Prilled Urea 46% includes 46% of nitrogen (N) in ureic form, simply absorbed by the leaves of plants. Absorption through the foundation system is slower, because urea in soil is transformed (to be a results of enzymatic hydrolysis) into the ammonia form available for plants, and then into nitrate form. https://dapfertilizeradvantagesan24765.wikijournalist.com/367141/npk_fertilizer_with_6_6_6_or_10_10_10_options