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Nitrification Inhibition in Soil: I. A Comparison of 2‐Chloro‐6‐(trichloromethyl)pyridine and Potassium Azide Formulated with Anhydrous Ammonia
Author(s) -
Parr J. F.,
Carroll B. R.,
Smith S.
Publication year - 1971
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1971.03615995003500030039x
Subject(s) - chemistry , nitrification , anhydrous , incubation , potassium , ammonium , pyridine , ammonia , medicinal chemistry , zoology , nuclear chemistry , nitrogen , agronomy , horticulture , biochemistry , organic chemistry , biology
The relative effectiveness of 2‐chloro‐6‐(trichloromethyl) pyridine and potassium azide as nitrification inhibitors, formulated and applied to soil with anhydrous NH 3 , was compared in laboratory and growth chamber experiments. At an inhibitor level of 10 ppm, and after 14 days, NH 4 + concentrations 0 to 2.5 cm from the point of release of NH 3 , NH 3 + KN 3 , and NH 3 + N‐Serve were 695, 810, and 887 ppm N respectively, while after 56 days corresponding values had decreased to 129, 316, and 609 ppm N. After 14 and 56 days of incubation in unplanted pots, KN 3 was 60 and 40%, respectively, as effective as N‐Serve in suppressing nitrification. N‐Serve was more effective than KN 3 during longer incubation periods because of its greater residual activity. In general, yields of ryegrass ( Lolium sp.) and cotton forage ( Gossypium hirsutum L.) followed the order of NH 3 = NH 3 + KN 3 > NH 3 + N‐Serve. The greater residual activity of N‐Serve compared with KN 3 and the absence of root development in the center of the NH 3 + N‐Serve retention zone, as well as the stunted and flaccid appearance of roots, was indicative of potential phytotoxicity of N‐Serve in this particular mode of application.