Editorial Article
Feed Phosphate Is a Sulfur Price With a Quota Attached
A price quoted in yuan that a feed mill in Lagos pays
In the last week of May 2025, Chinese producers of dicalcium phosphate — the feed phosphate that supplies most of the world’s pigs and poultry with their available phosphorus — were quoting 3,150 yuan a tonne out of Hubei and 2,950 out of Yunnan, with the wider range at 2,950 to 3,200. Several producers had raised offers by 100 yuan that week.
Behind those quotes sat two inputs. Phosphate rock at Yichang, 28% grade, was 980 to 1,000 yuan a tonne. Sulfur at port was 2,460 yuan a tonne. Sulfuric acid was firm to slightly up in several regions.
That is the whole structure of this market in one paragraph, and it is not the structure the industry’s own vocabulary implies. Calcium phosphate is not priced off phosphate rock. It is priced off the acid, and the acid is priced off sulfur. The rock is the cheapest line in the cost stack; the conversion is the expensive one.
The acid is where the volatility lives
Rabobank’s April 2025 fertiliser outlook put numbers on the conversion chain for the year: sulfur up 22%, sulfuric acid up 35% and phosphoric acid up 25% against 2024, with all three above their historical averages. Over the same period phosphate rock did not do anything comparable — the Chinese domestic benchmark for 28% material stayed in a 980 to 1,000 yuan band.
For a feed mill, that has a specific consequence. Its phosphate cost is not a rock market it can watch; it is an acid market it cannot hedge, driven by sulfur availability out of the Middle East and by the operating rates of somebody else’s acid plant. When the sulfur price moves 22% and the acid 35%, the 100-yuan-a-tonne moves in dicalcium phosphate are the arithmetic working through, not a demand signal.
And the demand signal is genuinely weak on price. Rabobank’s affordability index for phosphates had been below zero for ten months as of that report, against a record of eighteen consecutive months in 2021–22 — a stretch that was associated with roughly an 8% reduction in consumption. Feed phosphate is not discretionary, but it is substitutable at the margin, which is a different and more awkward thing.
The quota does not stop the trade, it sorts it
The most interesting data in this market is not a price. It is the trade flow, because it shows what an export restriction actually does.
China restricted phosphate fertiliser exports to protect domestic supply — a policy Rabobank described as halting exports to prioritise the home market, with prices for MAP and DAP running around 27% above their ten-year average in the first quarter of 2025. Read only that, and you would expect feed phosphate to stop moving too.
It didn’t. China exported 22,404.1 tonnes of dicalcium phosphate in March 2025, up 45.86% month on month and 24.1% year on year, and 55,800 tonnes in the first quarter, up 23%. The destinations were Japan, Malaysia, South Korea, Vietnam, Pakistan, Indonesia, Kenya, Bangladesh and Chile.
Two readings are possible and only one of them is comfortable. Either the restriction was aimed at fertiliser grades rather than feed grades, or the trade simply re-routed around it. Either way, the observation that matters is the same: an administrative allocation does not remove the molecule from the world, it decides which buyers get it and at what price. Nine named destinations across Asia, Africa and Latin America, none of them with meaningful domestic phosphate conversion, all of them price-takers on a decision made in Beijing about a domestic market.
Three businesses wearing one formula
“Calcium phosphate” describes at least three unrelated commercial situations, and conflating them is the standard error in this category.
- Feed-grade phosphates — dicalcium and monocalcium phosphate, sold on digestible phosphorus and on heavy-metal limits, into a feed mill that formulates to a nutritional requirement.
- Fertiliser-grade phosphates — rock, acid and ammoniated products, sold on P₂O₅ content per hectare, into a farmer’s yield response.
- Specialty calcium phosphates — the abrasive in toothpaste, the leavening acid in baking powder, and hydroxyapatite in biomedical implants, sold on particle size, purity and a regulatory file.
They share a chemical ancestor and nothing else. The feed business is a specification business with a small number of registered producers and a quality dossier. The fertiliser business is a commodity with a nutrient content and a freight cost. The specialty business is a materials business where the sale is a certificate of analysis. A single “calcium phosphate market size” figure spread across all three describes an average of a commodity and a specialty, which is not a useful number for anyone.
