Results 111 to 120 of about 160,326 (161)

The agronomic effectiveness of reactive phosphate rocks 2. Effect of phosphate rock reactivity

Australian Journal of Experimental Agriculture, 1997
Summary. The chemical reactivity of apatite phosphate rock (PR) from Sechura (Bayovar), North Carolina, Egypt (Hamrawein), Morocco (Khouribja) and Queensland (Duchess), was estimated using the following methods (indices): percentage of the phosphorus (P) present in the PR that is soluble in one extraction with 2% citric acid and 2% formic acid, and ...
R. J. Gilkes, M. D. A. Bolland
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Screening for rock phosphate solubilizing Actinomycetes from Moroccan phosphate mines

Applied Soil Ecology, 2008
Three Moroccan phosphate mines, an original biotope rich in insoluble rock phosphate (RP), were explored for the presence of RP solubilizing Actinobacteria. Three hundred actinomycete isolates originating from these mines were tested for their ability to grow on a synthetic minimum medium (SMM) containing insoluble RP as unique phosphate source.
Hamdali, H., Bouizgarne, B., Hafidi, M., Lebrihi, A., M.J., Virolle, Ouhdouch, Y.   +5 more
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Phosphate rocks and phosphate rock/sulphur granules as fertilisers for hill country pasture

New Zealand Journal of Experimental Agriculture, 1986
Abstract Reactive phosphate rocks (PR) from North Carolina and Peru (Sechura), applied either as granules or after co-granulation with elemental sulphur (PR/S), were evaluated as phosphate fertilisers on a north-facing slope of a hill country pasture. Single superphosphate was used as the standard fertiliser. The fertilisers were applied annually for 3
S.S.S. Rajan, A.G. Gillingham
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Phosphate Rocks and Nuclear Proliferation

Science & Global Security, 2017
Phosphate rocks are predominantly mined for fertilizer production. However, they also contain considerable amounts of accompanying natural uranium that can exceed concentrations found at commercial...
Nils Haneklaus, Anastasiya Bayok, Vitaly Fedchenko   +2 more
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Uranium in phosphate rock

Open-File Report, 1975
Al Introduction 1 Guano and guano-derived deposits 1 Igneous apatite deposits 2 Marine phosphorite 2 Secondary deposits 3 Page Other deposits A4 Lake beds 4 Offshore deposits 4 Phosphate resources 5 Selected references ...
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Rock Phosphates in Agriculture

Experimental Agriculture, 1991
SUMMARYThe principles that control effectiveness of rock phosphates as fertilizer are now fairly well understood so that the potential effect of a material can be predicted with some confidence from laboratory analysis of the raw material. Soil characteristics, especially acidity, and calcium and phosphate status, are important: if these are not ...
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Leaching effect on phosphate rock

Journal of Radioanalytical and Nuclear Chemistry Letters, 1996
The uranium content in ground phosphate rock was leached out with alkaline solution, however, a poor yield was obtained. XRD, TGA and α-spectrometric analyses in the solid fraction showed that francolite is the main mineral in which uranium is present in different oxidation states (+4 and +6).
E. T. Romero-Guzmán, E. Ordoñez-Regil, V. H. Lara Corona   +2 more
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Radioactivity in phosphate rock

Economic Geology, 1966
Uranium content of sedimentary phosphates from different localities is proportional to total gamma activity, indicating that uranium is in radioactive equilibrium with its decay products.
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Phosphate rock processing

2023
Deepak Kumar, Dilip Kumar
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Rock Phosphate Studies with Neutron Irradiated Rock Phosphate

Soil Science Society of America Journal, 1950
Maurice Fried, Arnold J. MacKenzie
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