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STUDIES ON SEQUENTIAL APPLICATION OF HERBICIDES IN COTTON (Gossypium hirsutum L.)

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Title STUDIES ON SEQUENTIAL APPLICATION OF HERBICIDES IN COTTON (Gossypium hirsutum L.)
 
Creator MADHU GUMMADI
 
Contributor SRINIVASULU, K
 
Subject bacteria, meat, livestock, biological phenomena, sampling, diseases, enzymes, poultry equipment, polysaccharides, eggs
 
Description A field experiment entitled “Studies on sequential application of
herbicides in cotton (Gossypium hirsutum L.)” was conducted during kharif,
2011 on clay loam soils of Agricultural College Farm, Bapatla. The experiment
was laid out in a randomized block design with eleven treatments comprising of
T1- Weedy check; T2- Hand weeding twice at 30 and 60 DAS; T3- Pendimethalin
@ 1.5 kg a.i. ha-1 as pre-emergence; T4- Pendimethalin @ 1.5 kg a.i. ha-1 as preemergence
followed by interculture at 40 DAS; T5- Pendimethalin @ 1.5 kg a.i.
ha-1as pre-emergence followed by fenoxaprop ethyl @ 56 g a.i. ha-1 as postemergence
at 40 DAS; T6-Pendimethalin @ 1.5 kg a.i. ha-1as pre-emergence
followed by quizalofop @ 50 g a.i. ha-1 as post-emergence at 40 DAS;
T7- Pendimethalin @ 1.5 kg a.i. ha-1as pre-emergence followed by pyrithiobac
@ 63 g a.i. ha-1 as post-emergence at 40 DAS; T8- Interculture at 20 DAS
followed by fenoxaprop ethyl @ 56 g a.i. ha-1 at 40 DAS; T9- Interculture at 20
DAS followed by quizalofop ethyl @ 50 g a.i. ha-1 at 40 DAS; T10- Interculture
at 20 DAS followed by pyrithiobac @ 63 g a.i. ha-1 at 40 DAS and T11- Farmer’s
practice (four times at 15 days interval). The treatments were replicated three
times.
The weed species which infested the experimental plot were grasses like
Cynodon dactylon, Dactyloctenium aegyptium, Digitaria sanguinalis (L.) Scop.,
Echinochloa colonum, Panicum repens Linn., sedge Cyperus rotundus Linn. and
broad leaved weeds like Acalypha indica Linn., Acalypha ciliata, Achyranthes
aspera, Aristolochia bracteata Retz., Cleome viscosa Linn., Commelina
benghalensis Linn., Corchorus trilocularis Linn., Cynotis cucullata Kurtz.,
Digera arvensis Forsk, Euphobia hirta, Euphorbia geneculata, Merrimia
emerginata Hallier., Physalis minima, Phyllanthus maderaspatensis Linn.,
Trianthema portulacastrum, Linn. and Tridax procumbens. Among the weed
flora identified in the experimental plot, Cynodon dactylon, Cyperus rotundus,
Panicum repens, Digera arvensis, Cynotis cucullata, Phyllanthus
maderaspatensis, and Trianthema portulacastrum were predominant.
Weed density was significantly reduced by all weed management
practices over the weedy check. The minimum weed density was recorded with
farmer’s practice (T11). Among the weed management practices, pendimethalin
@ 1.5 kg a.i. ha-1 fb interculture at 40 DAS (T4), pendimethalin @ 1.5 kg a.i.
ha-1 fb pyrithiobac @ 63 g a.i. ha-1 at 40 DAS (T7) and interculture at 20 DAS fb
pyrithiobac @ 63 g a.i. ha-1 at 40 DAS (T10) treatments were comparable with
that of hand weeding twice at 30 and 60 DAS (T2).
The lower dry weight of weeds and higher weed control efficiency was
recorded with farmer’s practice (T11). Among the weed management practices,
pendimethalin @ 1.5 kg a.i. ha-1 fb interculture at 40 DAS (T4), pendimethalin
@ 1.5 kg a.i. ha-1 fb pyrithiobac @ 63 g a.i. ha-1 at 40 DAS (T7) and interculture
at 20 DAS fb pyrithiobac @ 63 g a.i. ha-1 at 40 DAS (T10) treatments were
comparable with that of hand weeding twice at 30 and 60 DAS (T2). The
minimum uptake of nutrients by weeds and lower weed index were recorded
with farmer’s practice (T11). Among the weed management practices,
pendimethalin @ 1.5 kg a.i. ha-1 fb interculture at 40 DAS (T4), pendimethalin
@ 1.5 kg a.i. ha-1 fb pyrithiobac @ 63 g a.i. ha-1 at 40 DAS (T7) and interculture
at 20 DAS fb pyrithiobac @ 63 g a.i. ha-1 at 40 DAS (T10) treatments were
comparable with that of hand weeding twice at 30 and 60 DAS (T2).
Plant height, number of monopodial and sympodial branches per plant,
dry matter accumulation and uptake of nutrients by the crop were found to be
higher with farmer’s practice (T11). Among the weed management practices,
pendimethalin @ 1.5 kg a.i. ha-1 fb interculture at 40 DAS (T4), pendimethalin
@ 1.5 kg a.i. ha-1 fb pyrithiobac @ 63 g a.i. ha-1 at 40 DAS (T7) and interculture
at 20 DAS fb pyrithiobac @ 63 g a.i. ha-1 at 40 DAS (T10) treatments were
comparable with that of hand weeding twice at 30 and 60 DAS (T2).
Yield attributing characters and seed cotton yield was significantly higher
with farmer’s practice (T11) than all other treatments studied. Among the weed
management practices, pendimethalin @ 1.5 kg a.i. ha-1 fb interculture at 40
DAS (T4), pendimethalin @ 1.5 kg a.i. ha-1 fb pyrithiobac @ 63 g a.i. ha-1 at 40
DAS (T7) and interculture at 20 DAS fb pyrithiobac @ 63 g a.i. ha-1 at 40 DAS
(T10) treatments were comparable with that of hand weeding twice at 30 and 60
DAS (T2), whereas, in weedy check an yield reduction of 56.8 per cent was
recorded.
The higher seed cotton yield, net returns and returns per rupee of
investment were found to be higher with the farmer’ practice. Among the weed
management practices, even though higher seed cotton yield and gross returns
were recorded with hand weeding twice at 30 and 60 DAS but the net returns
and returns per rupee of investment were low due to high cost of manual
weeding. Therefore, pendimethalin @ 1.5 kg a.i. ha-1 fb interculture at 40 DAS
(T4), pendimethalin @ 1.5 kg a.i. ha-1 fb pyrithiobac @ 63 g a.i. ha-1 at 40 DAS
(T7) and interculture at 20 DAS fb pyrithiobac @ 63 g a.i. ha-1 at 40 DAS (T10)
found to be more profitable than hand weeding twice at 30 and 60 DAS.
 
Date 2016-06-22T12:06:42Z
2016-06-22T12:06:42Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67695
 
Language en
 
Relation D9415;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY