Exploring whether cover crop mixtures make sense on Iowa farmland

Last week I had the opportunity to attend the Soil and Water Conservation Society’s 72nd Annual Conference in Madison, Wisconsin.  In addition to attending some great sessions, meeting fellow conservationists, and exploring Madison, I participated in the Conservation Innovation Grant Showcase poster exhibition.  On display were early results from our cover crops mixtures project that began in 2013.

NCIGCoverCropsPoster-170721

 Some preliminary observations from the study: 

  • Achieved more biomass from the single species (oats or rye) than mixtures
  • Oats and rye resulted in the majority of biomass from the mixtures
  • Cereal rye was the only species to over-winter consistently
  • Generally lower pore water nitrate concentrations following rye and mixture of rye, radish and rapeseed

As we continue to analyze the data collected, the project indicates:

  • Cereal rye and oats establish readily and provide the most biomass growth when seeded on their own.
  • Cover crops can offer some water quality benefits, reducing nitrate concentration in pore water.
  • Rye and oats provide the best biomass return on seed investment! Single Species are the way to go in Iowa for corn and soybean producers.

Be sure to subscribe to our blog and check back for updates on the project, including analysis on crop yields.

Liz Juchems

 

 

Friday Photos: Cover Crops Thriving!

ILF staff visited the Armstrong Research and Demonstration Farm in Southwest Iowa earlier today, and we were pleased to find some good growth in our recently-seeded cover crop plots.   As part of a National Conservation Innovation Grant looking at cover crop mixtures, these plots involve an investigation of three different cover crop treatments:

Treatment #1: Single Species Cover Crop (rye pictured here in corn plots)

Treatment #1: Single Species Cover Crop (Rye in corn plots, 9/26/2014)

Treatment #2: Cover Crop Mixture (Blend of rye, radish, and rapeseed shown here in corn plots)

Treatment #2: Cover Crop Mixture (Blend of rye, radish, and rapeseed in corn plots, 9/26/2014)

Treatment #3: No Cover Crop (in some very nice looking no-till!)

Treatment #3: No Cover Crop (in some very nice looking no-till, 9/26/2014)

 

The crops are looking great in SW Iowa, as are the cover crops.  However, when walking through the plots, beware of badger holes!

20140926_113844

One very ambitious badger makes its home in our corn plots at the Armstrong (SW) Research and Demonstration Farm.

The cover crop species in our plots are different based on whether they are planted into standing corn or soybeans.  The above images all come from standing corn.   Here’s a view from the soybean plots, as well:

Cover Crop Mixture used in Soybeans (Blend of oats, radish, and hairy vetch)

Cover Crop Mixture used in Soybeans (Blend of oats, radish, and hairy vetch, 9/26/2014)

How are your cover crops looking this fall?  We’d love to see any photographs you may have, and will share them in future blog posts. Send them to us at ilf@iastate.edu.

Ann Staudt