Prilled Urea 46% features 46% of nitrogen (N) in ureic form, conveniently absorbed because of the leaves of plants. Absorption through the foundation system is slower, because urea in soil is transformed (being a result of enzymatic hydrolysis) into the ammonia form available for plants, and then into nitrate form. https://morningdirectory.com/listings1146958/dap-fertilizer-msds-options