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- Title
INTEGRATED METHODS FOR INCREASING P-SOLUBILITY OF PHOSPHATE ROCK.
- Authors
Hasan, Hamida S. H.; El Sherbieny, A. E. A.; Matter, M. K. E.; Fouda, Sara E. E.
- Abstract
Laboratory experiments were carried out to study the effect of some integrated factors on solubility of phosphate rock (PR) obtained from two locations which were Abou Tartour and El-Sibaia Gharb as well as tricalcium phosphate. PRs were crushed to pass through a 1.18-mm sieve and separated into 7 particle diameters of 500, 250, 212, 125,75 and 45 μm. Scanning Electron Microscope "SEM" and X- ray diffraction were done. P-solubility was assessed using water and 5 acids of formic (FR), Acetic (AC), tartaric (TR) oxalic (OX) and citric (CT) (each of 2%). P in Abou Tartour samples was mainly as calcium phosphate hydroxide “Ca5(PO4)6 OH. Other crystalline were silicon oxide SiO2, calcium carbonate CaCO3 and calcium di-hydrogen phosphate hydrate Ca H2PO4. P in El-Sibaia samples was mainly in form of Brushite. P contents (g kg-1) were 0.2 to 0.6 water-soluble, and 10 - 17 for Olsen extract. Ranges for the acid-extractants from the two PRs were 39-44 for CT, 25-41 for AC, 27-49 for TR, 14-28 for OX and 32-52 for FA. A tendency to increase with decreased particle size occurred. Practical aspects could be inferred regarding the use of PR for fertilization.
- Subjects
PHOSPHATE rock; CALCIUM phosphate; SCANNING electron microscopes; X-ray diffraction; PLANT fertilization
- Publication
Zagazig Journal of Agricultural Research, 2016, Vol 43, Issue 5, p1545
- ISSN
1110-0338
- Publication type
Article
- DOI
10.21608/zjar.2016.98105