Prilled Urea 46% consists of 46% of nitrogen (N) in ureic form, quickly absorbed with the leaves of plants. Absorption through the foundation system is slower, because urea in soil is converted (being a results of enzymatic hydrolysis) into the ammonia form available for plants, and afterwards into nitrate form. https://paxtoncbrbj.wikipresses.com/7498882/a_review_of_npk_fertilizer_video