Effects of Inoculation of Phosphate Solubilizing Microorganisms on Increasing the Efficiency and Recovery Percent of Phosphate Fertilizers in Canola

Document Type : Research Paper

Authors

1 Graduate Student, Soil Science Department, Tarbiat Modares University, Tehran

2 Professor, Soil Science Department, Tarbiat Modares University, Tehran

3 Associate Professor, Soil and Water Research Institute, Karaj

Abstract

Phosphorus (P) is one of the most important nutrients in crop production. Large amounts of P applied as fertilizer enters into the immobile pools through precipitation reaction with Ca2+ in calcareous soils. In order to economically use the phosphate depositions accumulated in the calcareous agricultural soils and increase the efficiency of P-fertilizers in Iran, an experiment was carried out in the greenhouse of Agricultural College, Tarbiat Modares University, in 2011. The study had a Randomized Complete Block Design with 8 treatments and 4 replications. The experimental treatments were: T1) control, T2) Phosphate Solubilizing Microorganisms (PSM), T3) Triple Super Phosphate (TSP), T4) TSP+PSM, T5) Golden Bio Phosphate (GBP), T6) GBP+PSM, T7) Rock Phosphate (RP) and T8) RP+PSM. The results revealed that P uptake by canola inoculated with phosphate solubilizing microorganisms increased by 80.44 percent compared to the control treatment. There was a significant difference (p=5%) between inoculated treatments and the control. The highest P uptake was obtained in T4 (TSP+PSM) treatment, which was 84.57 mg pot-1.  Also, the highest amount of relative agronomic efficiency and recovery percent of fertilizer was obtained in T4 treatment, which was 109.29% and 71.91%, respectively. Inoculation with phosphate solubilizing microorganisms (PSM) significantly increased dry weight, pod numbers, P concentrations, P uptake, relative agronomic efficiency, and recovery percent of fertilizer in all treatments compared with the control pots. The overall results demonstrated that due to the higher price worldwide of P fertilizers and considering environmental issues, it is recommended that the experiment be further tested in the field.

Keywords

References

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Iranian Journal of Soil Research
Volume 27, Issue 4
March 2013
Pages 499-507

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