PHYSIOLOGICAL BASIS OF INDUCTION OF DORMANCY N GROUNDNUT Arachis hypogaea L.)
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Date
2004
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University of Agricultural Science, Dharwad
Abstract
"A field experiment was conducted at the Main Agricultural
Research Station, University of Agricultural Sciences, Dharwad during kharif
2002 to study tlie physiological basis of induction of dormancy in groundnut
cv. JL-24. The experiment consisted of foliar application of maleic hydrazide
at two stages (60 and 80 DAS) with nine concentrations along with control.
The experiment was laid out in randomised block design with three
replications.
The results revealed that MH @ 300 ppm (60 and 80 DAS)
significantly increased number of branches, leaf and stem dry matter, LAI,
TDM, LAD, CGR, NAR, AGR and SLW followed by application of MH @
200 ppm (60 and 80 DAS) as compared to control. Higher concentration of
MH improved RGR values while the plant height decreased significantly.
Among the biochemical parameters, chlorophyll 'a', chlorophyll 'b' and total
chlorophyll contents were significantly more with MH @ 300 ppm (60 and
80 DAS) followed by MH @ 200 ppm (60 and 80 DAS).
The important yield and yield components viz., pod yield, haulm
yield, kernel yield, shelling per cent and oil content were significantly more
with MH @ 300 ppm (60 and 80 DAS) followed by MH @ 200 ppm (60 and
80 DAS) as compared to control.
The post harvest observations (immediately after harvest and 15
days after harvest) revealed that the germination per cent, shoot length,
root length and whole seedling length and seedling vigour index were found
more in control and these parameters were lowest in treatment with MH @
300 ppm and this treatment showed more number of dormant seeds. The
total phenol contents were more in control and application of MH reduced
the contents. The B:C ratio was higher with MH @ 200 ppm (60 and
80 DAS) followed by MH @ 300 ppm (60 and 80 DAS) as compared to control."
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