Based on the impressive rally seen in corn following Wednesday's August WASDE update, it appears traders are expecting the normal pattern of bullish revisions to be followed by further bullish revisions. And who could blame them based on the data?

To begin with, it's worth pointing out that the 75 million bushels (mb) increase in the 2025-26 corn export estimate took ending stocks down to 1.945 billion bushels (bb) compared to USDA's January estimate of 2.227 bb. With 2026-27 corn ending stocks already down to 1.653 bb, there is no room for such a repeated tightening in future reports. Yet there are plenty of reasons to expect it.

New-crop export estimates are still 125 mb below old-crop despite the smaller corn crop in Europe and the war impacting shipping from the Black Sea region. On that front, USDA only reduced Ukraine corn exports by 1 mmt while Ukraine expects it will be 9 mmt below USDA's July estimate. As suggested earlier, USDA's conservative approach should leave the modest reduction in the August update a surprise to no one -- but barring a surprisingly quick end to the war between Ukraine and Russia, future cuts to exports from the region should be a foregone conclusion.

It's worth noting that even though USDA increased the Brazilian corn production estimate for 2025-26 by 2 mmt, it cut its export estimate by 1 mmt due to continued growth in Brazil's domestic use. For 2026-27, Brazil's corn export estimate is unchanged (at 2 mmt above the 2025-26 level). Argentina's totals were left unchanged from last month with a bumper crop already expected to provide sharply higher exports for 2025-26 but a return to more normal levels for 2026-27.

In short, it appears the U.S. will be called upon to make up for the increased import requirements from Europe (primarily). On that front, USDA was likely overly optimistic there as well with the EU corn import estimate only being increased by 1 mmt despite a 3.6-mmt cut in production estimates -- all suggesting future increases in 2026-27 U.S. corn export estimates are likely.

On the supply side, a small crop tends to get smaller. With USDA surprising the trade on how aggressively it cut corn yield this soon, it would be reasonable to expect further reductions in future reports. At 180.7 bushels per acre (bpa), it came in much below the average pre-report estimate of 182.4 bpa and ended up close to the lowest pre-report estimate of 180.5 bpa. Not to toot our own horn, but DTN's Digital Tour national yield estimate of 178.5 bpa is looking pretty good right now. All suggesting further yield and production reductions are likely.

Regarding the surprise increase in planted acres (for the second year in a row), one would expect the revisions Wednesday could be it considering the combined corn and soybean total area already exceeds the previous seeded acre record by 3.5 million. In fact, given the level of silage interest being reported in drought-stricken areas of the Western Corn Belt, the harvested acres as a percent of seeded could very well fall from the August estimate. A rate similar to that seen in 2024-25 would result in 300,000 fewer harvested acres from the same seeded area.

So, if corn exports do climb by 125 mb for 2026-27 to match 2025-26 record levels, and production does fall by 175 mb should the final yield match DTN's 178.5 bpa (current) estimate while harvest acres remain unchanged, ending stocks would be an unrealistic 1.353 bb. Price rationing would be required to prevent that from happening as it would result in a stocks-to-use ratio of only 8.2%. Far too tight for comfort.

I welcome feedback along with any suggestions for future blogs. My daily comments can be found in Plains, Prairies Opening Comments and Plains, Prairies Quick Takes on DTN products.

Mitch Miller can be reached at mitchmiller.dtn@gmail.com

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