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Birsa Agricultural University, Ranchi

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19951
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Subject: Soil Science and Agriculture Chemistry × Author: Sanjay Kumar × End date: 2018 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    P solubilizers in soil plant ecosystems of chotanagpur plateau and their soil phosphorus
    (Birsa Agricultural University, Ranchi, 1995) Sanjay Kumar; A Raza
    The present investigation was undertaken with a view to isolate and identify efficient phosphate solubili zing microflora from varied soil-plant ecosystems prevalent in the plateau region vis-a-vis to examine the efficacy of the selected isolates to solubilize added insoluble inorga nic phosphates (MAP, ALPO) and native P in soils of upland and lowland toposequences. Results indicated presence of P-solubilizing microorganisms in the rhizosphere of various cultivated as well as wild plant species occuring in this region as nine bacterial and three fungal P-solubilizing strains were iso lated from rhizospheric soils of different locations. A wide variations occurred in the extent of P solubilization through bacteria and fungi. The amount of P released as citrate soluble P was considerably higher com pared to water soluble P and available P at different incu bation periods. The forms of P in liquid media with MRP (1.0% P₂05 basis) were generally higher than those used at 2.5% P205 basis. similar trend was noted in case of AlPO4 with selected bacterial and fungal species. The release of P at 15 days of incubation in liquid media was highest which declined with passage of time.Both inoculation and P sources significantly influenced the availability of P in soil. wailability of P in lowl and soil in aitrate soluble forms was higher than the corresponding upland soil. Based on solubilization of Ce,(PO4)2 in liquid and HRP and AlPO in liquid as well as in soil, isolates PSB and PSB₂ of bacteria and PS2₁ of fungi were identified as the most efficient phosphate solubilizers, however, fungal isolates showed overall superiority.