Nitrogen is an essential nutrient for numerous plant functions and is one of the elemental components of chlorophyl. Urea, a white crystalline solid containing 46% nitrogen, is widely used in the agricultural industry as an animal feed additive and fertilizer Here we discuss it only as a nitrogen fertilizer. Urea can be applied to soil as a solid or solution or to certain crops as a foliar spray. Urea manufacture releases few pollutants to the environment. Urea, when properly applied, results in crop yield increases equal to other forms of nitrogen.
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