Missouri corn growers making harvest sales are navigating renewed questions about federal crop estimates after USDA acknowledged a reporting error that affected its September national corn forecast.
The mistake involved calculations for Kansas and Nebraska, but its reach extended to the national production figures that help shape grain market expectations. Missouri was not identified among the states with directly affected field observations.
USDA’s National Agricultural Statistics Service announced the correction Oct. 23, following questions about its Oct. 9 Crop Production report. The agency says it reviewed the October estimates and determined those forecasts remain unchanged.
For Missouri producers, that distinction matters: USDA corrected the previous month’s figures without lowering its latest estimate of the corn crop.
Mistake Affected National Forecast
NASS says the error occurred when it combined observations from irrigated and nonirrigated corn fields in Kansas and Nebraska. Incorrect acreage weights affected the calculations used in the September report.
After correcting the mistake, USDA raised Nebraska’s September corn yield forecast from 177 to 182 bushels per acre. Kansas’ forecast declined from 121 to 118 bushels.
The changes increased the national September yield forecast from 178.5 to 178.8 bushels per acre.
The error also affected September corn plant populations and ear counts for the two states, corresponding averages across 10 states, and production forecasts.
Because the September national yield estimate was originally too low, the increase between that report and October appeared larger than it would have with the corrected figures.
Missouri Sales Face National Market Influences
Corn grown in Missouri competes in a national market. Estimates of the overall harvest help buyers and sellers assess available supplies, even when a revision originates in another state.
Producers deciding whether to sell grain at harvest, place it in storage or arrange delivery later must weigh those national supply expectations alongside their own yields, storage expenses and local bids.
A correction to an earlier report does not change the terms of sales already completed. Its effect on any individual Missouri operation depends on when the producer marketed grain and the price received.
The USDA notices do not provide a Missouri-specific estimate of financial losses.
Corn Association Calls for Changes
The National Corn Growers Association responded sharply to the correction in an Oct. 23 public statement.
Association President Matt Frostic says reporting mistakes undermine growers’ confidence in federal agricultural statistics. The organization is calling for NASS to examine the procedures behind the error and explain how it will prevent similar problems.
The association also contends that recent USDA reports have reduced corn growers’ market value by billions of dollars. Its statement does not include a calculation isolating losses caused by the September processing error.
USDA Promises Additional Checks
NASS says it has corrected the affected September information in its Crop Production reports and Quick Stats database.
The agency says additional checks before publication will verify the acreage weights used in its calculations and validate results from field observations. It is also evaluating further changes to its quality-control procedures.
USDA’s October corn yield and production forecasts remain in place following the review.
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