Int. J. Biosci.10(1), 202-209, January 2017
This study was undertaken to deduce the supply of phosphorous-phosphates from low grade Rock phosphates in aquatic media and to ascertain the best pH range out of several pH ranges so as to apply this research further on fish growths in ponds environment. In this regard, an attempt was made to study the efficiency of phosphorus released from Rock Phosphate at various temperatures and various pH ranges, i.e., 6-7, 7-8 and 8-9.The experiments were conducted during winter and summer season for a 96 hourly and then five weeks duration period. The phosphorus released concentrations were measured spectrophotometrically by ascorbic acid method. The results incurred, from the summer as well as from the winter experiments, revealed a maximum release of phosphorus fromT4treatmentsindicating that the higher pH (alkaline) range: 8-9 increased the rate of phosphorus release from Rock phosphate. The phosphate ranged between 0.06 to 0.40 mgL−1values from all treatments during the study period with the highest at high temperature during summer season. Hence, Rock phosphate enriched soils could be an alternative and cheaper source of phosphorus fertilizer to utilize low-grade Rock phosphates efficiently for enhancing fish production for alkaline soils/ waters available all over the Punjab.
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