Calculate the % of nitrogen in ammonium nitrate and urea which of the two fertilizers has maximum % of nitrogen.
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Various nitrogen fertilizers fit different needs.
A look at the nitrogen cycle helps understand the advantages and disadvantages of particular nitrogen fertilizer sources. For example, if nitrogen fertilizer is to be top-dressed and not incorporated, understanding the risk of nitrogen loss through volatilization is important. If sulfur is needed, then selecting ammonium sulfate to provide nitrogen and sulfur may be a good choice.
The cost per pound of nitrogen applied is also an important factor. Selecting a fertilizer with high nitrogen percentage and managing it appropriately may be a top priority. Please follow the 4R stewardship practices (right source, right rate, right placement and right timing) whenever possible as a guide to fertilizer decisions. Assistance is available from your local Michigan State University Extension educators. A few key points on the synthetic nitrogen fertilizers below are adapted from the International Plant Nutrient Institute fact sheets on the various fertilizers