Oxygen isotope ratios of merrillite and chlorapatite in the Martian meteorites ALH84001 and Los Angeles have been measured by ion microprobe in multicollector mode. O values of phosphate minerals measured in situ range from 3 to 6‰, and are similar to Martian meteorite whole-rock values, as well as the O of igneous phosphate on Earth. These results suggest that the primary, abiotic, igneous pho...

In the last decades considerable attention has been given to naturally occurring radioactive material (NORM). Within this frame, of particular concern is the phosphate fertilizer industry. In Brazil, four main industries (Ultrafertil, Copebrás, Fosfertil and Bunge Fertilizantes) are responsible for the production of 1.2x10 6 tons per year of P2O5. Phosphogypsum is the by-product of the phosphor...

Aspergillus sp PS 104, a soil isolate had excellent potential to solubilize rock phosphate in vitro. The process was influenced by the presence of various concentrations of local loess (red soil). The simultaneous occurrence, in our experiment, of high levels of solubilized phosphate and synthesized citric acid, together with the lowest reached pH values, confirmed the role of citric acid in th...

Recent human population increase has been enabled by a massive expansion of global agricultural production. A key component of this "Green Revolution" has been application of inorganic fertilizers to produce and maintain high crop yields. However, the long-term sustainability of these practices is unclear given the eutrophying effects of fertilizer runoff as well as the reliance of fertilizer p...

Rock phosphates are less soluble and agronomically not as efficient the acidulated. However, some rhizobacteria can improve solubilization of inorganic in soil, raising efficiency rock phosphates. The objective was to evaluate development maize plants response application P sources associated with inoculation. A greenhouse experiment carried out six sources: no application; ​​Triple Superphosph...

Inhibition of Aspergillus niger phosphate solubilization by fluoride released from rock 1 phosphate 2 Running title: Inhibition of fungal P solubilization by fluoride 3 4 Gilberto de Oliveira Mendes, Nikolay Bojkov Vassilev, Victor Hugo Araújo Bonduki, 5 Ivo Ribeiro da Silva, José Ivo Ribeiro Júnior, Maurício Dutra Costa 6 7 a Department of Microbiology, Federal University of Viçosa, Brazil 8 b...