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Statistical Evaluation of the Rhizosphere Effect
Author(s) -
Rouatt J. W.,
Katznelson H.,
Payne T. M. B.
Publication year - 1960
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1960.03615995002400040017x
Subject(s) - rhizosphere , decomposer , azotobacter , bacteria , biology , agronomy , botany , anaerobic bacteria , ecology , genetics , ecosystem
The paired t‐test was used to analyze the results of a microbiological study of soil on the surface of plant roots and soil apart from the roots. The increase in the numbers of bacteria, actinomycetes, fungi and protozoa in the rhizosphere soil of wheat was highly significant as was the increased incidence of ammonifying and denitrifying bacteria and “radiobacter” types. Anaerobes and aerobic cellulose decomposers were also more abundant on the root surface but not algae, anaerobic cellulose decomposers, spore formers or Azotobacter . Essentially similar results were obtained with barley and soybean plants. The preferential stimulation in the rhizosphere of bacteria requiring amino acids for optimal growth and the relative decrease in the proportion of those requiring factors in yeast and soil extracts were found to be highly significant with the three crops studied. However, the absolute numbers of both these groups of bacteria are higher in the rhizosphere soil.