Prilled Urea 46% features 46% of nitrogen (N) in ureic form, simply absorbed because of the leaves of plants. Absorption through the basis system is slower, because urea in soil is converted (as a results of enzymatic hydrolysis) into the ammonia form available for plants, and afterwards into nitrate form. https://directory-farm.com/listings13593040/fibre-sisal-sumatra-an-overview