|PRINT ISSN : 2319-7692
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Index Copernicus ICV 2015: 85.95
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A laboratory incubation experiment was conducted during 2013-14 in the post graduate research laboratory of the Department of Soils and Environment at Agricultural College and Research Institute, Madurai to characterize the predominant rice growing soils of Vadipatti block of Madurai district into low and high P availability and to study the phosphorus release pattern and inorganic fractions of phosphorus. The treatments were imposed based on the fertiliser recommendation viz., 150:50:50 Kg N, P2O5, K2O ha-1, Mussoorie rock phosphate @ 224 kg ha-1, farm yard manure @ 12.5 tonnes ha-1 and phosphate solubilizing bacteria (Lignite based phosphate solubilizing bacterium, Bacillus megateriumvar. Phosphaticum PSB-1) @ 2 kg ha-1 in a Completely Randomized Design (CRD). A significant improvement in available P status was noticed with inoculation of P solubilizing bacteria with Mussoorie Rock Phosphate in soils of low and high available P status and the distribution pattern of inorganic fractions at the pre and post incubation period in the soils followed the pattern of Fe-P >Al-P >Ca-P >Saloid-P > Red-P and decreased gradually during the course of incubation period irrespective of the fractions.