The rhizosphere microflora of wheat grown under controlled conditions II. Influence of the stage of growth of the plant,soil fertility and leaf treatment with urea on the rhizosphere soil microflora |
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Authors: | J W L van Vuurde A De Lange |
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Institution: | (1) Phytopathological Laboratory, ‘Willie Commelin Scholten’, Baarn, The Netherlands |
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Abstract: | Summary The rhizosphere effect of seminal roots of seedlings and of nodal roots of tillering plants of spring wheat ‘Kaspar’ was investigated
under controlled conditions. The total number of micro-organisms recorded in the rhizosphere soil were significantly higher
than for the non-rooted soil when investigated with the soil dilution plate method, but lower when fluorescence microscopy
was used. Additions of inorganic fertilizer (NPK) decreased their numbers especially in rhizosphere soil of seminal roots
and in non-rhizosphere soil, but did not change the ratio between bacteria and actinomycetes (B/A). In the rhizosphere soil
the B/A ratio was higher than in the non-rhizosphere soil. An effect of urea leaf treatment was found with the dilution-plate
method only in the rhizosphere soil of nodal roots, 3 to 7 days after the first treatment. Increased numbers of actinomycetes
were found in this period in NPK fertilized soil, whereas increased numbers of bacteria were found at both fertility levels. |
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