PHOSPHORUS UPTAKE AND GROWTH OF LEUCAENA LEUCOCEPHALA AND SESBANIA GRANDIFLORA AS INFLUENCED BY APPLICATION OF ACIDULATED AND BIO-ACTIVATED ROCK PHOSPHATE AND INOCULATION OF SOIL WITH GLOMUS AGGREGATUM
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Date
2017-12-27
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
A greenhouse study was conducted to determine the influence of application of North
Carolina Rock Phosphate (NCRP) formulations and inoculation of soil with Glomus
aggregatum on phosphorus nutrition and growth of Leucaena and Sesbania. This
investigation consisted of 24 treatments arising from a factorial combination of two plant
species, two levels of Glomus aggregatum and six types of phosphorus applications.
Based on titrable acidity data the acidification potential of Penicillium sp. was found to
be higher than that of Bacillus sp. Application of different formulations of phosphorus
significantly increased the extent of root colonization by Glomus aggregatum in
Leucaena where as in Sesbania application of acidulated and bio-activated NCRP
reduced the extent of colonization by Glomus aggregatum. The inoculation of soil with
Glomus aggregatum caused significant increase in total phosphorus uptake in both plants,
in total biomass of Leucaena and in root weight of Sesbania. The colonization in roots of
plants by Glomus aggregatum significantly enhanced phosphorus uptake efficiency. The
results of this investigation indicate that NCRP bio-activated with Penicillium sp could
serve as a source of phosphorus to plants and inoculation of soil with Glomus
aggregatum enhances the effectiveness of bio-activated NCRP.
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