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When you are going to apply urea to corn, don't do it before watching this video! Nitrogen fertilization is crucial for good corn production and it is very important to know the right time to apply it. First of all, it is important to apply it at the V4 stage of the corn right at the beginning, between the 15th and 20th day. Urea is the most commonly used source of nitrogen, but there are other fertilizers with the same purpose (ammonium sulfate) is also a good option.