How to Use Urea
When urea is placed on the surface of the soil, a chemical reaction takes place that changes the urea to ammonium bicarbonate. The ammonium will convert into a gas, which is then lost if not protected. This means that urea should be mixed in with the soil for maximum effectiveness. This may be done either by broadcasting the urea then plowing it into the soil immediately or by injecting the urea into the soil. This may also be done by broadcasting urea then irrigating heavily to push dissolved urea into the soil.
Advantages of Urea
In general, urea will provide the most nitrogen at the lowest cost. It is easy to store and does not pose as a fire risk for long-term storage. Urea may be mixed with other fertilizers or may be applied on its own. For plants that love acidic soils, urea is one of the top fertilizers for acidifying soils. For gardeners who grow crops like corn, strawberries, blueberries and other heavy nitrogen feeders, urea will supply immediate and powerful applications of nitrogen.

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