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Chemical behavior of NH3 and other N sources in soil?
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NE Ridger
Posted 6/30/2020 12:58 (#8345440 - in reply to #8345279)
Subject: RE: Chemical behavior of NH3 and other N sources in soil?

EC Nebraska
w1891 - 6/30/2020 11:43

With the conversion rate and timing is it possible to hold much more N in all forms than the simple 10X CEC rule? Was coming at it from a sidedress NH3 standpoint. In the lighter timber soils it seems that the N response curve/bu is pushed to the right so that more N can be applied and still get a yield response. Hard to get down into that .8 or .5 lb of N per bu here and still grow respectable yields. However if that N cannot be held onto it doesn’t do much good to apply a heavy load at one time. There is response to Y drop and urea sometimes locally but drilling down is this due to a timing thing or just not enough N in general and can a higher rate of NH3 applied at V3-V4 cover this with little environmental loss.

N leaching depends on the amount and rate of water moving down through soil profile. The more water that moves down and the faster it moves, the more N goes with it.

I would think that V3-V4 is close enough to the fast uptake between V6 and V12 that you could apply quite a lot of AA at that point and the corn would catch it before it goes too far. However, if you get massive rains right after application and your soils percolate water rapidly, it could still get away.

It's just a matter of which is faster, the N leaching or the roots taking it up. That's gonna vary by location and year.
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