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Effect of long-term, biennial, fall-applied anhydrous ammonia and nitrapyrin on soil nitrification



Effect of long-term, biennial, fall-applied anhydrous ammonia and nitrapyrin on soil nitrification



Soil Science Society of America journal 64(1): 228-234



Long-term dryland wheat plots were established in northwestern Utah and maintained for 8 yr in a 2-yr wheat-fallow rotation. Nitrapyrin [2-chloro-6-(trichloromethyl)pyrindine] was applied with anhydrous ammonia (NH3) in the fall preceding wheat growth to retard nitrification. Our objective was to determine the effects of long-term, biennial application of anhydrous NH3 with and without nitrapyrin on soil nitrification. We were particularly interested in the potential residual effects of the long-term repeated applications of anhydrous NH3 and nitrapyrin. Nitrification potentials were measured in control (no added N) soil, or soil fertilized with anhydrous NH3 with or without nitrapyrin for both rotation phases. Nitrification potentials were higher in soils receiving anhydrous NH3 than in the control soil during the cropped rotation. Nitrification potentials in soils receiving anhydrous NH3 with nitrapyrin were similar to those of the control soils during the entire wheat fallow rotation period. Further, nitrification potentials in soils with a history of nitrapyrin use were significantly lower in soils without nitrapyrin use when measured after 2 yr. We observed a transient increase in nitrification potentials with the application of anhydrous NH3 that did not last in the fallow year, suggesting the long-term, biennial application of anhydrous NH3 at a rate of 58 kg ha(-1) had no residual effect on soil nitrifier population size. In contrast, our results suggest that the long-term, biennial application of nitrapyrin did have a residual effect on soil nitrifier populations that lasted at least 2 yr.

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Accession: 003419086

Download citation: RISBibTeXText

DOI: 10.2136/sssaj2000.641228x


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