2-Chloro-6-(Trichloromethyl) Pyridine as a Nitrification Inhibitor for Anhydrous Ammonia Applied in Different Seasons
1970
Hughes, T. D. | Welch, L. F.
Field experiments were conducted to study the effects of 2-chloro-6-(trichloromethyl) pyridine, N-Serve, on nitrification of anhydrous NH₃. Applications of 0, 0.56, and 1.12 kg N-Serve/ha in all possible combinations with 0, 112, and 224 kg N/ha were made on March 30, June 4, and November 25, 1968. Concentrations of NH₄⁺-N in the NH₃ retention zones were determined at various times following application. N-Serve decreased the rate of nitrification. Nitrification inhibition was evident at the first sampling (14 to 41 days from NH₃ application) and persisted until almost all NH₄⁺ had nitrified. N-Serve was inhibitory at all locations within the NH₃ retention zone. As an average of all application dates and N rates, there was 52% as much NH₄⁺ present at the first sampling with no N-Serve as with 1.12 kg/ha of N-Serve. There was 82% as much NH₄⁺ present at the first sampling with 0.56 kg/ha N-Serve as with 1.12 kg/ha N-Serve.
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