INTEGRATED METHODS FOR INCREASING P-SOLUBILITY OF PHOSPHATE ROCK | ||||
| Zagazig Journal of Agricultural Research | ||||
| Article 6, Volume 43, Issue 5, September 2016, Page 1545-1560 PDF (1.08 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/zjar.2016.98105 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Hamida S.H. Hasan  ; A. E.A. El Sherbieny; M. K.E. Matter; Sara E.E. Fouda
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| Soil Sci. Dept., Fac. Agric., Zagazig Univ., Egypt | ||||
| 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. | ||||
| Keywords | ||||
| Phosphate rock; P solubility; x-ray of P-rocks; scanning electron microscopy | ||||
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