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Drought cut Europe's grain forecast again. Can seaweed biostimulants play a role in yield stability?

  • Writer: Felix Ghyczy
    Felix Ghyczy
  • Jul 27
  • 6 min read


Successive heatwaves since May have pushed European river systems to critically low levels and set the conditions for fires across France, Spain, Italy and Scotland. Scientists from twelve European countries in the World Weather Attribution group looked at the April to June period and found something more uncomfortable than a simple climate headline: the lack of rain itself was not clearly driven by climate change, but the extreme heat that followed made the rise in evaporation potential roughly 80 times more likely. Warm air pulled the water out of soil that had started the year wet.

For anyone buying agricultural raw material, the number that matters is not the temperature. It is what COCERAL published this month, and what it implies about the next three seasons rather than this one.


A 23 million tonne gap, and a third disappointing maize year

COCERAL took the unusual step of issuing an extraordinary crop forecast outside its normal cycle. It put total 2026 grain production for the EU and UK at 286.6 million tonnes, around 9 million tonnes below its June estimate and 23.4 million tonnes below last year. Soft wheat came down to 140.8 million tonnes against 149.8 million in 2025. Maize took the sharpest revision, cut to 52.7 million tonnes, with the French crop falling to 9.4 million tonnes from 13.8 million a year earlier. World Weather Attribution describes historic losses across the continent, including France's smallest maize harvest in 50 years and more than one million hectares of maize lost in Romania.

The structural point underneath the headline is timing, not heat. Winter crops that had almost finished grain filling when the heat arrived came through in reasonable shape. Spring and summer crops caught in mid development took the loss. That is not a one year problem, because it describes a category of crop rather than a category of weather.

The market has already been repricing this. EU maize acreage has contracted by more than 15% over the past decade as growers move to sunflowers and other spring alternatives, driven by repeated yield disappointment rather than by a single event. Buyers who treat 2026 as an exception are reading the wrong signal. The distribution has shifted, and input decisions for 2027 are being made now.


What a synthesis of 198 studies says about seaweed extracts

A pooled analysis published in Frontiers in Plant Science in April 2026 brings some discipline to a category that has been sold on enthusiasm for a decade. The authors synthesised 198 peer reviewed studies covering 2,021 independent comparisons between seaweed extract treatments and untreated or conventionally managed controls.

Across the full dataset, seaweed extract application increased yield by an average of 16.3%, with a confidence interval of 13.5% to 19.1%. The interesting detail is in the breakdown.

  • By climate: warm arid zones returned 25.6% and warm semi arid zones 17.5%. Tropical monsoon and savannah zones reached roughly 30% to 33%. Effects in cooler zones were not statistically significant.

  • By crop group: vegetables and melons around 21%, legumes 19%, cereals 16%, fruit and nuts 8.8%. Roots and tubers showed no significant response.

  • By application method: fertigation 20.6% and drench 19.0%, both applied to the soil, ahead of foliar application at 15.5%. Seed treatment showed no significant response.

  • By timing: early applications at BBCH stages one to three, repeated four to six times, produced the most consistent gains at around 26% to 42%.

  • By extraction method: alkaline hydrolysis at 21.2%, water based extraction at 16.6%. Most other methods were compatible with no effect at all.

That last line is the one most buyers skip. Two products can both be truthfully labelled as seaweed extract and sit at opposite ends of that range.




The sourcing problem: the best evidenced species is not a farmed crop

Here is where this becomes a supply question rather than an agronomy question.

The species with the most stable and most precisely estimated performance in the dataset is Ascophyllum nodosum, at 16.3% overall and 15.3% in commercial products. It dominates the biostimulant market for good reason. It is also not farmed. It is a wild intertidal stock harvested along the North Atlantic in Canada, Ireland, Norway, Iceland, Scotland and France, and its supply is capped by ecology and regulation rather than by capital.

New Brunswick sets a maximum harvest rate at 17% of standing stock. Nova Scotia restricts harvesting to manual methods to protect recruitment. Maine requires a minimum length of plant to remain above the holdfast. Norwegian rockweed governance remains notably thin. Irish production has run historically at something in the range of 5,000 to 28,000 tonnes wet weight per year, cut by hand.

Set that against demand. Mordor Intelligence puts the global biostimulants market at USD 4.46 billion in 2025, growing to USD 7.29 billion by 2030 at a compound rate above 10%, with Europe the largest regional market. Demand is compounding at double digits against a raw material that cannot be scaled by building a factory.


Three consequences for a buyer. Multi season volume commitments on Ascophyllum are genuinely hard to obtain, and a supplier who offers one without explaining the harvest base is worth a second look. Alternative species carry real but more variable evidence: Laminaria, Gracilaria and Kappaphycus all showed positive responses with wider intervals, while Ecklonia maxima returned only 6.6% in commercial products. And extraction method is a specification item, not a manufacturing detail, so a spec that says only seaweed extract is not a spec.

One thing that has become easier. Since 16 July 2022, plant biostimulants have had their own category under Regulation (EU) 2019/1009, listed as PFC 6, with a CE marking pathway across all 27 member states. There is now a clear compliance question to ask a supplier, and a clear answer they should be able to give.


What this means for your 2027 input plan

Take one crop and one region where the last three seasons have cost you yield, and put four questions to any biostimulant on offer. Which algae species. Which extraction method. What does the field trial evidence look like in your specific climate zone rather than pooled globally. And where does the biomass physically come from, with what harvest rights behind it.

If a supplier can answer the first two and not the last two, you have a product, not a supply chain.


Where BlueBurn fits

BlueBurn helps companies bridge the gap between promising agronomic evidence and qualified, regulatory compliant supply. We connect buyers across food, agriculture, packaging, cosmetics and biomaterials with verified algae producers and processors, run independent market analyses, and advise governments and industries on algae roadmap planning.

Our position sits inside the institutions shaping the European algae industry. We are members of the European Algae Biomass Association (EABA) industry commission and the European standards committee CEN/TC 454 Algae and algae products, which means we are not observing the sector from the outside, we are helping write the standards by which it operates.

Most engagements start with a BlueBurn Quick Scan: a focused assessment that identifies which ingredients in your current formulation could be substituted with algae based alternatives, what supply and cost look like for each, and which substitutions are worth pursuing first. From there, we shortlist qualified producers, walk you through the regulatory path in your destination market, and help you build supply that is resilient by design rather than by accident.

If you are exploring algae for your product line, or just trying to figure out whether you should be, get in touch. Tell us what you are working on, and we will tell you whether algae fits, what timeline is realistic, and which producers we would put on your shortlist.


References


BlueBurn works on algae as a cross industry resource and on sourcing it reliably, from agriculture to packaging to materials. If you are exploring algae for your own product lines, we would like to hear what you are working on.

 
 
 

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