Influence of iron pyrites and dicyandiamide on nitrification and ammonia volatilization from urea applied to loess brown earths (luvisols) |
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Authors: | D Blaise A Amberger S von Tucher |
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Institution: | (1) Institute of Plant Nutrition, Technical University Munich-Weihenstephan, D-85350 Freising, Germany, DE |
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Abstract: | Laboratory incubation study showed that iron pyrites retarded nitrification of urea-derived ammonium (NH4
+), the effect being greatest at the highest level (10000 mg kg–1 soil). Nitrification inhibition with 10000 mg pyrite kg–1 soil, at the end of 30 days, was 40.3% compared to 55.9% for dicyandiamide (DCD). The inhibitory effect with lower rates
of pyrite (100–500 mg kg–1) lasted only up to 9 days. Urea+pyrite treatment was also found to have higher exchangeable NH4
+-N compared to urea alone. DCD-amended soils had the highest NH4
+-N content throughout. Pyrite-treated soils had about 7–86% lower ammonia volatilization losses than urea alone. Total NH3 loss was the most with urea+DCD (7.9% of applied N), about 9% more than with urea alone.
Received: 11 November 1995 |
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Keywords: | Ammonia volatilization Denitrification Dicyandiamide Iron pyrites Luvisols Nitrification Urea |
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