Effect of Several Controlled/Slow-Release Fertilizers on Decreasing Ammonia Volatilization and N Leaching

Static absorption and soil column leaching methods were used to study ammonia volatilization and N leaching characteristics from six controlled/slowrelease fertilizers.The results showed that all the controlled/slow-release fertilizers decreased ammonia volatilization and N leaching in varying degrees.Total ammonia volatilization of six controlled-release fertilizers decreased by 16.62%,23.78%,32.15%,0.11%,16.59% and 37.78% than common urea respectively,and N leaching amount of the fertilizers decreased by 15.84%,38.27%,68.87%,46.17%,52.51% and 62.01% than common urea respectively.The results also indicated that ammonia volatilization from controlled/slow-release fertilizers was closely related to soil urease activity and pH value.