INFLUENCE OF INGCULATIGN OF EFFICIENT VAM FUNGI ON ONION (Allium cepa L.) AT DIFFERENT P-LEVELS
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Date
2001-08-08
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
Response of onion {Allium cepa L.) cv. N-53 to the inoculation of
efficient vesicular arbuscular mycorrhizal (VAM) fungi, Acaulospora laevis and
Gigaspora margarita at different P levels [0,50, 75 and 100 per cent
recommended dose (PRD) (75 kg ha'^)] was studied under glass house
condition.
The percent mycorhizal root colonization, spore count and mycorhizal
inoculation effect increased in the plants inoculated with VAM fungi with addition
of P up to 75 PRD (37.5 kg ha-1), while the population of free living N2 fixers and
P-solubilizers increased with addition of P upto 100 PRD of P (50 kg ha-1).
Among the VAM Fungi, plants inoculated with Gigaspora magarita had
significantly highest per cent mycorrhizal root colonization, spore count,
mycorrhizal inoculation effect, population of free living N2 fixers and Psolubilizers
in the rhizosphere soil as compared to plants inoculated with
Acauiospora iaevis and uninoculated control plants. The shoot P concentration,
alkaline phosphatase activity, total soluble solids, ascorbic acid content, plant
height, number of leaves, plant dry weight, fresh bulb weight, bulb diameter, bulb
length and neck thickness increased with increase in P level upto 100 PRD. The
fresh bulb weight, plant height and plant dry matter of onion was maximum in
plants inoculated with Gigaspora margarita and given 100 PRD of P. However it
did not differ significantly from plants inoculated with Gigaspora margarita and
given 75 PRD of P, suggesting a net saving of 25 PRD of P with efficient VAM
fungi.
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