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2021 DTN Digital Yield Tour - September
By Katie Micik Dehlinger
Tuesday, September 14, 2021 3:23PM CDT

MT. JULIET, Tenn. (DTN) -- Gro Intelligence's national corn and soybean yield models barely budged in the month following the DTN Digital Yield Tour, with each dropping by only 0.1 bushel per acre. USDA's estimates over the same timeframe increased and moved closer to Gro's.

As of Sept. 13, Gro Intelligence pegged the national average corn yield at 176.4 bushels per acre (bpa). USDA raised its estimate to 176.3 bpa, up 1.7 bpa from the previous month, in the Sept. 10 Crop Production report.

On soybeans, Gro's average yield was 51.4 bpa, while USDA's climbed 0.6 bpa to 50.6 bpa.

"I still think those are very good estimates," DTN Lead Analyst Todd Hultman said, noting he thought Gro's numbers were closer to the mark in August than USDA's. While USDA's latest estimates are closer to Gro's, he thinks USDA's soybean estimate could still be a little low.

"Frankly, I think there's still potential for beans to come in higher by the time we get to January, simply because we had a lot of beneficial rains late in the season. We've got a lot of the Midwest that's in pretty good shape, aside from the northwestern states," Hultman said.

The steady trend in Gro's models is unusual, Gro Intelligence Senior Analyst Jon Haines told DTN, noting there's usually a little more variation in their models' estimates from August to September as weather and growing conditions change.

Haines said a steady national yield paired with shifting state estimates reinforces the major trend highlighted by the tour.

"It's that the Eastern Corn Belt has these massive yields that are to a large extent offsetting what's happening in the northwestern Corn Belt," he said. "It looks like we've got some really high NDVI (normalized difference vegetation index) levels in the east and some droughty areas in the northwest that are balancing out to end up with pretty decent national yields."

NDVI maps measure the comparative lushness or dryness of a field relative to average conditions, but they're only one factor in Gro's yield models. Gro's yield models use machine learning to analyze NASA satellite imagery, land surface temperatures, rainfall data, weather forecasts, soil moisture, USDA crop-condition surveys and much more to come up with estimates. (For more on how the models work, please read:….)

Statistically, the model's confidence increases during the month following the DTN Digital Yield Tour. Gro compares its yield estimates' accuracy during the growing season to USDA's final estimates that are released in January. For corn, Gro's August estimate is usually within 4.5 bushels of USDA's final estimate. In September, that number shrinks to 2.5 bushels. On soybeans, the confidence interval tightens from 1.7 bpa in August to 1.3 bpa in September.

By now, the models incorporate weather forecasts through the end of September. According to USDA's weekly Crop Progress report, 87% of the corn crop was dented as of Sunday, Sept. 12. So, by the end of the month, most of the nation's corn will have reached the end of the grain fill stage and yields will be more or less set. Gro issues its final yield estimates in mid-November, around when harvest reaches completion.

While the national numbers showed little change over the course of the month, there were notable updates to individual state yield estimates, both in Gro's models and USDA's estimates. (For a complete recap of the tour's August findings, please visit:….)

The DTN Digital Yield Tour published yield estimates for 10 states, plus North Dakota, throughout the week of August 9-13.

On corn, some of Gro's largest changes occurred in northwestern portions of the Corn Belt. South Dakota saw the largest reduction, 17.5 bpa, to 125.2 bpa. Kansas yield estimates dropped more than 8 bpa to 139.1 bpa, while Minnesota's declined by 3 bpa to 177.4 bpa. For comparison, USDA left its South Dakota and Kansas estimates unchanged at 133 bpa and 138 bpa, respectively, in September, but raised its Minnesota estimate by 8 bpa to 174 bpa.

Gro also had a few state corn yield estimates climb. Wisconsin had the largest month-over-month jump with the yield estimate climbing to 183.1 bpa. Illinois, Indiana and Ohio all saw their yield estimates rise by a bushel or two. While USDA held pat on its record 214-bpa forecast for Illinois, it raised its estimates in Indiana, Iowa and Wisconsin while lowering its forecast for Ohio.

Soybeans saw smaller changes between August and September, but generally followed a similar trend. South Dakota and Kansas yields declined the most in Gro's models, while Wisconsin saw the biggest boost. USDA made some notable changes, lifting Minnesota's soybean yield estimate 4 bpa and adjusting several other states up or down a bushel.

Haines said the state changes in many ways reflect changing growing conditions in August. During the tour, the models still saw potential for crops in parched portions of the Corn Belt if rains materialized. "The model in South Dakota didn't fall off a cliff, but it continued to steadily decline," he said.

ILLINOIS 205 203.5 214 214
INDIANA 192.9 190.2 197 194
IOWA 199.4 199 198 193
KANSAS 139.1 147.3 138 138
MINNESOTA 177.4 180.8 174 166
MISSOURI 172.4 170.6 169 171
NEBRASKA 186.8 187.6 188 186
OHIO 188.1 186.6 190 193
SOUTH DAKOTA 125.2 142.7 133 133
WISCONSIN 183.1 178.5 172 167
ILLINOIS 60.5 60.8 64 64
INDIANA 57.7 58 60 60
IOWA 58.7 57.4 59 58
KANSAS 41.1 42.6 40 41
MINNESOTA 49 48.1 47 43
MISSOURI 49.7 49.7 51 50
NEBRASKA 59.6 60.3 59 60
OHIO 55.8 57.4 58 58
SOUTH DAKOTA 42.6 44.6 38 39
WISCONSIN 53.5 50.5 49 49
NORTH DAKOTA 32.9 33.9 25 24

For more information on the 2021 DTN Digital Yield Tour and past ones, visit here:…. Learn more about Gro Intelligence here:….

Katie Dehlinger can be reached at

Follow her on Twitter at @KatieD_DTN

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