Iowa Learning Farms: cover crop acres grow but rate of growth declines in 2017

February 27, 2018

Ames, IOWA - According to the Iowa Learning Farms 2017 Field Day Evaluation Report, Iowa cover crop acres grew last year by approximately 22% to 760,000 total acres. While the positive growth with shrinking profit margins is notable, the rate of growth is ten percent less than the growth measured in 2016, and still well below the goal of 12.5 million acres of cover crops called for in Iowa’s Nutrient Reduction Strategy.

Many of the new acres were planted by experienced cover crop farmers. The majority (69%) of respondents to Iowa Learning Farms’ year-end evaluation questionnaire started seeding cover crops at least three years ago. Only eleven percent of respondents reported implementing cover crops for the first time on their land last year. Those respondents with cover crops reported an average of 46% of their total row crop acres in cover crops—6% more than in 2016.

“It is encouraging to see growth in cover crop use among experienced cover crop farmers, even with low crop prices,” commented Jamie Benning, Iowa State University Extension Water Quality Program Manager and Iowa Learning Farms advisor. “This growth indicates that farmers are finding value in planting cover crops and want to see those benefits on additional acres.”

The overall percentage of farmers who are using cost share to seed cover crop acres has increased by seven percent over four years of Iowa Learning Farms evaluation data. Of the respondents seeding cover crops in 2017, 65% of them did so with the assistance of cost share.

Iowa Learning Farms sponsored 29 conservation field days and workshops in 2017 on cover crops, strip-tillage, saturated buffers, prairie strips and more. These events drew an attendance of 1,280 people, primarily farmers and landowners (89%). Twenty-seven percent of Iowa Learning Farms field day attendees were female.

In January 2018, 580 farmers and landowners who attended Iowa Learning Farms field days were mailed an evaluation questionnaire to investigate whether they made changes to their farming practices. In a one-month period, 251 evaluation questionnaires were returned for a 42% response rate.

The Iowa Learning Farms 2017 Field Day Evaluation Report can be found at

Established in 2004, Iowa Learning Farms is building a Culture of Conservation by encouraging adoption of conservation practices. Farmers, researchers and team members are working together to identify and implement the best management practices that improve water quality and soil health while remaining profitable. Partners of Iowa Learning Farms include the Iowa Department of Agriculture and Land Stewardship, Iowa State University Extension and Outreach, Leopold Center for Sustainable Agriculture, Iowa Natural Resources Conservation Service, and Iowa Department of Natural Resources (USEPA section 319).