Predicting Unsaturated Zone Nitrogen Mass Balances in Agricultural Settings of the United States.

The article presents a study on the amount of unsaturated zone nitrogen mass balances present in the U.S. contrasting sites. It states that the study aims to describe the unsaturated zones overall predominant N cycling pathways and uses the unsaturated zone data for Root Zone Water Quality Model (RZWQM2) calibration. It mentions that the RZWQM2 version 1.8 was used to simulate water, bromide fluxes and N while soil hydraulic optimization and N transformation parameters were measured by PEST parameter estimation software. The results show that inorganic fertilizer and N fixation have the largest contribution of N in the agricultural settings.