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Pakistan Journal of Biological Sciences

Year: 2002 | Volume: 5 | Issue: 11 | Page No.: 1277-1293
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Research Article

Factors Affecting the Efficiency of Symbiotic Nitrogen Fixation by Rhizobium

Abdullah M. K. Al-Falih

ABSTRACT

Recent reports pointed to a decline in agricultural dependence on symbiotic nitrogen fixation, and in the use of rhizobial inoculants. The aim of the present review was to study the environmental factors that affect the efficiency of symbiotic nitrogen fixation by Rhizobium in soil. These factors included pH, salinity, moisture, temperature, microorganisms, organic matter and soil texture. The overall conclusion is that symbiotic nitrogen fixation by Rhizobium is a critical biological process. Environmental stresses are generally the limiting factors of the symbiotic nitrogen fixation. With the selection of the appropriate legume and rhizobial inoculant, nitrogen fixation can be increased and concomitantly food production can be improved even under environmentally stressed conditions.
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