Comfortable on the spreadsheet, exposed in real life: South America’s 25-26 crop is now a race against the clock

By Raphael Galo, Head of Agribusiness and Structured Operations at A7 Capital

USDA’s December WASDE, at first glance, looks “calm.” Soybeans still suggest manageable supply, corn turned a bit more sensitive, and the quick takeaway would be: the world has enough grain to absorb some noise. The problem is that, at this time of year, the market often gets it wrong when it confuses numbers with execution. Over the next 4 to 6 weeks, the narrative won’t be driven by table lines, but by the field, the harvest calendar, operational windows, and ports. In other words: the market isn’t debating only how much South America will produce — it’s debating when that supply becomes flow.

For 2025/26 soybeans, USDA made only marginal adjustments from November to December, keeping the same tone. Global production rose from 421.75 to 422.54 million metric tons, global crush edged up from 364.98 to 365.24 million, and global ending stocks increased from 121.99 to 122.37 million. Global exports slipped slightly from 187.97 to 187.70 million metric tons.

This is not a “shock” WASDE. The message is: the world continues to produce and process a lot of soybeans and, in aggregate, can tolerate some noise. But what truly matters for price risk shows up in the composition: once you take China out of the denominator, the cushion looks far less impressive. “World Less China” ends 2025/26 with 77.98 million metric tons (up from 77.60 in November).

That’s not scarcity — but it’s also not such an ample buffer that the market can stay indifferent if South America’s export flow gets delayed.

In the U.S., 2025/26 soybeans are a good example of how “changing nothing” is also information. From the November to the December WASDE, USDA held the key items steady: exports at 1.635 billion bushels, crush at 2.555 billion bushels, and ending stocks at 290 million bushels.

In practice, that means USDA is not asking the U.S. to “fix” supply via an aggressive export revision; it is implicitly counting on South America to deliver a large crop with solid execution.

And that’s where the clock starts to matter more than the estimate.

In USDA’s cut, Brazil remains the main pillar of the story: 2025/26 production stays at 175.0 million metric tons, exports at 112.5 million, and a slight increase in the country’s ending stocks (a sign that, on the spreadsheet, the balance sheet remains comfortable if logistics and timing cooperate).

But Brazil also has another yardstick: the domestic one. Conab projects 2025/26 soybeans at 177.1236 million metric tons, 1.21% above USDA.

That gap doesn’t change the “big crop” thesis — but it can change market behavior at critical moments, because it affects expectations for surplus and shipment aggressiveness in the first half of the year.

The key nuance is that December is not when you “prove” a record crop; it’s when you either preserve the ceiling or begin trimming that ceiling quietly. That’s why the 15-day weather window (Dec 17–Jan 1) matters so much. U.S. and European models point to widespread, recurring rain across much of Central Brazil, with meaningful totals also pushing into the South and reaching Paraguay and parts of northern/central Argentina. For soybean yield potential, the signal is mostly positive: it improves soil moisture recharge and reduces near-term drought stress risk in many regions.

But that same pattern carries a risk that doesn’t show up in balance sheets: operational delays. Long stretches of rain and heavy cloud cover increase disease pressure, complicate field applications, and can delay early harvest. And in Brazil, a harvest delay doesn’t stop at soybeans.

It spills into corn.

If soybeans look “stable,” corn looks more sensitive. Globally, USDA cut production from 1,286.23 to 1,282.96 million metric tons, raised global exports from 203.47 to 205.10 million, and reduced ending stocks from 281.34 to 279.15 million. “World ex-China” also tightened, with ending stocks falling from 107.43 to 105.24 million metric tons.

In the U.S., there was a change the market tends to price quickly: 2025/26 exports were raised from 3.075 to 3.200 billion bushels, and ending stocks fell from 2.154 to 2.029 billion bushels (with ethanol unchanged).

It’s not a “tight” balance like in major short-crop years, but it is a balance that is less tolerant of any Southern Hemisphere delays.

And Brazil is back in the picture again. In USDA, Brazil’s corn stays at 131.0 million metric tons with exports at 43.0 million.

In Conab, the total is higher: 138.879 million metric tons (+6% vs. USDA), with exports at 46.5 million and ending stocks at 13.537 million.

That divergence matters: it’s the weight of the second crop (safrinha). If soybeans push the calendar, safrinha pays the price.

And the market has a practical thermometer for that: Mato Grosso. IMEA projects 2025/26 second-crop corn at 51.72 million metric tons, area at 7.39 million hectares, yield at 116.61 bags/ha, and commercialization still at 25.23% (Nov/25).

If the calendar tightens, the weather premium comes back without asking permission — even before any production revision hits the page.

In Argentina, planting has accelerated in recent weeks. Earlier readings had soybeans at 58.6% and corn at 59.2%; the latest figures (Bolsa de Cereales) show soybeans at 67.3% and corn at 69.5%. That improves market mood because it reduces the risk of a calendar accident.

But Argentina rarely moves price just because of “planted area.” It moves price when it loses uniformity: too much in one region, too little in another, operational difficulties, and localized damage that undermines yield consistency. So even with progress, weather risk doesn’t disappear — it just changes shape.

In Paraguay, the number is smaller, but the psychological impact can be large in sensitive weeks. StoneX projects soybeans at ~10.5 million metric tons (vs. 10.679 million in November), after weather challenges, while USDA runs with 11.0 million.

That gap doesn’t “change the game” on its own, but it signals that Paraguay remains highly sensitive to rainfall distribution — and that matters within the Southern Cone export block.

What is the market really pricing right now?

The market can live with a big crop or with weather noise. What it doesn’t tolerate well is when weather noise changes the timing of flow. That’s why, right now, the most important debate isn’t whether Brazil’s soybean crop will be “very good” or “record.” It’s whether it will be harvested and shipped smoothly enough to open the safrinha window and deliver on the implicit promise of WASDE and Conab.

If rains remain supportive without turning into an operational blockade, the base case remains a large South American supply coming in a wave during Q1, with shorter soybean rallies and a firmer corn tone due to USDA’s adjustment and lower global stocks.

If the rainfall pattern stays persistent enough to delay early harvest and compress the second-crop corn window, the tone shifts quickly. It doesn’t take a disaster: two or three weeks of operational slowdown in Brazil, plus any renewed heterogeneity in Argentina/Paraguay, is enough. Then the market starts paying up again for “pipeline risk”: the physical market reacts first (basis and premiums), and spreads do the rest.

And if the weather is perfect — just-right moisture, harvest moving fast, shipments accelerating — risk migrates from weather to price: the market stops paying a premium and forces adjustment via basis/premiums and seasonal pressure in Chicago.

USDA can call the world “comfortable.” The market will only believe it when South America proves it, day after day, in the weather and on the calendar.