The effect of phosphate solubilizing bacteria and organic manure on solubilization of phosphate rock and cotton productivity

A field experiment was carried out during 2003 and 2004 in Edleb governorate to study the effect of phosphate solubilizing bacteria (Bacillus megaterium) and cows manure on solubilization of phosphate rock, cotton productivity, and phosphate uptake. The amounts of phosphate rock and superphosphate were added by the same amount of P2O5. An amount of nitrogen fertilizer as urea, was added to treatment 1, 2, 3, 4, 5, and 6 , whereas treatment 7, 8, 9, 10, 11, and 12 received amounts of organic fertilizer having the same amount of N added to treatment 1-6 (MAAR recommendation).