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Evaluation of herbicides alone and in combination against complex weed flora in direct seeded basmati rice

KrishiKosh

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Title Evaluation of herbicides alone and in combination against complex weed flora in direct seeded basmati rice
 
Creator Bajiya, Rohitash
 
Contributor Dharam Bir
 
Subject chickpeas, intercropping, mustard, fertilizers, crops, yields, linseed, planting, sowing, biological development
 
Description A field experiment was conducted during the kharif season of 2013 at Chaudhary Charan
Singh Haryana Agricultural University, Regional Research Station, Karnal, India to study the different
combination of herbicides in direct seeded basmati rice with twenty treatments (T1
: pendimethalin
1000 g ha
-1
, T2
: bispyribac-Na 25 g ha
-1
, T3: bispyribac 25 g ha
-1
+ pyrazosulfuron 25 g ha
-1
,
T4
: bispyribac 25 g ha
-1
+ azimsulfuron 20 g ha
-1
, T5-T7
: bispyribac 25 g ha
-1
+ ethoxysulfuron
18.8, 28.0, 37.5 g ha
-1
, T8
: bispyribac 25 g ha
-1
+ fenosxarop (with safener) 60 g ha
-1
, T9:
penoxsulam + cyhalofop (ready-mix) 150 g ha
-1
, T10: T1
fb T2, T11: T1
fb T3, T12: T1
fb T4, T13-T15: T1
fb T5-T7, T16: T1
fb T8, T17: T1
fb azimsulfuron 20 g ha
-1
fb T8, T18: T10
fb one hand
weeding, along with weed free and weed checks) laid out in randomized block design with three
replications.
The experimental field was predominantly infested with Echinochloa crus-galli, Eragrostis,
tenella, Dactyloctenium, aegyptium, Ammannia baccifera and Cyperus rotundus. Pendimethalin 1000 g
ha
-1
(PRE) fb tank-mix combination of bispyribac-sodium 25 g ha
-1
with pyrazosulfuron 25 g ha
-1
or
azimsulfuron 20 g ha
-1
or ethoxysulfuron 18.0-37.5 g ha
-1
(WCE at 60 DAS: 93.3-95.6%) were realized
to be the best herbicidal combinations for control of complex weed flora in direct seeded rice, with
significant improvement in number of effective tillers (71.3-73.3/m.r.l.), number of grains/ panicle
(82.0-84.3), grain yield (4013-4103 kg ha
-1
), straw yield (5734-5823 kg ha
-1
), weed index (6.0-8.1%),
net returns (Rs 1,08,856-1,13,485 ha
-1
) and B-C ratio (2.45-2.53) as compared to weedy check
(35.0/m.r.l., 72.7, 1552 kg ha
-1
, 2641 kg ha
-1
, 64.4%, Rs 1,590 ha
-1
, 1.02, respectively). Bispyribac was
most effective against grassy weed E. crus-galli, pendimethalin against aerobic grassy weeds, and
pyrazosulfuron, azimslfuron and ethoxysulfuron against broadleaf weeds and sedges. Integration of one
hand weeding (40 DAS) with pendimethalin 1000 g ha
-1
(PRE) fb bispyribac sodium 25 g ha
-1
(20
DAS) provided almost complete control of all type of weeds with highest grain yield (4200 kg ha
-1
)
among different treatments which was at par with weed free check (4365 kg ha
-1
). The above herbicidal
combinations were superior to the already recommended combination of pendimethalin fb bispyribac in
terms of weed control, grain yield (3893 kg ha
-1
) and other indices. Plant height, 1000-grain weight and
harvest index were not influenced significantly by different treatments. Pendimethalin fb bispyribac +
pyrazosulfuron was realized to be the best treatment in terms of net returns and B-C ratio. Tank-mix
application of fenoxaprop had antagonistic effect on efficacy of bispyribac against weeds. Future
research efforts are needed for fine-tuning the post-emergence solutions for aerobic grasses.
 
Date 2016-09-15T10:45:12Z
2016-09-15T10:45:12Z
2014
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/76810
 
Language en
 
Format application/pdf
 
Publisher CCSHAU