MUTUALISTIC ASSOCIATION BETWEEN Leucaena leucocephala AND Glomusaggregatum AS INFLUENCED BY APPLICATION OF NUTRIENTS AND BIOCHAR IN AN ALFISOL
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Date
2015-07-10
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
A greenhouse investigation was conducted to determine the effect of biochar
application on effectiveness of VAM symbiosis in Leucaena leucocephala at different
nutrient levels. This investigation consisted of 24 treatments resulting from factorial
combination of two levels of biochar, six levels of nutrient and two levels of Glomus
aggregatum inoculation. Mycorrhizal colonization in roots of Leucaena was significantly
reduced at higher nutrient levels. The phosphorus content in shoot as well as root and
total phosphorus uptake increased significantly in plant colonized with VAM fungus at
all levels of nutrient amendment, irrespective of biochar application. The inoculation of
soil with VAM fungus increased biomass production by Leucaena at all nutrient
amendment at both levels of biochar application. Leucaena plants grown in soil amended
with biochar produced less biomass than those grown in soil without biochar amendment
at all levels of nutrient application. The linear regression analysis of data indicates the
effect of nutrient levels on total biomass and total phosphorus uptake is more pronounced
than that of biochar levels. The results of this investigation exemplifies the significance
of optimizing nutrient application rate as well as level of biochar amendment in order to
derive maximum benefit from VAM symbiosis.
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