JEQ Journal of Natural Resources and Life Sciences Education
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Published in J Environ Qual 4:99-102 (1975)
© 1975 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Nitrate Reduction and Associated Microbial Populations in a Ponded Hanford Sandy Loam1

M. G. Volz, L. W. Belser, M. S. Ardakani and A. D. McLaren2

ABSTRACT

A field plot of Hanford sandy loam was ponded for 2 weeks with a solution of KNO3 and Ca(NO3)2 containing 100 ppm NO3-N in order to measure short term denitrification rates as well as growth and distribution of bacteria capable of reducing nitrate to nitrite and/or N2O and N2.

Denitrifying bacteria (101–2.9 x 104/g soil) generally decreased in number with depth and time and were not as numerous as nitrate reducers (101–6.9 x 105/g soil).

In the top 60 cm of soil, the concentration of NO2–-N in soil solution corresponded to minima in NO3–-N, suggesting that NO3– reduction gave rise to the NO2–. Denitrification rates calculated for the top 16 cm of water-saturated soil were estimated to range from 0.013 to 0.046 µg N/hour g–1. The highest value was about 80% of that measured in a laboratory soil column studied previously. This difference in denitrification rates may be due to lower soil carbon content in the field.

Key Words: denitrifiers • ammonium oxidizers • nitrite oxidizers • microbial ecology

NOTES

1 Contribution from the College of Natural Resources, University of California, Berkeley. Supported by NSF-RANN Grant No. GI 34733X, Nitrate in effluents from irrigated lands, and the Kearney Foundation of Soil Science.

2 Assistant Research Biochemist, Staff Research Associate, Assistant Research Chemist, and Professor of Soil Biology, respectively, Dept. of Soils & Plant Nutrition, Univ. of Calif., Berkeley, 94720.

Received for publication March 13, 1974.




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 1975 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.