STUDIES ON THE EFFECT OF PRE AND POST EMERGENCE HERBICIDES ON WEED CONTROL, GROWTH AND YIELD OF GROUNDNUT
Loading...
Files
Date
2002
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Acharya N G Ranga Agricultural University, Guntur
Abstract
A field experiment was conducted during rabi 200-2001 on sandy loam
soils in Tirupati Campus of the Acharya N .G. Ranga Agricultural University
to study the effect of pre and post emergence herbicides on weed control.
growth and yield of groundnut.
The experiment was laid out in a rando~nised block design with three
replications. There were twelve treatments viz.. unweeded control.
intercultivation at 20 DAS with star weeder, intercultivation at 20 DAS with
stanveeder followed by (fb) hand weeding at 40 DAS, two hand weedings (20
and 40 DAS) pre-plant incorporation of fluchloralin @ 1.5 kg ha", preemergence application of pendiinethalin @ 1.5 kg ha-', post emergence
application of i~nazethapyr 75 g a.i. ha" at 20 DAS, fluchloralin flo imazethappr.
pendimethalin fb iinazethapyr, fluchloralin fb hand weeding at 40 DAS,
pendiinethalin fb hand weeding at 40 DAS and i~nazethapyr fb hand weeding at
40 DAS.
Seventeen weed species were identified and they belonged to 10 families
of which Cyperus rotundw L being predominant. Ainong the weed coiltrol
treatments pre emergence application of pendimethalin @ 1.5 kg a.i. ham' fb
irnazethapyr @ 75 g a.i. ha' at 20 DAS, pre plant incorporation of flucllloralin
@ 15 kg a.i. ha-' fb irnazethapyr @ 75 g a.i ha-' at 20 DAS and hand weeding
twice (20 and 40 DAS) were effective against all types of weeds and also gave
higher weed control efficiency.
Plant height, LA1 and dry matter production were I~igl~er with
pendiinethal in fb i~nazethapyr which was on par with fluchloralin fb imazethapyr
and hand weeding twice (20 and 40 DAS) where as unweeded courrol.
intercultivation alone, imazethapyr alone had lower values for all t hr: above
characters. The number of nodules per plant and nodule dry weight was highest
in hand weeding twice which was on par with pendirnethalin fb imazethapyr and
fluchloralin fi imazethapyr.
The number of pegs per plant, Total number of pods per plant, filled pods
per plant , 100 pod weight, 100 kernel weight, shelling percentage were lvore
with pre emergence application of pendiinethalin fb ilnazethapyr at 20 DAS and
was comparable with fluchloralin fb imazethapyr and hand weeding twicr (20
and 40 DAS).
Pre-emergence application of pendimethal in fb ilnazet hapyr at 20 \)AS
gave higher pod (2162 kg ha-') and haul~n (3860 Kg ha-') yield and was
colnparable with fluchloralin fb imazethapyr and hand weeding t~vice.
Net returns (Rs. 3075 ha-') and benefit cost ratio (2.5) were higher wit11
fluchloralin @ 1.5 kg a.i. ha-' as PPI ib irnazethapyr @ 75 g a.i. ha-' at 20 DAS.
The above results revealed that pre-plant incorporation of fl~ichlural in
@ 1.5 kg a.i. ha" fb imazethapyr @ 75 g a.i. ha" at 20 DAS was found be
effective weed management practice, considering the econonlic rerurns,
eventhough pendimethalin fb imazethapyr gave equally higher yield in irri_eated
groundnut during rabi on sandy loam soiis.
Description
D1186 - B.SASIKALA