Water-facilitated dispersal of inoculant Bradyrhizobium japonicum in soils |
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Authors: | G A Breitenbeck H Yang E P Dunigan |
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Institution: | (1) Department of Agronomy, Louisiana Agricultural Research Station, Louisiana State University, Agricultural Center, 70803-2110 Baton Rouge, LA, USA;(2) Present address: Laboratory of Molecular Biology, Chinese Academy of Agricultural Science, Beijing, China |
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Abstract: | Summary Studies were performed to assess the influence of percolating water and an advancing wetting front on the transport of Bradyrhizobium japonicum in sand and silt loam soils, and to assess the influence of clay content on water-facilitated dispersal of these bacteria in a sand amended with various amounts of kaolin. The data obtained showed that movement of B. japonicum in soil was dependent upon water movement and that both percolating water and an advancing wetting front readily transported bacteria in coarse-textured soils. Percolation with the equivalent of 10 cm of rainfall dispersed B. japonicum throughout 40-cm columns containing sand and silt loam soils. Percolation with 5 cm of water was sufficient to disperse B. japonicum throughout 20-cm columns of these soils but did not transport these bacteria below the surface 4 cm of a sand amended with 12% kaolin. Our finding that cells of B. japonicum are readily transported by an advancing wetting front indicates that non-saturated flow of soil water contributes to dispersal of inoculum in soils. |
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Keywords: | Bacteria Rhizobia Transport Bradyrhizobium japonicum Water movement |
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