HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Sabey, B. R. Search for Related Content PubMed Articles by Sabey, B. R. Agricola Articles by Sabey, B. R.

The Influence of Nitrification Suppressants on the Rate of Ammonium Oxidation in Midwestern USA Field Soils¹

ABSTRACT

The effectiveness of 2-chloro-6-(trichloromethyl) pyridine, 2-amino 4-chloro 6-methyl pyrimidine, and a resinous polymer coating in suppressing nitrification in the field was studied. Soil samples treated with (NH₄)₂SO₄ alone and with (NH₄)₂SO₄ plus the above materials, were placed in plastic bags and buried in field plots and allowed to incubate during the fall, winter and spring periods. Determinations for NH₄⁺-N and NO₃^--N were made throughout the incubations.

Nitrate-N accumulation occurred at rates as high as 2.5 ppm/day prior to April 15 in samples treated with (NH₄)₂SO₄ alone. Samples treated with the resinous coated (NH₄)₂SO₄ fertilizer had higher NO₃^--N accumulation rates (up to 4.1 ppm NO₃^--N/day), whereas samples treated with (NH₄)₂SO₄ and 2-chloro-6-(trichloromethyl) pyridine or 2-amino 4-chloro 6-methyl pyrimidine had rates of nitrification only as high as 2.3 and 1.6 ppm NO₃^--N/day, respectively, prior to April 15. Although 2-amino 4-chloro 6-methyl pyrimidine appeared slightly more effective after the end of April than 2-chloro-6-(trichloromethyl) pyridine in suppresing nitrification, there were relatively small differences. Both compounds, added according to recommended rates delayed rapid nitrification for about 1 month.

¹ Contribution from the Dept. of Agronomy, Univ. of Illinois, Urbana.

² Associate Professor of Soil Microbiology.

Received for publication February 13, 1968. Accepted for publication May 24, 1968.