Prilled urea 46% features 46% of nitrogen (N) in ureic form, very easily absorbed by the leaves of plants. Absorption from the root system is slower, because urea in soil is converted (like a results of enzymatic hydrolysis) into the ammonia form available for plants, and afterwards into nitrate form. https://sitesrow.com/story10202956/npk-fertilizer-manufacturer-in-malaysia-fundamentals-explained