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A new group of nitrogen-fixing Azospirillum sp. bacteria was isolated from the roots of the C4-gramineous plant Miscanthus. Polyphasic taxonomy was performed, including auxanography using API galleries, physiological tests and 16S rRNA sequence comparison. The ability of the isolates to fix dinitrogen was evaluated by amplification of the nifD gene,(More)
To identify endophytic bacteria in Brazilian cacti, and to evaluate the effects of those bacteria on the growth of Cereus jamacaru seedlings and phosphate solubilization in vitro. Samples of roots and stems of C. jamacaru and Melocactus zehntneri were collected from the Aiuaba ecological Station in Brazilian semi-arid region. Bacterial isolates were(More)
The southeastern part of the Amazon region is one of the largest agricultural frontiers in the world, leading to extensive land-use change. This paper provides evidence for the impacts of land-use change on soil organic carbon (OC) stocks along a large scale for Ferralsols and Acrisols including subsoil. We took soil samples to 100 cm depth for native(More)
The purpose of this study was to evaluate the diversity of herbaceous plants and arbuscular mycorrhizal fungi following the cultivation of sunflower (Helianthus annuus L., cv. BRS 321) irrigated with produced water. The sunflower plants were irrigated during three successive cycles with different types of water: produced water obtained through simple(More)
The objective of this study was to quantify sediment production from drag, and the loss of organic matter and nutrients as a result of surface runoff in agro-ecosystems of the Brazilian semiarid region. Four watersheds were selected; all located in Iguatu, Ceará state, and characterized by native Caatinga vegetation (MN), thinned vegetation (MR), pasture(More)
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