Use Of Specific N2 Fixing Genotypes As Crop Inoculants:
Progress Made And Potential For Stressful Soil Environments
Author(s)
S. Cummings & M. Andrews
Abstract
Use of specific N2 fixing genotypes as crop
inoculants: progress made and potential for
stressful soil environments
S. Cummings & M. Andrews
The School of Sciences, University of Sunderland, Sunderland, UK
Abstract
Unlike N fertiliser, inoculation of crops with diazotrophic bacteria does not
reliably increase crop yield. Inoculants added to plants are often ineffective due
to an inappropriate mechanism of action that does not add substantial nitrogen to
the system, low viability of the inoculant or poor persistence of the bacteria in
the soil. In this paper we identify the major problems of using inoculants, and
dicuss how improved effectiveness may be achieved by selecting strains of
bacteria capable of tolerating soil stresses while effectively fixing nitrogen. The
key elements of an effective inoculant are identified, as a mechanism that
increases plant available nitrogen, a high quality inoculant appropriate to the
crop cultivar being grown and an inoculant which is competitive and robust
Keywords
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