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Table 5 Effect of PR rates on P solubilization efficiency after four weeks incubation

From: Importance of phosphate pock application for sustaining agricultural production in Egypt

Rate, g/100 g soil Sebaiya PR Red Sea PR Abu Tartur PR Triple SP
  Clay soil
0.05 17 11.2 13.2 13.1
0.1 13.6 13 15.5 14.1
0.2 9.18 16.4 16.6 25.7
0.3 13.5 14.1 26.2 12.3
  Calcareous soil
0.05 6 12.3 6.7 12.3
0.1 12.4 3.6 7.2 10.1
0.2 14.1 4 10.2 14.1
0.3 11.8 7.5 8.5 24
  Sandy soil
0.05 30.8 29.8 31.7 41
0.1 32.5 23.6 27 44.2
0.2 37 44.5 49.6 76.3
0.3 25.4 27 37.9 28