Volatilization of ammonia from the spent anolyte by heating ( simulating distillation ), and re-addition of this ammonia to the spent catholyte chamber with subsequent operation of this chamber as the anode ( to regenerate copper on the other electrode ), produced a maximum power density of 60 ?3 W m " 2, with an average discharge energy efficiency of 29 % ( electrical energy captured " versus " chemical energy in the starting solutions ).
42.
Some important factors that need to be considered when managing nutrients include ( a ) the application of nutrients considering the achievable optimum yields and, in some cases, crop quality; ( b ) the management, application, and timing of nutrients using a budget based on all sources and sinks active at the site; and ( c ) the management of soil, water, and crop to minimize the off-site transport of nutrients from nutrient leaching out of the root zone, surface runoff, and volatilization ( or other gas exchanges ).
