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INTEGRATED WEED MANAGEMENT IN RABI GROUNDNUT

KrishiKosh

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Title INTEGRATED WEED MANAGEMENT IN RABI GROUNDNUT
 
Creator SRINIVASA RAO, S
 
Contributor RAGHAVA REDDY, C
 
Subject INTEGRATED, WEED, MANAGEMENT, RABI, GROUNDNUT
 
Description A field experiment was laid out in a randomized block design with eleven
treatments replicated thrice during rabi 2008-09, at College Farm, College of
Agriculture, Rajendranagar, Hyderabad, to study the effect of pre and post emergence
herbicides and integrated practices on weed control, growth and yield of groundnut.
There were twelve treatments viz., control (no weeding), hand weeding twice,
intercultivation at 20 DAS with star weeder, intercultivation at 20 DAS with star
weeder followed by (fb) hand weeding at 40 DAS, pre emergence application of
pendimethalin @ 1.0 kg a.i ha-1, post emergence application of imazethapyr @ 100 g
a.i ha-1, post emergence application of Quizalofop-p-ethyl @ 50 g a.i ha-1,
pendimethalin fb imazethapyr, pendimethalin fb Quizalofop-p-ethyl, pendimethalin fb
handweeding at 40 DAS, imazethapyr fb handweeding at 40 DAS and Quizalofop-pethyl
fb handweeding at 40 DAS.
In the experimental field, three species of grasses, one species of sedge and
twelve species of broad leaved weeds were identified and they belonged to 10 families
of which Parthenium hysterophorus being predominant. Among the weed control
treatments hand weeding twice (20 and 40 DAS), intercultivation with star weeder at
20 DAS fb hand weeding at 40 DAS, pendimethalin @ 1.0 kg a.i ha-1 as PE fb hand
weeding at 40 DAS, imazethapyr @ 100 g a.i ha-1 at 20 DAS fb hand weeding at 40
DAS and pendimethalin @ 1.0 kg a.i ha-1 as PE fb imazethapyr @ 100 g a.i ha-1 at 20
DAS were effective against all types of weeds and also gave higher weed control
efficiency.
Growth parameters like plant height and LAI were higher with hand weeding
twice (20 and 40 DAS) which was comparable with intercultivation with star weeder
at 20 DAS fb hand weeding at 40 DAS, pendimethalin @ 1.0 kg a.i ha-1 as PE fb hand
weeding at 40 DAS and higher dry matter production with hand weeding twice (20
and 40 DAS), pendimethalin @ 1.0 kg a.i ha-1 as PE fb hand weeding at 40 DAS,
imazethapyr @ 100 g a.i ha-1 at 20 DAS fb handweeding at 40 DAS and
pendimethalin @ 1.0 kg a.i ha-1 as PE fb imazethapyr @ 100 g a.i ha-1 at 20 DAS
which were on par with each other. Where as control (no weeding), intercultivation
alone, pendimethalin alone, imazethapyr alone and Quizalofop-p-ethyl alone had
lower values for all the above characters.
Yield components like the total number of pods per plant, filled pods per plant,
pod weight per plant, 100 pod weight, 100 kernel weight and shelling percentage were
more with hand weeding twice (20 and 40 DAS), intercultivation with star weeder at
20 DAS fb hand weeding at 40 DAS, imazethapyr @ 100 g a.i ha-1 at 20 DAS fb
handweeding at 40 DAS, pendimethalin @ 1.0 kg a.i ha-1 as PE fb hand weeding at 40
DAS and pendimethalin @ 1.0 kg a.i ha-1 as PE fb imazethapyr @ 100 g a.i ha-1 at 20
DAS and also these treatments followed similar trend in pod yield (1649-1754 kg ha-1)
and haulm yield (ranged 2400-2439 kg ha-1).
There was lower nutrient uptake by weeds and higher uptake by the crop in
hand weeding twice (20 and 40 DAS) and intercultivation with star weeder at 20 DAS
fb hand weeding at 40 DAS over the other treatments. Higher N status and lower P and
K status of the soil in the treatments of hand weeding twice (20 and 40 DAS),
intercultivation with star weeder at 20 DAS fb hand weeding at 40 DAS, imazethapyr
@ 100 g a.i ha-1 at 20 DAS fb handweeding at 40 DAS, pendimethalin @ 1.0 kg a.i ha-
1 as PE fb hand weeding at 40 DAS and pendimethalin @ 1.0 kg a.i ha-1 as PE fb
imazethapyr @ 100 g a.i ha-1 at 20 DAS over the other treatments was observed.
The net returns was highest with intercultivation with star weeder at 20 DAS fb
hand weeding at 40 DAS (Rs.24777 ha-1) which was comparable with pendimethalin
@ 1.0 kg a.i ha-1 as PE fb hand weeding at 40 DAS (Rs. 24436 ha-1), hand weeding
twice at 20 and 40 DAS (Rs. 24235 ha-1), imazethapyr @ 100 g a.i ha-1 at 20 DAS fb
handweeding at 40 DAS (Rs. 23940 ha-1) and pendimethalin @ 1.0 kg a.i ha-1 as PE fb
imazethapyr @ 100 g a.i ha-1 at 20 DAS (Rs. 23935 ha-1).
The benefit: cost ratio (Rs.1.77) was more with pendimethalin @ 1.0 kg a.i ha-1
as PE fb imazethapyr @ 100 g a.i ha-1 at 20 DAS which was comparable with
pendimethalin @ 1.0 kg a.i ha-1 as PE fb hand weeding at 40 DAS (Rs. 1.72) and
intercultivation with star weeder at 20 DAS fb hand weeding at 40 DAS (Rs.1.71)
treatments.
 
Date 2016-07-30T10:23:42Z
2016-07-30T10:23:42Z
2009
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/70207
 
Language en
 
Relation D8523;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD