The Feasibility of Using Unconventional Fertilizers on P Availability in Soil

Document Type : Original Article

Abstract

THE FEASIBILITY of using different untraditional P sources, i.e., compost, ground animal bones, ground fish bones and the rock phosphate together with phosphorin inoculants (P-dissolving bacteria) on improving P availability in soil is the aim of this study. The results show that the overall values of NaHCO3 extractable-P were significantly higher in the Typic Torripsamments soil treated with compost, besides the no-P-treatment (control soil ) compared with the other P sources, whereas P-extractability remained statistically unchanged in the sandy loam soil under all treatments. Thus unconventional P-sources seemed to bring P in soils of poor P content to new levels of equilibrium. The results also reveal that P-extractability increased in the sandy loam soil during the incubation period in the form of consecutive peaks, each peak represents a case of significant increases in P extractability in soil followed by sudden reductions in extractable-P. Soils treated with animal bones, rock phosphate and fish bones recorded the highest increases in extractable P, while these treatments recorded the lowest values of extractable P at the beginning as well as at the end of peak relationships. On the other hand, the extractability of P changed in the Typic Torripsamments soil during the incubation period in the form of a single peak.


The results confirm the importance of periodical inoculation of soil with phosphorin during the plant growth to improve P availability in soil and pointed up to the importance of rock phosphate, animal bones and fish bones as alternative sources for traditional or conventional fertilizers.

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History

  • Receive Date: 19 December 2012
  • Revise Date: 02 March 2013
  • Accept Date: 03 March 2013

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