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  • Title: Increased acidification in the rhizosphere of cactus seedlings induced by Azospirillum brasilense.
    Author: Carrillo AE, Li CY, Bashan Y.
    Journal: Naturwissenschaften; 2002 Sep; 89(9):428-32. PubMed ID: 12435098.
    Abstract:
    Acidification of the rhizosphere of cactus seedlings (giant cardon, Pachycereus pringlei) after inoculation with the plant growth-promoting bacterium Azospirillum brasilense Cd, in the presence or absence of ammonium and nitrate, was studied to understand how to increase growth of cardon seedlings in poor desert soils. While ammonium enhanced rhizosphere and liquid culture acidification, inoculation with the bacteria enhanced it further. On the other hand, nitrate increased pH of the rhizosphere, but combined with the bacterial inoculation, increase in pH was significantly smaller. Bacterial inoculation with ammonium enhanced plant growth.
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