Rio Grande do Sul Wheat Output Falls 37.5% as Canola Jumps 78%
Rio Grande do Sul has sharply reduced its 2026 wheat and barley output estimates while nearly doubling canola production from last year, a crop shift that matters beyond one Brazilian state. The official figures show that acreage choices were already reducing cereal supply before persistent rain began damaging grain quality.
A 23 October re-estimate from Emater/RS-Ascar puts the state’s wheat harvest at 2.162 million tonnes, down 37.48% from 2025. Barley output is projected at 67,242 tonnes, down 42%. Canola moves in the opposite direction: 508,863 tonnes, up 78.25%, even after adverse weather cut the yield forecast made before planting.
The comparison is especially consequential for wheat. Conab’s national outlook places Brazil’s 2026 wheat crop at about 5.7 million tonnes, 27.2% below the previous harvest. Dividing the state estimate by that national figure indicates that Rio Grande do Sul alone would supply about 38% of Brazil’s wheat this year. That is an Agrilinkage calculation based on the two official estimates; the agencies use different survey systems and the national number may be revised again.
The winter-crop re-estimate at a glance
Crop | 2026 area | 2026 output | Change from 2025 |
Wheat | 763,121 ha | 2,161,922 t | −37.48% output |
Canola | 379,887 ha | 508,863 t | +78.25% output |
Barley | 21,591 ha | 67,242 t | −42.0% output |
White oats | 382,637 ha | 832,848 t | −10.99% output |
Source: Emater/RS-Ascar re-estimate published 23 October 2026. Output changes compare with 2025. Percentages have been rounded where shown.
Wheat lost area first, then quality
The biggest part of the wheat contraction is structural. Planted area fell 34.56% to 763,121 hectares, from 1.166 million hectares in 2025. The current yield forecast of 2,833 kilograms per hectare is actually 4.88% above the estimate made at planting, but it remains 5.55% below last year’s realized yield. Put together, less land and a modest yield decline produce the 37.48% output drop.
Rain is now adding a quality problem that a tonnage estimate cannot fully capture. The state report says 19% of wheat had been harvested, with reduced test weight and damaged or shriveled kernels in part of the crop. Conab’s October agricultural monitoring bulletin separately reports that excess rain reduced wheat quality in São Paulo and Paraná, slowed harvesting in Rio Grande do Sul and increased fungal-disease pressure in Santa Catarina.
This distinction matters for millers and traders. A tonne harvested is not automatically a tonne suitable for the same flour specification. Lower test weight or damaged kernels can lead to price discounts, rejection from higher-value channels or diversion to feed. The official releases do not quantify how much Rio Grande do Sul wheat will be downgraded, so it would be premature to translate the observations into a precise milling-wheat shortfall.
Canola expanded, but weather erased part of the expected gain
Canola is the clearest sign of changing winter-crop economics. Its planted area reached 379,887 hectares, 117.83% more than in 2025. Output is still forecast to rise 78.25%, to 508,863 tonnes, but the current yield estimate of 1,340 kilograms per hectare is 17.23% below the pre-planting projection.
The state’s national canola-harvest opening on 13 October had cited an earlier area estimate of 353,397 hectares and an initial production projection near 572,000 tonnes. The new re-estimate lifts planted area but cuts output by roughly 63,000 tonnes from that earlier projection. Rain, hail and strong winds damaged pods and increased shattering and mold risk, particularly in the northwest.
Canola therefore provides diversification and a much larger oilseed harvest, but it is not a direct replacement for lost wheat. The crops serve different processing chains: wheat feeds flour and baking markets, while canola is valued mainly for oil and meal. The acreage shift can improve farm rotations and spread revenue risk, yet it can simultaneously deepen Brazil’s cereal-supply gap.
Barley shows why quality may matter more than yield
Barley area fell 32.55% to 21,591 hectares. Its current yield forecast, 3,114 kilograms per hectare, is 3.11% above the estimate made at planting, but total production is still 42% below 2025 because far less land was sown and last year’s realized yield was higher.
The state report says some malting-barley lots are failing preliminary tests. Germination and grain size are below desired standards, while levels of deoxynivalenol, a mycotoxin associated mainly with Fusarium fungi, are above levels considered adequate in some loads. That does not mean all barley is unusable; it does mean the headline harvest volume can overstate supply available to the malting industry.
What to watch next
Three indicators will decide whether this becomes a broader market problem. First is the share of wheat and barley that meets milling or malting specifications after harvest. Second is the pace at which fields dry enough for machinery to enter. Third is whether disease pressure rises during the remaining grain-filling and maturation period.
For wheat, the immediate comparison is not only with last year but with the rest of Brazil and imported supply. The state’s projected 2.162 million tonnes now sit inside a national crop already expected to be markedly smaller. That gives quality downgrades disproportionate importance even before any price reaction can be established.
The wider grain backdrop also remains fluid. Agrilinkage’s recent analysis of the European Union’s reduced cereal outlook shows how regional weather and quality problems can accumulate across otherwise separate markets. The Brazilian data should be read as an early harvest signal, not a final balance sheet or a price forecast.
Methodology and limits
Agrilinkage compared the Emater/RS-Ascar state re-estimate published on 23 October 2026 with Conab’s national wheat projection and crop-monitoring bulletin. The 38% state share is calculated as 2.161922 million tonnes divided by a 5.7 million-tonne national forecast. Figures are estimates, not final harvest totals. Weather damage observations describe monitored areas and do not establish a statewide share of downgraded grain.
By AgriLinkage Production. Original editorial illustration generated for this article; it does not depict a specific property or event.
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