| jbgruver - 11/20/2024 21:42 It is generally good risk management to apply a modest rate of supplemental fertilizer N when using hog manure as the primary source of N for corn. The problem isn't that the N in hog manure becomes available more slowly than predicted by the manure analysis (most of the N in hog manure is ammonium and does not need to decompose to become available) but rather that hog manure is normally NOT uniform in analysis or application rate. With 245 lbs of "available" N applied into cool soil, 10 gallons of UAN-28% applied as a carrier for your herbicide program should be more than enough to compensate for the non-uniformity of N availability from hog manure most of the time. Joel WIU Agriculture
I agree with this.
Applying hog manure is not nearly as exact as applying commercial fertilizers. The analysis of the manure is not 100% consistent from top to bottom (although N is more consistent than P and K) and application rates are not 100% uniform. No matter how hard anyone tries, you will NEVER get exactly 4000 gpa uniformly on the entire field.
Say you have a 8000 gallon tank applying 4000 gpa, you empty the tank every 2 acres (or less because of foam in the tank). Every time you empty the tank the flow rate from the pump starts dropping as you get down to the bottom of the tank. So you slow down to keep the rate up (gpa), then the next problem is that you lose pressure in the manifold and don't get uniform flow to all of your hoses. If you haul your own manure you know this, if its custom applied they tell you that they put on 4000 gpa and you assume that means 4000 gpa uniformly across the whole field. It just does not happen that way.
10 gpa of 28 or 32 as your pre emerge carrier is a good way to cover a lot of the variability issues of hog manure.
IMO, if you have more acres available to apply on, I would lower your rate in the future and use commercial fertilizers to make up the difference of what you need.
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Hog manure N question
