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Published in Soil Sci Soc Am J 22:311-314 (1958)
© 1958 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Soil Aggregation by Microorganisms Following Soil Fumigation1

T. M. McCalla, F. A. Haskins and R. D. Curley2

ABSTRACT

The influence of autoclaving and of fumigation with eight chemical formulations upon microbial numbers in straw-amended Peorian loess and the extent to which these treatments affect the degree of aggregation brought about by subsequently introduced inocula were determined. A mixed soil flora, Stachybotrys atra and a blank inoculum consisting of sterile salt solution, were compared. Only in the autoclaved soil was a mixed soil flora inoculum consistently superior to the blank inoculum in promoting aggregation of the Peorian loess. It was found that inoculation with S. atra could greatly increase the aggregation of fumigated Peorian loess in treatments where the fumigation was effective in reducing microbial numbers to a low level, and where the fumigant exerted little if any residual toxic effect upon the S. atra inoculum. Most promising of the fumigants tested were chloropicrin and Telone. The aggregation brought about by inoculation with S. atra in Peorian loess fumigated by appropriate amounts of either of these chemicals was approximately two-thirds as high as that produced by the same organism following autoclaving of the soil material.

NOTES

1 Contribution by the Soil & Water Conservation Research Division, ARS, USDA, and the Department of Agronomy, Nebraska Agr. Exp. Sta., Lincoln, cooperating. Published with the approval of the Director as Paper No. 851, Journal Series, Nebraska Agr. Exp. Sta. Presented before Div. III, Soil Science Society of America, Nov. 20, 1957, at Atlanta, Ga.

2 Bacteriologist, Soil & Water Conservation Research Division, ARS, USDA; and Associate Professor of Agronomy and former Graduate Student, Univ. of Nebraska, respectively.

Received for publication December 12, 1957. Accepted for publication April 8, 1958.






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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1958 by the Soil Science Society of America.