Posted 6/30/2020 10:56 (#8345156 - in reply to #8345055) Subject: RE: Chemical behavior of NH3 and other N sources in soil?
Yes NH4 is a plant available form, but the Nitrogen from Anhydrous really isn't plant available as soon as it converts. The conversion swings the pH around the core pretty hard and can kill roots and microbes. the pH will have to tame down a bit before roots will grow into this area and uptake the ammonium. Sometimes this can take quite a while sometimes not as much, depends a little on temps and rainfall/moisture. mid season NH3 application the core can be accessible to the plant in as little as 10-14 days, even though shortly after application it is in the NH4(Ammonium) form. This return to normal pH can gradually work its way across the Nh3 core with more and more N becoming plant available over time.