Prilled Urea 46% contains 46% of nitrogen (N) in ureic form, simply absorbed with the leaves of plants. Absorption through the foundation system is slower, because urea in soil is converted (being a result of enzymatic hydrolysis) into the ammonia form available for plants, and then into nitrate form. four. https://preniumdirectory.com/listings13619668/black-turtle-beans-nz-an-overview