HOW TO CONTROL NITROGEN FERTILIZERS LOSES

The major mechanisms for nitrogen fertilizer loss are denitrification, leaching and volatilization. Denitrification and leaching occur under very wet soil conditions, while volatilization is most common when soils are only moist and are drying.

Practices for Avoiding Nitrogen Fertilizer Losses

Using an NH4+ source of nitrogen acidifies the soil because the hydrogen ions (H+) released during nitrification of the NH4+ are the major cause of acidity in soils. Over time, acidification and lowering of soil pH can become significant.

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Nitrogen fertilizers containing NO3- but no NH4+ make the soil slightly less acidic over time, but are generally used in much lesser quantities than the others. The acidification due to NH4-nitrogen is a significant factor in the acidification of agricultural fields, but can easily be controlled by normal liming practices.

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