Abstract
The rational use of fertilizers, especially nitrogen in search of productivity growth, has been gaining increasing importance in activities related to Brazilian agriculture. However, for this goal is reached, it is necessary a more comprehensive understanding of the various factors affecting the efficient use of fertilizer. In turn the areas used for agricultural cultivation worldwide fertilizers contain too much or less. And the two extremes imply high costs for both the environment and man himself. One of the most limiting nutrient for crop production is nitrogen (N). Some poor people are starving in the world simply because there is a sufficient amount of N to adequately feed their crops. On the other hand, in certain regions of our planet, there is an excess of N. That is, this nutrient is supplied to crops in a much larger amount than necessary. In these situations, the N becomes a pollutant because its presence in excess triggers a series of reactions and processes that are extremely harmful to the environment and thus the health of populations. In order to understand the dynamics of N and how it can become pollutants carried to the present work.
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