The distinction also explains why the European Commission’s decision to identify both phosphorus and phosphate rock as critical raw materials lands unevenly. The criticality argument is about supply risk to a nutrient — which is a fertiliser argument. Feed-grade supply risk is a different problem: it is not that the rock is scarce, it is that the acid capacity and the export licence sit in one jurisdiction and the purity dossier sits with a handful of producers.
Why recovery doesn’t solve the feed problem
The policy answer to phosphate criticality is recovery: struvite from wastewater, ash from sewage sludge incineration, and the nutrient-recovery routes that EU fertilising products rules were rewritten to accommodate. That is a real answer to a real problem, and it is aimed at the right molecule.
It is not aimed at this market. A recovered phosphate competes in the fertiliser channel, where the specification is a P₂O₅ percentage and a contaminant limit. Feed-grade dicalcium phosphate competes on digestibility, on fluorine and cadmium limits, and on being a registered feed material with a dossier that a nutritionist will put his name to. Recovery routes can meet that standard in principle; establishing it takes years per product, and the volumes available are small against a feed industry that buys by the trainload.
So the two halves of the phosphate question — criticality policy and feed-industry supply security — are being solved in different buildings. That is the gap to watch, and it is why feed phosphate buyers should not expect the recovery agenda to change their cost base before 2030.
What to watch instead of the rock price
- Sulfur and sulfuric acid. The two lines in the cost stack that actually move feed phosphate. A 35% move in acid dwarfs anything that happens to rock at 28% grade.
- The monthly Chinese DCP export number. It is the cleanest available read on whether the allocation regime is loosening, and it moves in double digits month to month.
- The affordability index. When it stays negative for longer than eighteen months, consumption responds — that is the one historical record in this market worth using as a threshold.
- Registration timelines for recovered phosphates as feed materials. Not the fertiliser approvals, which are moving; the feed dossiers, which are not.
The unglamorous conclusion
Feed phosphate is a mature additive inside a growing feed market — our animal feed forecast runs from USD 645.8 billion in 2025 to USD 918.5 billion in 2033 at 4.5%, with poultry the largest segment and aquaculture the fastest-growing — and mature additives are where cost accounting beats market forecasting. The buyers who get this right will not be the ones with the best view on global phosphate demand. They will be the ones who know that a tonne of dicalcium phosphate contains more sulfur cost than rock cost, and who have a second qualified supplier for the month when a quota tightens and the vessel that was going to Mombasa goes somewhere else.
Frequently Asked Questions
What sets the price of feed-grade calcium phosphate?
In late May 2025 Chinese producers were quoting dicalcium phosphate at 3,150 yuan a tonne in Hubei and 2,950 in Yunnan, with a market range of 2,950–3,200 yuan. Phosphate rock at 28% grade was 980–1,000 yuan a tonne at Yichang, while sulfur was 2,460 yuan a tonne — the conversion inputs, not the rock, dominate the cost.
Why does sulfur matter more than phosphate rock?
Because the expensive step is converting rock into acid, not extracting rock. Rabobank recorded sulfur up 22%, sulfuric acid up 35% and phosphoric acid up 25% against 2024, while Chinese 28% phosphate rock stayed in a 980–1,000 yuan band. A feed mill's phosphate cost is therefore an acid and sulfur exposure it cannot hedge.
Do Chinese phosphate export restrictions stop feed phosphate shipments?
It sorts it rather than stopping it. China restricted phosphate fertiliser exports to protect domestic supply, yet dicalcium phosphate exports still rose 24.1% year on year in March 2025 to 22,404.1 tonnes and 23% in the first quarter to 55,800 tonnes, across nine principal destinations in Asia, Africa and Latin America. What the restriction changes is who is allocated the molecule and at what price.
Can phosphate recovery from wastewater replace feed phosphate?
Not quickly. Recovery routes such as struvite compete in the fertiliser channel, where the specification is P2O5 content and contaminant limits. Feed-grade material competes on digestible phosphorus, fluorine and cadmium limits, and on having a registered feed dossier. Recovery can meet that standard in principle, but each product needs its own approvals and the available volumes are small against feed-industry purchase sizes.