Prilled urea 46% includes 46% of nitrogen (N) in ureic form, quickly absorbed by the leaves of plants. Absorption through the root system is slower, because urea in soil is converted (like a result of enzymatic hydrolysis) into the ammonia form available for plants, and after that into nitrate form. https://mypresspage.com/story5372442/borlotti-beans-nutrition-for-dummies