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Dec 07 2010

Cover Crop plots in December-What can we tell now?

The first day of December brought the first day of snow in northern Indiana.  After the inch or so of snow and some Arctic air the cover crops are shutting down.  Over the past three weeks we received around 5″ of rain so the cover crops were actually growing fairly well heading into December.  Now the question is, what can we tell in December as the cover crops are shutting down.  My answer is “plenty”!

Now that the radish tops are wilting and the peas and annual ryegrass are falling closer to the soil surface you can see the radish tubers more easily.  From the radish tubers I believe we can now see how much nitrogen is being produced from the crimson clover and Austrian winter peas.  Now, this is NOT scientific…but it is pretty obvious that the radishes were considerably larger where there was more crimson clover.  I’ll be posting videos so you can make the observation for yourself.

For your information, the Mixes we are looking at on this post have similar species (different varieties) at different rates/species in the mix.  The first video has more annual ryegrass than the mix in the second video.  The second mix has more crimson clover and also one more pound per acre of the radishes,  So the big difference is in the amount of clover in the mixture.

Now, I’m not saying one mix is better than the other.  It really depends on what your goals are.  In mix #1 there are more deeper roots because of the annual ryegrass.  In mix #2 there appears to be quite a but more Nitrogen being produced (therefore larger radishes-even though there are more radishes to feed).  Mix #2 has approximately 10# of Bruiser annual ryegrass, 7# of AU Robin Crimson Clover, and 3# of GroundHog Radish.  Mix #1 has approximately 15# of Bounty Annual Ryegrass, 3# of crimson clover (I don’t know if it is VNS or a variety)  and 2# of Tillage Radish per acre.  Both mixes have outstanding radishes, outstanding annual ryegrass and I know mix #2 has an outstanding crimson clover.  So it’s not like one good mix and one bad mix…both are good.

So, which mix do you want?  Do you want more nitrogen?   Or do you choose less nitrogen but 5# more annual ryegrass for additional deep roots?  Let me know what you are looking for!

Written by Dave Robison · Categorized: Cover Crop Benefits, Cover Crop Roots, Nitrogen from Cover Crops · Tagged: cover crop annual ryegrass, cover crop mixes, cover crop plots, Cover Crop Radish, cover crops, Crimson Clover, Groundhog radish, nitrogen production with cover crops, Tillage Radish

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