SCREENING AND PERFORMANCE OF EFFICIENT VA MYCORRHIZAL FllNGl FOR TREE SPECIES SUITABLE FOR AGROFORESTRY
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Date
1998-08-19
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
A survey work was conducted to isolate the
predominant spore types from the rhizosphere soil of five major
tropical tree species viz., teak,. silveroak, casuarina,
shisham and tamarind. After isolation of predominant local
isolates or VAM fungi from each tree species, they were mass
multiplied in rhodes grass using sterilized sand, soil (1-1)
mix.
Two predominant local isolates and four standard VAM
-ungi were-used for screening and selection of- efficient VAM
fungi for. all the. .five tree species. The results of this trial
clearly ^ brought out that the efficient VAM fungus for
inoculating at nursery level is SclQracystis dussii for teak,
Gigaspora margarita for silveroak and tamarind, and Glomu's
f3.sciculatuin.tox casuarina and shishai.
After selection of efficient VAM fungi for each tree
species the second experiment was carried out to determine
the optimum P-dose using differMt levels of phosphorus
(0,50, 75 and 100 kg P2O5 psr hectare
as single superphosphate). The results clearly indicated that the
optimum level of phosphorus was 75 kg P7O5 per hectare for
teak and silveroak, 50 kg P2O5 per hectare for casuarina,
shisham and tamarind which can be used to harness maximum
benefits rrom inoculations with respective efficient VAM fungi.
After knowing efficient VAM fungi and optimum level
of^ P-dose. for each tree species in the previous trails, the
third set of experiment was carried out to study the effect of
dual inoculation of efficient VAM fungi and P-solubilizer
Pseudomonas striata using two forms of phosphorus [Rock
phosphate (RP) and single superphosphate (SSP)]. The results of
this study clearly brought that dual inoculation of efficient
VAM fungi and P-solubilizer to be superior in improving
growth, nutrition and dry matter production of all the five
tree species. Among two forms of P, rock phosphate was found to
be superior in improving growth, nutrition and dry matter
production of all the five tree species.
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