Efficiency of N-P Fertilizer Formulations and Ammonia Volatilization Losses from their Surface Application

The object of this study was to determine the relative efficiency of nitrogen and phosphorus uptake by plants from three new mixed fertilizer carriers developed by the Tennessee Valley Authority. This was accomplished by the use of a greenhouse experiment using oats as an indicator crop. An acid (Pawnee) soil and a calcareous (Crofton) soil relatively deficient in available nitrogen and phosphorus were used. Also five nitrogenous fertilizers were evaluated in a laboratory experiment as to ammonia loss from surface application of the nitrogen on acid (Sharpsburg), neutral (Holdrege), and calcareous (Crofton) soil having field capacity moisture conditions