In Mississippi, supply seems to be tight at the moment. Farmers should lock in a reliable supply as soon as possible as availability may be more of an issue than prices. Pricing is quite volatile at the moment. It was very difficult to get an urea quote on the record. Fertilizer Rate Issues MSU-ES nitrogen recommendations are based on yield potential and soil type.
Some soils are more efficient in utilizing nitrogen fertilizers than others.
Efficiency of particular fertilizer materials depends on management factors such as application method and timing. These should be considered when contemplating switching nitrogen sources. It is convenient to compare the costs of each pound of nitrogen in the material in order to compare sources. The basic recommendation is 1.3 pounds of actual N per bushel of attainable, reasonable yield goal up to 100 bushels, then an additional 1.7 pounds of N for each reasonable, attainable bushel of yield goal over 100. Animal manures also may be used in the fertility program where they are available.