A pot experiment was conducted to evaluate the response of selected species of mycorrhizae for root colonization and phosphorus uptake by maize in an alluvial soil. Of all the species of mycorrhizae taken under consideration, Glomus mosseae was found to perform better in terms of root colonization, number of spores, grain yield and phosphorus uptake. The maximum plant height (28.5 cm), shoot dry weight (19.45 g plant-1) and root dry weight (4.77 g plant-1) was also found with the application of G. mosseae. Its application significantly increased the root dry weight by 99.58 and 72.82% over application of G. intraradices and control respectively, and was at par with the application of G. coronatum and Gigaspora decipiens. Application of G. decipiens reported the highest bacterial (39.11 cfu g-1 soil) and fungal count (30.68 cfu g-1 soil) that was found to be at par with application of G. mosseae. Application of G. mosseae significantly increased the actinomycetes population by 44.71 and 55.97% over application of a local mycorrhizal strain and control. Maximum dehydrogenase activity (56.00 g-1 TPF g-1 24 h-1) and acid phosphatase activity (0.299 mg PNP g-1 h-1) and was also observed with application of G. mosseae, which in turn resulted in higher yield which was 27.28%, 28.52%, 9.35 and 11.7% more than G. intraradices, G. coronatum, G. decipiens and the local species respectively. G. mosseae inoculation proved to be effective in modifying the soil microbe population and community structure and also in enhancing the soil enzymatic activities and phosphorus uptake of the crop.
Alluvial soil, Grain yield, Maize, Mycorrhiza, Phosphorus
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