University of California

Effect of microbial activity on saturation extract composition


R. M. Carlson
Roy Overstreet
D. V. Naylor

Authors Affiliations

R. M. Carlson was Assistant Pomologist in the Experiment Station, Davis; Roy Overstreet (now deceased) was Professor of Soil Science and Chemist in the Experiment Station, Berkeley; D. V. Naylor was formerly Research Assistant, Department of Soils and Plant Nutrition, Berkeley, is Assistant Professor of Soils, University of Idaho.

Publication Information

Hilgardia 40(16):553-564. DOI:10.3733/hilg.v40n16p553. June 1971.

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Changes in saturation extract composition caused by microbial production of carbon dioxide were followed by collecting and analyzing fractions of the saturation extracts from Yolo fine sandy loam and eight salt-affected soils. Bicarbonate and cation concentrations increased in the extracts of all but one soil during the course of extraction. Addition of thymol to the soil paste at the time of preparation is recommended to reduce the effects of microbial activity on composition of the saturation extract.

Literature Cited

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Richards L. A. Filter funnels for soil extracts. Agron. Jour. 1949. 41:446 DOI: 10.2134/agronj1949.00021962004100090011x [CrossRef]

Richards L. A. (Ed.) Diagnosis and improvement of saline and alkali soils 1954. p.160. U. S. Dept. Agr. Handbook No. 60.

Stevenson I. L. Some observations on the microbial activity in remoistened air-dried soils. Plant and Soil. 1956. 8:170-82. DOI: 10.1007/BF01398818 [CrossRef]

Carlson R, Overstreet R, Naylor D. 1971. Effect of microbial activity on saturation extract composition. Hilgardia 40(16):553-564. DOI:10.3733/hilg.v40n16p553
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