The ability of fluorescent pseudomonads to increase Bioavailability of phosphorous in soil and study of some formulation from superior isolates

Document Type : Research Paper

Authors

1 Associate professor, Vali-e-Asr University of Rafsanjan

2 Former MSc. student of Vali-e-Asr University of Rafsanjan

3 Assistant professor, Vali-e-Asr University of Rafsanjan

Abstract

Phosphorus is one of the essential elements for plant growth and increase in the availability of indigenous phosphorus have an effective role in reducing the chemical fertilizers consumption. This study was conducted to investigate some inoculant formulations for phosphate-solubilizing fluorescent pseudomonads for agricultural and environmental uses. For this purpose, 30 isolates belong to fluorescent pseudomonad group were collected from microbial bank of Faculty of Agriculture of Vali-e-asr University of Rarsanjan. Then ability of all isolates for solubilizing tricalcium phosphate were studied. In addition, the ability of those isolates for increasing phosphorus availability in soil amended with and without phosphate rock at 15, 30 and 60 days was inspected. Finally, the persistence of the selected isolate was evaluated in some inoculant formulations. The results indicated that all isolates were able to increase the solubility of tricalcium phosphate in solid and liquid media of PKV and the pH of culture medium also decreased significantly. The maximum and minimum phosphate solubilization in solid media of PKV were related to isolates D33 and D24 and in liquid media, it was related to isolates D6 and D4 respectively. The results showed that isolates D33 and D35 increased the soil phosphorus bioavailability in 15, 30, 60 day after inoculation by 48, 25, 75% and 72, 50, 26% respectively. The cell numbers of D33 and D35 isolates in three inoculant formulations including talcum powder, talcum+rice bran and talcum+sawdust (180 days after inoculation) indicated that maximum and minimum of cell numbers of D33 were occurred in talcum powder and talcum+rice bran (105 cfu/g) and talcum+sawdust (8×103 cfu/g)  respectively. Maximum and minimum of cell numbers of D35 were observed in talcum+rice bran (105 cfu/g) and talcum+sawdust (10 cfu/g) respectively. Finally, inoculant formulation of talcum+rice bran was able to maintained an acceptable cell numbers of both isolates D33 and D35 (106 cfu/g) at the end of 150 days.

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