Prilled urea forty six% contains 46% of nitrogen (N) in ureic form, quickly absorbed via the leaves of plants. Absorption with 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://eduardourczu.shotblogs.com/5-easy-facts-about-npk-fertilizer-aquarium-described-51061435