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rebuilder

Posted 11/10/2015 19:55 (#4888951 - in reply to #4888568)
Subject: RE: alleopathy from rye

Indiana

Rainman,

yeah, I have seen some of those articles. I have yet to see that on this farm. My feelings are that these tests are done on a one year trial....not on long term no-till / long term cover cropped fields.

Here is my description/ opinion on rye allelopathy from another post: http://talk.newagtalk.com/forums/thread-view.asp?tid=459903&posts=52&highlight=allelopathy&highlightmode=1#M3745713

.....it is being discussed that the "allelopathy" that every one thinks of is actually a starvation of nutrients. Cereal rye is a classic example. It sucks up sooo much N which is then locked in the high C:N ratio of the fodder.....the soil has none to supply, and the corn dies.

And Barry Fisher has said often that sometimes the best soybean yields he has seen is after a cereal rye cover crop.

For the same reasons corn has trouble....lack of N,... that same lack of N makes the soybean start pulling N out of the air much sooner and at higher quantities (Barry's theory....but I agree with it).

So, I put down at least 30 #N (along with 36#P, 8#S, trace Zinc#) in my starter, and side dress early as I can.

However, I have been no-tilling for many years now, and my opinion is my soils have a lot of readily avail N through micro biology / S.O.M. etc,. I suspect, that If I was conventional tillage and jumped right into a cereal rye cover crop, and planted corn into it without killing it early. and not bumping the N in starter or early AMS spreads...then yes, I'm betting that some issues might show up.

While on this subject....I have heard Bob Nielsen (Purdue Corn guy) hypothesize that the "soybean credit" that N we always attribute to a previous bean (legume) crop....is not so much an N "credit" as it is less N tied up in the fodder like in a Corn-on-Corn rotation.

I'm to tired right now or I would link those statements / research, so I will end with

......that is my opinion.

With this being your first year, I would advise that you terminate "most" of your rye two weeks or so early, but leave a few acres that you can experiment with planting green into.

Also....don't feel like you have to have a beautiful, clean, residue free seed zone from your row cleaners. You are now in a different paradigm with covers, than with straight no-till. I do not use my row cleaners hardly at all when planting into covers (both dead and green). Just make sure that you have sharp seed discs, and plant deep enough to get good seed-to-soil contact.