Flooding and its influence on diazotroph populations and soil nitrogen levels in the Okavango Delta.

K. Omari, T. Mubyana, M.I. Matsheka, M.C. Bonyongo, E.M. Veenendaal

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Abstract

Effects of flooding on soil nitrogen (N), and asymbiotic nitrogen fixing bacterial (diazotroph) populations of the Okavango Delta were investigated. Diazotrophs from the rhizosphere of dominant annual and perennial grasses of the Okavango Delta were isolated on N-free composite media and identified applying morphological and biochemical criteria and Restriction Fragment Length Polymorphism (RFLP). Azotobacter species were found associated mostly with the grasses Andropogon guyanus and Vetevaria nigritiana (103CFU g¿1 rhizosphere soil). Annual grasses such as Eragrostis inamoena, Setaria sphacelata as well as perennials showed insignificant populations (
Original languageEnglish
Pages (from-to)734-740
JournalSouth African Journal of Botany
Volume70
Issue number5
DOIs
Publication statusPublished - 2004

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