Posted by coonie minnie on July 05, 2017 at 05:54:31 from (50.105.201.209):
In Reply to: Re: Water quality posted by JD Seller on July 04, 2017 at 12:02:19:
JD, the majority of N loss DOES come from applied sources- I've been a Wisconsin Discovery Farm Research site here since 2003, and had real time monitoring of drain tile and surface loss from 2003 through 2009. Google Koepke Farms UW Discovery Farms if you'd like more info on what we did. The vast majority of N loss occurs on crops fertilized with N fertilizer, and usually spikes after fertilization, especially when rain follows. Side dressing will of course help, and most anything is better than fall anhydrous. N loss on alfalfa and beans was usually half or less of corn. Corn "fertilized" by planting into alfalfa (crop rotation) was about half that of corn fertilized by commercial fertilizer.
As for the corn stalks giving off a lot of N, consider this: Pull a sample from one of your round bales- you will be hard pressed to get a feed value much over 4% crude protein. I've been sampling them for 25 years for feed, so have a good idea. If you got 5 dry matter ton of stover (a very high number) times .o4 = 400 lb of crude protein per acre. The formula for Crude Protein is N x 6.25. So divide that 400 by 6.25, and you have 64 lb N. Most of which is bound in organic form, and will slowly release over the next year or so. Some N there, but not a lot, and not totally available. As for it building up over the years, what do your soil tests show? Are you building soil organic matter? If not, you are likely not growing the soil N pool either.
You are doing the right thing splitting application... that is probably the best tool we have to minimize losses. But don't think you will have high losses for years even if you have no fertilizer additions.
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