Re: Exactrix TAPPS?
Nitrogen use effieciency is 50%. Thats it folks, the rest leaves the system via Denitrification (Nitrate to Nitrous Oxide), Volatilzation (the escape of NH3, either from the shanks or from Ammonium turning back to NH3 in high pH soils), and by leaching.
Now most think that when we get a lot of rain, we lose our Nitorgen by leaching, but in fact, d**n near all of it is going up into space. Nitrate leaching on the praries is about 5mm a year, thats it.
As for this exatrix system making some kind of "magic Nitrogen" that sticks, its complete BS!!!! NH3 turns to NH4 almost immediately, and in high pH, it can turn back to NH3 right away. You have to keep in mind that as soon as there is NH4 (Ammonium) in the soil, two types of bacteria attack it and turn it into N03 (Nitrate). That is the form it would rather be in, and that is why when soil test labs test for N it is always the Nitrate form.
Now the exactrix system claims to have better distributuion across shanks, and claim the benifit of lack of sinosoidal bands (N bulges) and i do believe that, but the cost of this system, vs. percieved benifits of lack of sinosoidal bands, is prohibitive. But, plenty of people have purchased smoke putt 'er in the ground 'ers, so what do i know!!!!
A pound of N is a pound of N. Always has always will. You major problems with NH3, that you can do something about are as follows.....
Depth..........Clay 3" this is a fact, this work was done in the 1960's and NH3 has not changed since then. Yes even MRB ammoina should be there
....................Sand 4" another fact, same as above. You want to do something to get more bang for your buck, go deeper.
Now a lot of guys are going to come back with the argument of.................blah blah blah, i do this and it works, and my machinery dealer said this....................blah blah blah. These depths are where it should be, but we keep getting shallower every year, and we are getting more losses than we know.
Soil condition.............Wet or dry, NH3 wants to go up inot the air, and if you cant close the furrow, you are going to lose some.
Bottom line, when fertilizer prices are high, someone always has a magic pill. Becareful, a 70K investment on some farms, can put you on the door of the poorhouse if you believe the hype.
As you can tell, i don't like these systems, I have read ALL of their literature and it is all HYPE!!! I have a very strong background in soil chemistry, and all i can tell you folks is there is no majic pill out there that will cure what ails you.