: Limburg's farmers and horticulturists literally keep the province healthy. Today a conversation with entrepreneur Gerard Sikes from Ysselsteyn, who is well on his way to climate-neutral mushroom production.
Sikes (49) grew up on an arable farm, his wife Karin (49) on a mushroom farm. In 1988 they started cultivating mushrooms together.
'A nursery was for sale, but we could also have bought a sandwich shop or opened a bicycle shop,' says Sikes. 'What matters to us is doing business together.'

Every morning, around eight o'clock, the couple sits together at the table to discuss all current matters and the day ahead. 'A healthy relationship is the basis for our company. My wife gives feedback, is my complaint and teacher.'

Source: Nieuw Oogst (article is in Dutch)


The last month several growers had problems with a too heavy casing soil. It is normal for this time of the year for casing soil to be heavier because of rainfall on the peat fields. It takes a few weeks for the casing companies to sort this out and in the mean time the grower has to deal with this. A normal situation for this period. Complaining is not the way to deal with this but inter acting is possible.

The first thing to do is to recognize that the casing ís heavy. This can only be observed if good attention is given to the filling of the room. Always talk to the truck driver about compost and casing and you already know a lot. They know exactly what material they carry. If they say it is a heavy load and if water is coming out the first thing to do is to adjust the filling machine. Heavy casing soil packs more so it has to be opened up. The caccing spinner on the combine filling machine plays a big role in this. It has to pick up the compost and mix it well into the casing. Cac a bit more than normal if casing soil is heavy. The next step is to make the mixing spinner turn a bit slower. Too intensive mixing will destroy the structure and cause big problems in outgrow of the pins later on. The pressing roll should be adjusted that way that it does not close the holes in the casing. If you look at the roller from the side of the shelf, a little bit of light should be visible between roller and casing.

Then be careful with water on the first day. Make sure the caccing material starts growing. This can be seen by the attachment of the compost to the casing. Do not wait however till you really see the mycelium. Because then the time for watering can be too short. And mycelium will overgrow the casing. The normal amount of water can be given minus a few litres. (the water on day one). It is a good thing if watering gifts can be split into small doses. 1 litre at a time with intervals of at least 1 hour. Only on the first watering day (probably day 2 after filling) bigger gifts are possible.

The next thing that might happen is that the mycelium has difficulties growing to the surface. Remember, a heavy casing soil needs help to release water and CO2 so always make sure that fresh air is given to the room. A minimum of 5% fresh air most of the times helps a lot. If the mycelium has reached the surface generally the fructification is normal. The only difference is from day 7 to day 10 of the fructification. From that day 7, the pins might stagger in outgrow. At that moment again fresh air is needed to keep the evaporation going. A minimum of 5% might not be enough anymore. If you see pins but they do not grow out you have a few possibilities.
A drop of water as a shock. This means 0,5 litre of water and mild drying with heating and fresh air. Fan can be set up to 5% higher in speed.

Or you can drop the CO2 to about 1000 ppm for a day. But make sure that RH stays over 88% in this case.Overall the growing later on will be on a bit lower CO2 than normal to keep evaporation going. Watering as normal. The biggest mistake made is to keep rooms like this too dry. Be aware that the room might develop less pins than normal. Let them grow out and pay special attention to the picking. This way these rooms do not have to be any worse. On the contrary, often they are better (in a financial way) than normal.

If one wants to start a discussion with a grower (or with a consultant), start talking about watering.
How much, when and what watering method.

To make any sense though, you first have to define the period. There is watering on casing soil and watering over mushrooms and between flushes.
This blog is about watering on the casing soil during the incubation period. The water given in that period is to bring the casing soil up to the maximum moisture level and to keep the compost at the right moisture.
A good phase 3 compost at the moment of casing will be around 60% in moisture. For white strains that can be up to 3% higher, brown strains prefer 1 or 2% drier. It is not possible to bring the compost to a much higher moisture level by watering it after filling. It is possible to give water into the compost but that will be free water which has to disappear during the fructification period.
2 up to 4 litres of water can be given into the compost at filling or later but that should be the maximum. Even if it is necessary to cool the compost. This can better be done by giving water into the casing and let it evaporate with fresh air and circulation.

Casing soil itself can handle up to 7 litres per m² plus the water that was originally in the casing. To be sure, we talk about a casing containing white and black peat.
More than 7 litres will evaporate, go into the compost or down the drain.
Considering that the evaporation can be around 2 litres per m² per day, the loss with evaporation is about 10 litres. If you count the loss of dripping, the water staying in the compost and the evaporation you come to a figure of about 25 litres of water. In practical situations this means a total amount of water between 20 and 30 litres average. Depending on the farm and the time of the year. Growing drier often means a loss of production and growing a lot wetter means problems in growing, mainly in the outgrow of mushrooms.
Another thing to watch for is the watering method. Make sure that the pressure of the water onto the casing is not too high. Too many times I see a casing with a damaged surface which will give problems in the evaporation.

Every system has a different pressure and if you are not sure, ask the manufacturer. Regularly cleaning of the nozzles is something will help maintaining the right pressure and the right adjustment of the watering trees, looking at distance and height according to the casing level.
Keep watering but do not take it over the top!!


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