Prilled urea 46% contains 46% of nitrogen (N) in ureic form, very easily absorbed with the leaves of plants. Absorption from the root system is slower, because urea in soil is converted (as being a result of enzymatic hydrolysis) into the ammonia form available for plants, then into nitrate form. https://socialbuzztoday.com/story5749299/npk-fertilizer-manufacturer-in-malaysia-fundamentals-explained