Important Limiting Factors For Nodulation of Alfalfa Roots in some Parts of Isfahan Province
2004
Yahya Abadi,Mojtaba | Khavazi,Kazem
Success or failure in legume establishment is dependent on chemical, physical and biotic influences and also field management. The objectives of this investigation were to evaluate the indigenous population and nodulation of Rhizobium meliloti and important limiting factors for nodulation of alfalfa roots in Isfahan, central Iran. Soil samples were taken from different fields of alfalfa in order to determine soil physico-chemical properties and numbers of R. meliloti based on Vincent (1982) method. The size of these populations depends on both environmental and soil factors and generally ranges from 1.5xl02 to 14.7xl03 cells of R. meliloti g-lsoil. A significantly higher numbers of R. meliloti was present in shahreza and Daran sites. The results also showed a significantly effect of soil potassium and soil phosphorus at p::::;O.Ol and soil bulk density at p::::;O.05 on the alfalfa nodulation score and soil rhizobia numbers. Reasons such as: undesirable environmental condition (temperature, water supply.), soil properties, dismanagement of alfalfa farms, several cutting and grazing and lack of suitable rhizobia in soils, have been considered as the factors limited alfalfa nodulation. Keywords: Rhizobium, alfalfa, soil, nodulation, management
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