But ammonia plants also produce anhydrous ammonia,
ammonium nitrate (the compound that caused last week's explosion in Texas),
ammonium sulfate, UAN (urea
ammonium nitrate solution) and other forms
of ammonia used in agricultural and industrial
applications — none
of which use the leftover CO2.
Three soil management treatments were maintained throughout the experiment: an unamended control, a 10 - cm wood waste mulch treatment, and an annual fertigated
application of 20 g
of phosphorus (as
ammonium polyphosphate) per tree at full bloom.