Posted 6/30/2020 11:43 (#8345279 - in reply to #8345156) Subject: RE: Chemical behavior of NH3 and other N sources in soil?
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.