Global grain markets open Monday, September 28, broadly lower, led by a sharp decline in soybeans. The newly negotiated US-China trade arrangement reduces reciprocal tariffs and improves access for several US agricultural products, including feed grains, but soybeans themselves were left off the tariff-reduction list. Corn is also weaker despite the improved trade outlook, while wheat remains under pressure from favorable US moisture and continued uncertainty around Black Sea shipping.
China Tariff Relief Splits Corn and Soybeans
The biggest market-moving development Monday is the different treatment of corn and soybeans under the latest US-China trade agreement. China removed tariffs on several US goods, including corn, improving the potential for US feed-grain sales. Soybeans, however, were excluded from the tariff-relief list, leaving Chinese purchases of US beans largely dependent on state-controlled entities such as COFCO and Sinograin.
That distinction explains the sharp divergence in early sentiment. Corn has a potentially constructive new demand channel, even though futures are lower, while soybeans are facing an immediate bearish reassessment because broader commercial Chinese buying remains constrained. The result is a much heavier start for beans and meal than for the feed-grain market.
Soybean Longs Become Vulnerable as Trade Expectations Reset
Soybeans are under the heaviest pressure Monday, with the market falling below Friday’s lows as traders reprice the China demand outlook. Managed money had increased its soybean net long by 20,331 contracts to 265,041 contracts as of September 22, leaving the position within roughly 1,000 contracts of the recent record. Across the soybean complex, the net long had expanded to around 554,000 contracts, while soymeal speculative length reached a record 192,000 contracts.
This heavy positioning creates additional downside sensitivity when a bullish trade assumption disappoints. The tariff decision does not eliminate Chinese soybean demand, but by continuing to limit purchases mainly to government-controlled buyers, it reduces the scope for the broader buying response that speculative longs had been positioned to capture.
Weak Sinograin Auction Adds Another Demand Signal
China’s domestic reserve activity also deserves attention. Sinograin sold only 191,699 MT of imported soybeans, approximately 37% of the volume offered, in its overnight auction. The relatively low take-up adds another cautious signal for nearby soybean demand at the same time that tariff treatment is weighing on expectations for US commercial exports.
For US beans, that combination leaves the market dependent on existing state-linked purchases while traders reassess how much incremental Chinese demand can realistically emerge under the new agreement.
Wet Western Corn Belt Slows Harvest but Cannot Offset Soybean Selling
Weekend rainfall continued across the western Corn Belt and Southern Plains, while the Central Midwest and eastern Corn Belt experienced generally favorable harvest conditions. Moderate to heavy rain is expected to keep slowing fieldwork in the western Corn Belt through midweek before drier conditions develop later in the week.
For soybeans, delayed western harvest should provide some underlying physical support because slower crop movement can temporarily tighten nearby supplies. For corn, however, favorable conditions across roughly two-thirds of the Midwest are allowing harvest pressure to remain an important bearish influence, particularly while the broader grain complex trades lower.
South American Planting Advances Near Last Year’s Pace
South America is beginning to contribute more directly to the new-season supply narrative. AgRural estimated Brazil’s first corn crop at 34% planted, ahead of 32% last year, while Brazil’s soybean crop in the Center-South was estimated at 3.4% planted, close to last year’s 3.2% pace. Another estimate placed Brazilian soybean planting at just over 4%, in line with a year earlier.
Moderate to heavy rains are affecting Buenos Aires and far southern Brazil, while scattered rainfall is expected across most South American growing areas this week with normal to below-normal temperatures. The developing planting season therefore remains an important competitive supply factor for both corn and soybeans.
Corn Gains a Trade Opportunity but Faces Harvest and Positioning Pressure
The removal of China’s tariff on US corn is fundamentally supportive for future export possibilities, but the market is not responding with an immediate rally. Weaker soybean prices are spilling over into corn, while favorable harvest conditions across much of the Midwest continue to bring seasonal supply pressure into the market.
Fund positioning is also significant. Managed money reduced its corn net long by 12,405 contracts, but still held 414,437 contracts net long as of September 22, leaving speculative exposure near historically elevated levels. Large existing length means the market remains vulnerable to additional liquidation if improved China access does not quickly translate into confirmed demand.
