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This article in AJ

  1. Vol. 75 No. 6, p. 947-950
     
    Received: June 28, 1982
    Published: Nov, 1983


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doi:10.2134/agronj1983.00021962007500060021x

Effect of Nitrapyrin on Nitrogen Transformations in Soil Treated with Liquid Swine Manure1

  1. R. A. McCormick,
  2. D. W. Nelson,
  3. A. L. Sutton and
  4. D. M. Huber2

Abstract

Abstract

Applications of animal manure to soil result in nitrification of applied NH+4 — N and eventual loss of applied N through leaching and/or denitrification processes. In theory, one way to reduce the leaching and/or denitrification losses is through the use of a nitrification inhibitor. Therefore, a field experiment was conducted during the summer of 1979 to determine the effects of nitrapyrin [2-chloro-6(trichloromethyl)pyridine] on N transformations occurring within a band of soil-applied liquid swine manure (LSM). Liquid swine manure (60 t ha −1) containing 0 or 50 mg nitrapyrin active ingredient/liter was injected into Chalmers silty clay loam (fine-silty, mixed, mesic Typic Haplaquoll). The LSM application provided about 156 kg ha −1 of plant-available N and nitrapyrin addition rates were 0 and 3 kg ha.−1 Periodically during the 24-week experiment soil samples were obtained from the LSM application band and analyzed for NH+4 — and NO3 — N. From 40 to 50% of added organic N was mineralized in the LSM application bands. Ammonium present in bands of LSM not treated with nitrapyrin was oxidized to nitrate within 7 weeks after application. Addition of nitrapyrin to the LSM delayed nitrification for up to 15 weeks after application. Essentially all of the inorganic N had been lost from the LSM that did not receive nitrapyrin by the 11th week after application, probably as a result of sequential nitrification and denitrification. However, in the nitrapyrin-treated LSM high amounts of inorganic N remained during the entire experiment and greater than 50% of the inorganic N initially present was recovered after 24 weeks. These findings suggest that nitrapyrin was effective in inhibiting nitrification in manure-treated soil and addition of the inhibitor reduced N losses following manure application.

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