Results 111 to 120 of about 40,209 (161)
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Biotechnology Letters, 1992
Microbiological acid solutions produced byThiobacillus ferrooxidans andThiobacillus thiooxidans on pyritiferous concentrate were used to solubilize phosphate rock with a high grade in P2O5. Five different mixtures of pyritiferous concentrate and phosphate rock, in different proportions, were used in adequate liquid culture media.
A. C. A. Costa +2 more
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Microbiological acid solutions produced byThiobacillus ferrooxidans andThiobacillus thiooxidans on pyritiferous concentrate were used to solubilize phosphate rock with a high grade in P2O5. Five different mixtures of pyritiferous concentrate and phosphate rock, in different proportions, were used in adequate liquid culture media.
A. C. A. Costa +2 more
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The agronomic effectiveness of reactive phosphate rocks 2. Effect of phosphate rock reactivity
Australian Journal of Experimental Agriculture, 1998Summary. 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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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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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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Causes for the reduced reactivity of phosphate rock residues in partially acidulated phosphate rocks
Australian Journal of Soil Research, 1994The agronomic effectiveness of partially acidulated phosphate rock (PAPR) fertilizers depends on the proportion of water soluble P present and the long-term release of P from the unacidulated residual phosphate rock (water-insoluble residue) in the soil environment.
HJ Di +4 more
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Rock Phosphates in Agriculture
Experimental Agriculture, 1991SUMMARYThe 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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Phosphate rocks and phosphate rock/sulphur granules as fertilisers for hill country pasture
New Zealand Journal of Crop and Horticultural Science, 1986Abstract 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.
S.S.S. Rajan, A.G. Gillingham
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Phosphate rocks and partially-acidulated phosphate rocks as controlled release P fertilizers
Fertilizer Research, 1993Properties of phosphate rocks (PRs) and partially acidulated phosphate rocks (PAPRs) which affect the pattern of P dissolution and thus the potential for manipulating the rate of P release are reviewed. The effects of soil and plant properties are also considered.
J. Hagin, R. Harrison
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Radioactivity in phosphate rock
Economic Geology, 1966Uranium 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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Fertilizer Research, 1993
The initial and residual fertilizer effectiveness of North Carolina RP (rock phosphate), monocalcium phosphate and partially acidulated RP (made from North Carolina RP at 30% acidulation), both granulated and non-granulated, were measured in a glasshouse experiment.
Vijay Kumar +2 more
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The initial and residual fertilizer effectiveness of North Carolina RP (rock phosphate), monocalcium phosphate and partially acidulated RP (made from North Carolina RP at 30% acidulation), both granulated and non-granulated, were measured in a glasshouse experiment.
Vijay Kumar +2 more
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Communications in Soil Science and Plant Analysis, 1995
Abstract The agronomic effectiveness of Mussoorie phosphate rock (MPR) from India and a 2:1 mixture of MPR and single superphosphate (SSP) was compared against SSP as phosphate fertilizers for crops. The experiment was conducted for three seasons and was designed to study the response of crops to current application as well as residual effects of the ...
P. Singaram +2 more
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Abstract The agronomic effectiveness of Mussoorie phosphate rock (MPR) from India and a 2:1 mixture of MPR and single superphosphate (SSP) was compared against SSP as phosphate fertilizers for crops. The experiment was conducted for three seasons and was designed to study the response of crops to current application as well as residual effects of the ...
P. Singaram +2 more
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