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photo courtesy of Practical Farmers of Iowa
Fall is fast approaching, and Iowa farmers want to make sure their soil and water are protected when corn and soybeans are harvested. Cover crops keep roots in the ground year-round, holding soil in place and keeping nutrients like nitrate out of the state’s creeks and rivers. But which cover crop is best?
To help answer that question, members of Practical Farmers of Iowa have been conducting on-farm research for the past five years to evaluate the performance of cover crops.
Last fall, nine cooperating farmers seeded cover crops into 16 fields across the state. These farmers screened 13 cover crop entries – grasses, legumes and brassicas – to determine fall and spring ground cover offered by the plants. Entries were hand-seeded into standing corn and soybean crops to simulate aerial seeding.
“This research provides an easy way to see whether a potential cover crop is going to do well in your area,” says Chad Ingels, who raises corn, soybeans and hogs near Randalia, and is one of the participants in the project. He says he plants cover crops to reduce erosion and nutrient loss, and to improve soil quality.
Read the full report and results of the variety trials from previous years by visiting practicalfarmers.org/research-
Cereal rye is king of covers
Results show that cereal rye is the most consistent performer in a corn and soybean rotation, producing more fall ground cover, then overwintering well and producing good spring ground cover.
“We found that cereal rye is probably the best at this point for our operation,” Chad says. “However, wheat seems to work too, and this past year, barley also seemed to work pretty well.” He says he plants cereal rye on about three-fourths of his acres, and winter wheat on the rest.In the 2015-2016 trial season, cereal rye typically provided the most fall and spring cover across all locations. At some locations, winter wheat, winter triticale and winter barley provided just as much cover as cereal rye. Oats also provided good fall ground cover at most sites. Other key findings from the past four years reveal that:
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