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Transport and survival of alginate-encapsulated and unencapsulated Pseudomonas aeruginosa UG2Lr through soil microcosms was examined. Bacterial cells encapsulated in alginate beads or mixed with soil were introduced into soil microcosms. Microbial cell survival and cell transport were monitored by destructive sampling and selective plating of the microcosms over a 9-week period. Survival rates were greatest when using encapsulated P. aeruginosa UG2Lr cells. Water flow increased microbial cell dispersal from the site of inoculation. After 3 weeks, encapsulated and free cells showed similar distribution patterns. However, after 9 weeks microbial cell distribution was more extensive throughout the soil in the encapsulated treatments under all conditions. Therefore, alginate encapsulation is a suitable method to enhance survival and distribution of microbial inocula in the soil environment.
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Hall et al. (1998) studied this question.
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