Urea is an agricultural by-product that is widely used in fertilizers, as a soil additive, and in the production of explosives.Urea can also be used as a plant fertilizer or added to compost. Urea is high in nitrogen, one of the three essential nutrientsfor plants.Urea is commonly used as a nitrogen-rich fertilizer. It can be applied to the soil, mixed with other fertilizers, or added to compost. Urea has a high nitrogen content and is relatively inexpensive. It is also relatively safe to handle and Store.