Prilled urea 46% contains 46% of nitrogen (N) in ureic form, quickly absorbed from the leaves of plants. Absorption through the root system is slower, because urea in soil is converted (being a result of enzymatic hydrolysis) into the ammonia form available for plants, and after that into nitrate form. https://pr1bookmarks.com/story20806078/rumored-buzz-on-should-you-drain-and-rinse-canned-black-beans