Interactive effects of soil amendments (biochar and gypsum) and salinity on ammonia volatilization in coastal saline soil

Ammonia (NH3) volatilization is a major route of nitrogen (N) loss from soil, especially in saline soil. Biochar and gypsum are two important soil amendments that are widely used in coastal saline farmland. However, little is known about the interactive effects of soil amendments and salinity on NH3 volatilization. In this study, five soil salinity levels, three N sources (urea, monoammonium phosphate (MAP), and manure) and two soil amendments...