ROLE OF PLANT GROWTH PROMOTING RHIZOBACTERIA ON GROWTH AND YIELD OF PIGEONPEA (Cajanus cajan L.) CULTIVARS
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Date
2001-08-08
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
A field experiment was conducted at Raichur on medium black soil, under
rainfed conditions to study the role of plant growth promoting rhizobacteria (PGPR) on
growth and yield of pigeonpea cultivars ICPL-87 (short duration) and ICPL-87119
(medium duration).
The parameters like plant height, nodule number, nodule dry weight, dry matter
production at different stages of crop growth, in both the varieties were most superior
in the treatment receiving the triple inoculation of seeds with Rhizobium, (GB-1)
Azospirillum (ACD-20) and Pseudomonas striata (strain No. 27) followed by dual
inoculations, single inoculations and uninoculated control. Similarly, the yield parameters
like stalk yield, seed weight per plant, 100 seed weight, number of seeds per pod and
grain yield also show ed a significant increase in triple inoculation over all other treatment
combinations. The same trend was observed with N-uptake, P-uptake, ureide content,
bacterial population. N2-fixers and P-solubilizers.
In vitro germination study indicated that treatment receiving triple inoculation
showed maximum germination, seedling vigour which was significantly superior over
dual and single inoculation treatments and control.
Rhizobium. Azospirillwn and Pseiidoinonas sthaia strains were examined
for in vitro production of lAA and GA. Maximum lAA production w as obtained in dual
inoculated culture medium with Rhizobiwn and Azospirillwn (41.07 pg/ 25 ml), and
was on par with triple inoculated culture. GA production was highest in triple inoculated
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