ALKALI TOLERANT PENICILLUM ASTURIANUM AS PLANT GROWTH PROMOTER FOR NUTRIENT DEFICIENT CALCAREOUS SOIL.
Objectives: Calcareous soils of India with high soil pH and nutrient deficiency has always been a problem for crop cultivation. Crops grown in these soil record severe nutrient deficiency and yield loss. Biological remediation by microorganism is a novel approach for problematic calcareous soils and can play a major role in enhancing the crop production.
Methods: A study was conducted for isolation of native microbial flora from areas where soils having pH more than 8.0.
Results: An alkali tolerant Penicillium asturianum (IPL/KB/F3) was isolated from soils recorded with high pH (alkali soils). The isolates showed remarkable amount of alkali tolerance and phosphate solubilising activity along with other insoluble elements. In vitro study showed 54Â±1.13 to 92Â±1.16 Âµg/ml of Phosphate solubilisation within 3-5 days. The isolate was able to tolerate high alkaline pH upto 11.0 and was able to solubilise micronutrients. The isolated Penicillium spp. were allowed to grow at higher concentration of Calcium Carbonate and were studied for its ability for nutrient solubilisation of different insoluble micronutrients.
Conclusion: The high tolerance to alkaline pH and capability of nutrient solubilisation by Penicillium asturianum (strain no. IPL/KB/F3) thus identified as novel isolate and can be used as a biological input to improve crop cultivation in alkaline soil.
Key words: Â Calcareous soil, Isolation, Alkali tolerant, Penicillium asturianum, acid production, Nutrient Solubilisation.
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