US Stocks Expectations Move Into Focus
Monday’s outlook also places upcoming US stock estimates firmly on the market’s radar. Traders expect September 1 corn stocks at 1.918 billion bushels, compared with 1.551 billion bushels last year and slightly below the USDA September 2026 WASDE estimate of 1.922 billion. For soybeans, September 1 stocks are expected at 324 million bushels, almost unchanged from 325 million a year earlier and the USDA estimate for 2025/26 ending stocks.
The contrast matters. Corn enters the session with expectations for substantially larger year-on-year stocks, reinforcing harvest-related supply pressure, while soybean stocks are expected to remain broadly unchanged from last year.
Plains Rain Keeps Pressure on Wheat
Wheat remains lower as rainfall improves moisture conditions across key US growing areas. The seven-day outlook calls for 2–4 inches of rain from Texas to Nebraska and farther east, adding much-needed soil moisture in dry areas even though fieldwork and planting progress may temporarily slow.
For winter wheat, the moisture benefit is currently outweighing concerns about planting delays. Chicago, Kansas City and Minneapolis wheat are all lower Monday morning, with Minneapolis also breaking below its cited 100-day moving-average support.
Black Sea Risk Remains Unresolved
Black Sea developments continue to provide an important counterweight to the bearish US weather picture. Ukraine’s agriculture minister sees no signs of a Black Sea ceasefire in the coming months, while Turkey submitted a proposal to Russia late last week aimed at allowing Black Sea shipments. No peace talks are currently being considered, and Russia reported additional overnight strikes.
At the same time, an estimate in the Monday outlook indicates that 80% of Russia’s Black Sea grain export terminals could be operational once a peace agreement is reached, as they have not sustained significant damage. This leaves wheat facing two opposing possibilities: ongoing conflict maintains logistics risk, while any eventual agreement could restore substantial export capacity relatively quickly.
Energy Rises While the Dollar Adds Export Headwind
Macro markets provide mixed signals for agriculture. Nov ’26 WTI crude oil is up $2.60/barrel at $95.00, RBOB is $0.02 higher and heating oil is up $0.17/gallon. Higher energy provides some cross-market support, particularly for products linked to vegetable oils and biofuel economics.
The US dollar is moderately higher while remaining inside Friday’s range, and US stock indices are lower. The firmer dollar is a mild headwind for US export competitiveness, adding to the broader bearish tone despite stronger energy prices.
Wheat Futures
Wheat begins Monday under broad pressure. Dec ’26 CBOT wheat is down $0.07 1/4 at $6.96/bu, while Dec ’26 KC wheat is down $0.12 at $7.50/bu. Dec ’26 Minneapolis wheat is down $0.14 at $7.06/bu, falling below its cited 100-day moving-average support at $7.09. Improved Plains moisture, weak US export commitments and expanding speculative shorts are weighing on prices, while continued Black Sea conflict prevents the market from fully removing geopolitical risk. US wheat production is expected at 1.524 billion bushels, down from 1.531 billion in August, while September 1 stocks are expected at 1.872 billion bushels, below 2.134 billion a year earlier.
Corn Futures
Dec ’26 corn is down $0.05 at $5.23/bu, remaining within Friday’s trading range. China’s removal of the corn tariff improves the longer-term US demand opportunity, but weaker soybeans and favorable harvest conditions across much of the Midwest are dominating early price action. Managed money remains near record length despite recent selling, while expected September 1 stocks of 1.918 billion bushels keep supply firmly in focus.
Soybean Futures
Soybeans are leading Monday’s decline. Nov ’26 soybeans are down $0.24 at $12.95/bu, with the next cited support at the September low of $12.90 1/4. Oct ’26 soybean meal is down $7.50 at $366.40, while Oct ’26 soybean oil is down 16 points at 67.10; crush margins are up $0.02 at $2.47/bu. The exclusion of soybeans from China’s tariff reductions, heavy speculative length and limited participation in the latest Sinograin auction are driving the selloff, while wet western Corn Belt harvest conditions provide the main underlying support.