Reading the Crop-Nutrient Cycle

Grain Margins Lead, Nutrient Prices Follow

Fertiliser demand follows crop economics on a lag, and the lag is what trips up quarterly analysis. Farmers buy nitrogen, phosphate and potash when the crop they expect to sell will cover the bill. Grain prices, application decisions, distributors’ stocks and world nutrient prices each move on their own clock. A urea spike in April means supply tightened faster than buyers could put off their purchases.

Crop Prices and Affordability

Farmers decide how much to apply on the margin they expect for the planting season, not on one day’s futures price. When grain margins shrink, distributors see it first: farmers defer purchases, producers keep shipping, and stock builds up in the distribution channel. When margins widen, farmers replenish soil nutrients and benchmark prices firm.

Nutrien sees both ends of that chain. Its Retail arm, which sells to farmers, earned $1,736M of EBITDA in FY2025. A pure producer such as CF Industries has no retail arm, so it sees the chain only from the plant end.

The 2026 Hormuz Shock

The 2026 Hormuz shock hit nitrogen far harder than potash. Disruption in the Strait of Hormuz in March and April 2026 tightened nitrogen supply, and Middle East urea went from $472/t in February to $857/t in April (World Bank). Granular potash landed in Brazil rose only from $373/t to $401/t over the same months. In its April 2026 outlook the World Bank expected fertiliser prices to rise in 2026 and ease in 2027.

A DCF or EV/EBITDA built on spike prices overstates nitrogen and phosphate earnings; one built on a trough year understates them. The mid-cycle earnings guide sets out the long-run prices used in the Excel model that comes with the primer, and rebuilds EBITDA from them.

Nutrien’s own mid-cycle scenario, from its 2024 Investor Day, used potash at $400/t, New Orleans urea at $400 per short ton and New Orleans DAP (diammonium phosphate) at $515 per short ton. It gave $7.0-7.5bn of adjusted EBITDA, above the $6,046M Nutrien earned in FY2025. A company’s scenario and a set of long-run assumptions will differ, so pick one set and keep to it.

The Lag Structure

Four lags separate a grain price from a producer’s results:

1. Grain price to application decision: one planting season, 6-12 months in the Northern Hemisphere.
2. Application to producer shipments: distributors buy ahead, so producer volumes can trail the benchmark by a quarter.
3. Benchmark to realised price: contracts lag, and the price is measured at a different place. Mosaic realised $255/t for potash at the mine in FY2025, against a 2025 average of $347.5/t landed in Brazil.
4. Gas cost to nitrogen margin: the shortest. CF’s gas cost, $3.31/MMBtu (million British thermal units) in FY2025, feeds through within a quarter.

A downturn reaches the high-cost end of a cost curve first. As the price falls towards a producer’s unit cost its margin disappears, while a lower-cost producer still earns. The cost curve guide sets out the filed unit costs, each on its own definition and unit.

Reading the Cycle in Filings

Producers’ results show the same lags. Nitrogen producers report gas cost and urea prices for the same quarter, so the gas lag is visible within one set of results. Integrated producers split potash, nitrogen, phosphate and retail. Mosaic realised $670/t for DAP at the plant in FY2025, while the US Gulf export benchmark averaged $685.2/t in 2025; the two differ in timing and in where the price is measured.

For equity work:

• Grain prices show where demand is heading.
• Nutrient spot prices drive the next quarter’s revenue.
• Valuation runs on long-run prices, unless you are modelling a spike on purpose.
• The cost curve shows who loses margin first.

The N/P/K guide sets out which input drives each nutrient, and so which part of the cycle hits which producer. CF turns on urea and gas, Mosaic on rock and ammonia, and Intrepid Potash on potash and Trio, a potassium, magnesium and sulphur fertiliser.