Where is nitrogen going in long-term cropping systems?
Date
2006-03-02
Authors
Selles, F.
Lemke, R.
Zentner, R.P.
Campbell, C.A.
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Abstract
Fertilizer nitrogen use efficiency (NUE) is normally low, and has led to the idea that a large proportion of N applied as fertilizer is lost from the soil. However, N balances calculated for a long-term rotation study at Swift Current indicate that losses of fertilizer N from the soil are small, and comparison of cumulative N balances with actual soil organic matter measurements show that an overwhelming proportion of this N is cycled through the organic matter, through microbially mediated processes, enhancing the fertility of the soil.
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fertilizer, nitrogen use efficiency, nitrogen balances, cropping systems
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Soils and Crops Workshop