Ability of nitrapyrin,dicyandiamide and acetylene to retard nitrification in a mineral and an organic soil |
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Authors: | K L Sahrawat D R Keeney S S Adams |
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Affiliation: | (1) Department of Soil Science, University of Wisconsin-Madison, 53706 Madison, WI, USA;(2) Present address: International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), ICRISAT, Patancheru P.O., 502324, A.P., India |
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Abstract: | Laboratory experiments were conducted to evaluate the efficacy of nitrapyrin, dicyandiamide (DCD) and acetylene (C2H2) as nitrification inhibitors in a silt loam and oragnic soil with and without added NH4. Nitrapyrin (8 μg/g soil) and DCD (20 μg/g soil) were very effective in retarding nitrification of NH4−N in the silt loam soil during 14 days of aerobic incubation at 30°C. However neither nitrapyrin, (20 μg/g soil) nor DCD
(20 or 100 μg/g soil) were effective in retarding NO3 production in the organic soil not amended with NH4. Dicyandiamide was moderately effective in retarding nitrification (39% inhibition) at 100 μg/g concentration but nitrapyrin
at 20 μg/g rate had little effect (8% inhibition) on nitrification in the organic soil amended with NH4. In a separate experiment C2H2 was a very effective inhibitor in both soils when present in the flask atmosphere at 0.1% or 1% (v/v). |
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Keywords: | nitrification inhibitors histosol |
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