Evaluation of Vesicular Arbuscular Mycorrhizal (VAM) fungi on bioavailability of Zn in direct seeded rice (Oryza sativa L.)
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Date
2016-08
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Department of Soil Science & Agricultural Chemistry, BAU, Sabour
Abstract
AM fungi plays very important role in the increase the root surface area and uptake of some macro and micronutrients. In direct seeded rice (DSR), the plant availability of micronutrients like Zn is likely to be less. Considering facts, a pot experiment was conducted in the Department of Soil Science and Agricultural Chemistry, Bihar Agricultural University, Sabour on “Evaluation of vesicular arbuscular mycorrhizal (VAM) fungi on bioavailability of Zn in direct Seeded rice (Oryza sativa L.)”. Four AM fungi species were evaluated under zinc deficient soil in completely randomized design (CRD) with three replications. Among all the AM fungi species, plant height was found maximum under the treatment T3 (Glomus mosseae + 100% RDF NK). The root dry weight was maximum (3.12 g) in treatment T3 (Glomus mosseae + 100% RDF NK), which was observed significantly higher when compared with other treatments. Maximum AM colonization and spore count was observed at panicle initiation stage with the application of same treatment. The higher microbial populations were recorded at panicle initiation stage with application of treatment T3 (Glomus mosseae + 100% RDF NK). This treatment also gave maximum dehydrogenase activity (55.86 µg TPF g-1 24 hr-1), acid phosphatase activity (0.299 mg PNP g-1 hr-1) and alkaline phosphatase activity (0.54 mg PNP g-1 hr-1) followed by application of treatment T6 (Gigaspora decipien + 100% RDF NK) at panicle initiation stage. Application of treatment T3 (Glomus mosseae + 100% RDF NK) significantly increased DTPA extractable Zn in soil and Zn content in plant when compared with all the treatments but found at par with the application of treatment T6 (Gigaspora decipien + 100% RDF NK). The maximum zinc uptake (0.056 mg pot-1) by grain was recorded under treatment T3 (Glomus mosseae + 100% RDF NK) followed by application of treatment T6 (Gigaspora decipien + 100% RDF NK). Highest grain yield (14.08 g pot¬-1) was found with the treatment T3 (Glomus mosseae + 100% RDF NK) among all AM fungi species and it was at par with the treatment T2 (100% RDF). As evident from the results, among all the AM fungi species Glomus mosseae sp. can effectively modify the soil microbe population and community structure by increasing the soil enzymatic activities and significantly increased the zinc uptake by grain in DSR rice, when compared with other applied AM fungi species.
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