The rhizosphere microflora of wheat grown under controlled conditions I. The effect of soil fertility and urea leaf treatment on the rhizoplane microflora |
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Authors: | J W L van Vuurde |
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Institution: | (1) Phytopathological Laboratory, ‘Willie Commelin Scholten’, Baarn, The Netherlands |
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Abstract: | Summary Microbial colonization of seminal roots of seedlings and of nodal roots of tillering plants was studied on spring wheat ‘Kaspar’
cultivated in growth, chambers. Methods were developed to microbially condition the soil before seeding and to regulate soil
humidity.
Addition of inorganic nutrients (NPK) to the soil increased the number of rhizoplane bacteria and actinomycetes, but did not
effect the number of fungi on seminal and nodal roots.
Urea leaf treatments stimulated bacteria and actinomycetes 7 and 9 days after treatment. Fourteen days after urea leaf treatment,
however, bacterial numbers were mostly reduced, especially on seminal roots, while numbers of actinomycetes generally equalled
the control. Root types and soil fertility did not obviously interact with the effect of urea leaf treatment on rhizoplane
bacteria and actinomycetes. The only effect of urea on total numbers of fungi, was a reduction of their numbers on seminal
roots 9 days after treatment at both NPK-levels. |
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Keywords: | |
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