JEQ Journal of Natural Resources and Life Sciences Education
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Published in J Environ Qual 3:270-273 (1974)
© 1974 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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Changes in the Rhizosphere Effect of Millet Associated with Sprinkler Irrigation with Animal Wastes1

Frank B. Dazzo, Paul H. Smith and David H. Hubbell2

ABSTRACT

The microbial population changes in Scranton fine sand and adjacent millet rhizospheres resulting from sprinkler irrigation with cow manure slurry were investigated. Increasing the rate of irrigation with manure slurry resulted in a decline in the R/S ratio of ureolytic, proteolytic, amylolytic, and lipolytic microorganisms. A nutritional grouping study of the predominant bacteria indicated a significant increase in incidence of bacteria requiring amino acids and a decrease in incidence of bacteria requiring soil extract within non-rhizosphere soil receiving manure applications. These findings, in addition to observed declines in the R/S ratio of microorganisms within soil receiving waste, are taken as evidence that the microbial environment created by irrigating Scranton fine sand with animal waste slurry may become similar to the microbial environment created by the roots of millet.

Key Words: animal waste disposal • soil microbiology

NOTES

1 Florida Agricultural Experiment Station Journal Series No. 4795.

2 Graduate Research Assistant and Professor, Department of Microbiology, and Associate Professor, Department of Soil Science, University of Florida, Gainesville 32611. This study represents a portion of the senior author's Thesis presented to the Graduate Council in partial fulfillment for the Degree of Master of Science.

Received for publication September 14, 1973.




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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 © 1974 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.