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The 2019 average corn and soybean yields for counties and crop reporting districts in Iowa were released Feb. 20 by USDA’s National Ag Statistics Service each year using the December Agricultural Survey and the County Agricultural Production Survey.
On the Iowa State University Ag Decision Maker website, this data is provided in Information Files A1-12 (corn) and A1-13 (soybeans), “Historical Yields by County,” which show county averages from the previous 10 years by county and crop reporting district.
This information is helpful for seeing trends in yields over the past 10 years. Information File A1-14, “Iowa Corn and Soybean Yields,” also uses this data to show the 10-year average yield, and the year and yield results for the highest and lowest years for each county in the past 10 years. This information is helpful in developing corn and soybean budgets, cash-flow projections or other types of analysis for producers in which the actual production history is not available. The crop yields are reported in bushels per harvested acre.
Operators randomly selected
NASS conducts the December Agricultural Survey each year to establish state and national estimates of row crops such as corn and soybeans. The County Agricultural Production Survey is also conducted each year to collect data that are combined with the DAS data and used to establish the county-level yields. The CAPS survey is conducted at the end of harvest.
Each year, a combined 11,000 randomly selected operators in Iowa are interviewed for these surveys. The farm operator reports the whole farm’s planted and harvested acreage, and yield or production...