Ammonia volatilization from a flooded tropical soil

摘要: Ammonia volatilization, which follows upon the application of nitrogenous fertilizers to a flooded tropical soil, was directly measured in greenhouse and field. Most ammonia volatilization losses occurred during first 9 days after nitrogen application. increased markedly with increases soil pH. Nitrogen from ammonium sulfate applied soils whose pH values were below 7.5 very small. The urea much greater than those sulfate. Mixing fertilizer materials puddled reduced losses. larger dry drying duration magnitude volatilization. It is suggested that only small amount being lost through many lowland rice soils. re]19750820