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EFFICIENCY OF CERTAIN HERBICIDES, THEIR FORMULATIONS AND FORMS OF UREA ON WEED CONTROL AND YIEtD IN TRANSPLANTED RICE

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Title EFFICIENCY OF CERTAIN HERBICIDES, THEIR FORMULATIONS AND FORMS OF UREA ON WEED CONTROL AND YIEtD IN TRANSPLANTED RICE
 
Creator RAVINDER, NAMALA
 
Contributor BHOJI REDDY, G
 
Subject EFFICIENCY, CERTAIN, HERBICIDES, FORMULATIONS, FORMS, UREA, WEED CONTROL, YIELD, TRANSPLANTED, RICE,
 
Description The present investigation entitled "EFFICIENCY
OF CERTAIN HERBICIDES, THEIR FORMULATIONS AND FORMS OF
UREA ON WEED CONTROL AND YIELD 'IN TRANSPLANTED RICE"
was conducted on sandy clay loam soil of medium fertility
status at Agriculture College Farm, Rajendranagar,
during kharif 1988. The experiment was laid out in a
randomised block design {factorial) with 22 treatments,
replicated thrice. The treatments consisted of two
forms of urea viz., prilled urea and large granular
urea and eleven weed control treatments under each form
viz., three herbicid~s {i.e., butachlor, benthiocarb
and anilofos) each one tried with three formulations
{i.e., coating of urea with EC formulation of herbicide,
EC formulation and granular formulation)
compared with hand weeding and no weeding as check.
The test vari~ty was Tellahamsa.
The weeds found during the study were Cyperus
difformis, Cyperus iria and Scripus supinus {Sedges),
Echinochloa colonurn, "ECFiinochloa crusgalli, Brachiaria
mutica and Cynodon d~ctylon {grasses), Monochoria
vaginalis, Cesulia axillaris, Eclipta alba, Ipomea
aquatica and Marselia minuta {broad leaved weeds).
In general, sedges were found to be more
with PU, while grasses and broad leaved weeds were
dominant with LGU. Total weed density was more in PU,
but the dry matter of weeds was more with LGU. Application
of large granular urea resulted in maximum
uptake of nutrients by weeds as well as crop, besides
increasing number of tillers, dry matter production of crop, number of panicles, number of filled grains per panicle, panicle weight ind test weight. Large granu~
la;1 urea (3971 kg ha- ) outyielded the PU (3809 kg
ha ).
Butachlor was most effective in lowering the
percentage of srasses and broad leaved weeds in PU.
In general, butachlor recorded significantly lesser
weed density coupled with lower dry weight of weeds
resulting in lesser weed index and higher weed control
efficiency than anilof qs and benthiocarb in both the
forms of urea. No severe phytotoxic effects were
observed on rice due to applica;tion of · herbicides.
App~ication of but~chlor significantly accounted for
higher yield attributes viz., panicles, filled grains,
panicle weight and test weight compared to ani!~f os and
benthiocarb. -!aximum grain yield (4102 kg ha in PU
and 4272 .kg ha in LGU) was reco1ded with butachlor
fo!towed .by anilofos (3978 kg ha- in Pg1and 4167 kg
ha in L@£> and benthiocarb (3857 kg ha in PU and
4060· kg ha in LGU). Uptake of nutrients (N, P and K)
was also maximum with butachlor. Higher additional
grain yield due to herbicides over unweeded. check and
the maximum response of the additional grain yield to
ope kg N applied was recorded with butachlor whereas
higher co~t-benefit ratio was obtained with anilofos in
both the forms of urea.
Coating of urea with EC formulation of
herbicide controlled· grasses in both the forms of
urea. This formulation resulted in significant
reduction in weed density, weed dry matter, weed index
and higher weed control efficiency. Maximum uptake of
N, P and K by weeds was found with the spray of EC
formulation irrespective of the fo~ . of urea.
Significantly more number of tillers m , higher ~ry
matter of Q20P and yield components viz., number of
panicles m , number of filled grain per panicle,
panicle weight and test weight were observed with
coating of urea with EC formulation of. herbicide in
both the form~ 1of urea. There was an incr~rse of 397
and 279 kg ha in PU and 352 and 243 kg ha in LGU of
grain yield over EC and granular formulation with EC
formulation of herbicide coated over urea, which also
recorded highest uptake of all the nutrients by crop.
The additional grain yield due to herb~cides over
unweeded check and the response of the additional
grain yield to one kg N appl~ed was also · found to be
more in coating of urea with EC formulation of
herbicide in both the forms of urea. The cost-benefit
ratio was also superior with this formulation.
There was no interaction betwee~ herbicides
and their formulations in both the forms of urea
throughout the investigation.
 
Date 2016-08-08T14:48:33Z
2016-08-08T14:48:33Z
1989
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/71572
 
Language en
 
Relation D3174;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD