Corn+Soybean Digest
Cover crops interseeded at V5 or V6 were healthy green and ready to explode as corn dried down prior to harvest

Cover crops interseeded at V5 or V6 were healthy, green and ready to explode as corn dried down prior to harvest.

Farming for water

Think Different Ackerman talks of his cover crop benefits: Fall-seeded rye stopped waterhemp and increased yields Cover crops and no-till soils can handle huge rain events He found success interseeding corn at V6-V7

While many farmers rely on spring tillage to dry out wet soils, Jerry Ackerman goes the other way. His cover crop/no-till program helps him handle heavy rains and wet soils better than tillage and drain tiles. In 2013, it even helped him fight waterhemp thanks to the strips of cereal rye he seeded the previous fall in soybeans and corn.

"Spring 2013 I no-till drilled soybeans into 18-inch tall cereal rye," recalls Ackerman. "There were spots in the field so wet that water was standing in the tracks of my duals. It was so wet I couldn't kill the rye until after the soybeans were established. The rye just kept sucking water. I also planted corn into a strip of rye seeded the fall before. It controlled the water hemp in that strip and yielded 20-25 bushels more per acre than the strips without the cover crop.

Wet soils are nothing new to Ackerman, who farms 1,200 acres in Jackson County, Minn., just a few townships north of the Iowa border and about 100 miles west of I-35. The county features rich but mucky soils and low elevations, notes Catherine Sereg, watershed technician, Heron Lake Watershed District. Sereg knows the soils on Ackerman's farm well, having done water infiltration tests there as well as on conventionally tilled soils in the area.

Soils handle a lot of rain

"Jerry can get out in fields when normally it's too wet to do so," says Sereg. "His soils handle the equivalent of 8 inches of rain an hour. I've seen similar soils that are conventionally tilled without cover crops that can't handle an inch of rain."

After 15 years of no-till soybeans, strip-till corn and periodic rotation to alfalfa, Ackerman thought his soils were in good shape. Five years of experimenting with cover crops, including planting them on prevented planting acres in 2013, has taken his fields to a new level.

Parts of those trials have included different methods of seeding the cover crops. He has used fixed-wing and helicopter aerial seeding, spinner spreader and more. The difficulty with aerial is conflict with crop spraying, as Ackerman wants the seed in the ground early. Drilling after harvest is not an option with the short growth window.

"I like to start flying seed on anytime after the 10th of August, but if a pilot can be spraying 250 to 300 acres with pesticides versus 25 acres with cover crops, that's what he will do," says Ackerman. "Last year I did some soybeans August 6, but that was too early with my 10-inch rows. Guys who flew them on 30-inch rows got a good stand."

 

Interseeding cover crops

Recently he has tried different methods of interseeding in corn. After experimenting some last year, Ackerman interseeded all his corn acres this year.

On a new farm that he rented in March, Ackerman planted oats and peas early to stop wind erosion. The previous renter had left virtually no residue harvesting all the cornstalks. By the time he needed to plant soybeans, the cover was 8 inches high.

"I would like to have let them get bigger and then use them as mulch to help control weeds after spraying with Roundup," says Ackerman. "I think we could have gotten by with burndown and one more shot of Roundup but it had to be terminated by crop insurance rules."

On his corn acres, he came back with a shot of Roundup and a half rate of Harness followed by a shot of Liberty and then interseeded the 30-inch rows with three rows of annual rye, medium red clover, rape and forage turnips. An acquaintance, Bruce Brunk, had recently invested in a new 15-foot wide, multi-purpose, no-till drill from InterSeeder Technologies. Developed by Pennsylvania State University, it can be used to plant six 30-inch rows, solid seed at 7 1/2-inch rows or any variation, such as Ackerman's interseeding. 

10-inch tall cover crops by harvest

cover crop interseeder
Bruce Brunk's Interseeder layed down three (7 1/2-in.) rows of a cover crop mix at V6 and V7 in Jerry Ackerman's corn this past June. Within 4 days the cover crop seedlings were emerging.

"Bruce did 260 acres of corn for me at V6 and V7 stages. I would have liked it earlier, but herbicide application and rain held it up. It was up in two days and 4-6 inches high by Aug. 1, where it will wait until the corn begins to dry down."

Ackerman is anxious to see the yield results this year. Interseeding a test area with a RoGator and spinner at V7 or V8, followed by five inches of rain produced a five-bushel yield increase in 2014.  At harvest the cover crop was 10 inches tall and growing. He expects at least that from this year's interseeding with benefits to come.

"Over the past five years, I've gradually increased my use of cover crops, always verifying what worked and what didn't," says Ackerman. "Sometimes it has been an eye opener, like seeing a 22-bushel increase in corn yields where we had cover crops. Wet spots in fields are getting fixed, and I can get into fields one to two days earlier, and I don't have to add as much tile. This year every acre will have cover crops growing on it."

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