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This article in JEQ

  1. Vol. 3 No. 3, p. 270-273
    Received: Sept 14, 1973

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Changes in the Rhizosphere Effect of Millet Associated with Sprinkler Irrigation with Animal Wastes1

  1. Frank B. Dazzo,
  2. Paul H. Smith and
  3. David H. Hubbell2



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.

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