Production Blog
Dan Davidson DTN Contributing Agronomist
Fri Dec 3, 2010 11:14 AM CST

The single biggest cause of hypoxia in the Gulf is nitrate coming out the tile lines and entering surface watersheds. And the single biggest contributor to that discharge is fall applied ammonia.

When ammonia is applied in the fall, even when soil temperatures drop below 50 F or NServe is used, will still convert to nitrate at a slow pace over the winter. Nitrification continues, albeit slowly until the soil freezes. And slowly nitrate begins to accumulate in the soil over the winter. Some of that nitrate will be residual from the previous season, some mineralized from organic matter and some ...

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