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Effect of nitrapyrin on nitrous oxide emission from fallow soils fertilized with anhydrous ammonia



Effect of nitrapyrin on nitrous oxide emission from fallow soils fertilized with anhydrous ammonia



Fertilizer Research 5(4): 411-422



N2O emission from 3 soils was measured using a chamber technique. Treatments sampled were unfertilized soil, and soil fertilized with 60 or 80 kg N ha-1 of band-applied anhydrous ammonia .+-. nitrapyrin. The flux of N2O from unfertilizer soil was very low (1.1 to 1.6 g N ha-1 day-1). Application of anhydrous ammonia caused a significant increase in the cumulative emission of N2O in 2 soils over 27 or 29 days compared with unfertilizer soil. Fertilizer-induced loss of N2O was highest in a calcareous clay soil which had the highest nitrification rate and accumulated the highest concentration of NO2 within the fertilizer bands. Fertilizer-induced losses of N2O were < 0.05% of the applied fertilizer. Addition of nitrapyrin inhibited nitrification in all soils and reduced NO2 accumulation in the fertilizer bands. Nitrapyrin addition significantly reduced fertilizer-induced loss of NO2 only in the calcareous clay soil. In the other soil, nitrapyrin had a lower bioactivity (relative inhibition of nitrification) which may have been due to its higher organic matter content.

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Accession: 001346908

Download citation: RISBibTeXText

DOI: 10.1007/bf01049121


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