From Havlin, Beaton, Tisdale and
The simplest N solution is aqua NH3, which is made by
forcing compressed NH3 gas into water. It has a pressure of
less than 10 lb/in2. and usually is composed of 25 to 29% NH3
Transportation and delivery costs limit
aqua NH3 production to small, local fluid fertilizer plants.
Aqua NH3 is used for direct soil applications or to produce
other liquid fertilizers. The NH3 will volatilize quickly at
temperatures above 50F; thus, aqua NH3 is usually injected
into soil to depths of 2 to 4 in. At temperatures over 50F, surface
applications of aqua NH3 should be immediately incorporated
into the soil.