Prilled urea 46% contains 46% of nitrogen (N) in ureic form, simply absorbed through the leaves of plants. Absorption in the root system is slower, because urea in soil is converted (being a results of enzymatic hydrolysis) into the ammonia form available for plants, then into nitrate form. Insert to https://bookmarksden.com/story20457527/5-easy-facts-about-npk-fertilizer-aquarium-described