Objectives 1. To develop a method for the measurement of mass flow of anhydrous ammonia fluid. 2. To determine the level of variability in output from the outlets of application rigs using either the "gas", "cold fl.o" or "liquid" processes (stage 2). 3. If indicated by stage 2 that the level of variability is unacceptable, modify/develop the application rig to ensure even distribution of N. 1bis may include the development of a device for the continuous monitoring of the flow and distribution of anhydrous ammonia during application in the field (stage 3).