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Sequential Application of Pre and Post-Emergence Herbicides for Weed Control in Bt-Cotton

KrishiKosh

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Title Sequential Application of Pre and Post-Emergence Herbicides for Weed Control in Bt-Cotton
 
Creator Chethan K.S.
 
Contributor S.R. Salakinkop
 
Subject Agronomy
 
Description A field experiment was conducted during kharif 2012 to study the sequential
application of pre and post-emergence herbicides for weed control in Bt-cotton at MARS,
Dharwad. The experiment comprised of 14 treatments laid out in RCBD with three
replications. Treatments consisted of per-emergence application (Diuron @ 1.25 kg a.i. ha-1
(T1)), post-emergence blanket application (Imezathapyr 0.075 kg a.i. ha-1 (T2) and Pyrithiobac
0.075 kg a.i. ha-1 (T4)) and directed application (Oxyfluorfen @ 0.10 kg a.i. ha-1 (T3),
Glyphosate @ 2.5 kg a.i. ha-1 (T5) and glufosinate ammonium @ 0.375 kg a.i. ha-1 (T6)) at 35
DAS and sequential application of diuron @ 1.25 kg a.i. ha-1 as pre-emergence fb postemergence
blanket spray of imezathapyr 0.075 kg a.i. ha-1, pyrithiobac 0.075 kg a.i. ha-1 and
directed spray of oxyfluorfen @ 0.10 kg a.i. ha-1, glyphosate @ 2.5 kg a.i. ha-1 and
glufosinate ammonium @ 0.375 kg a.i. ha-1 spray at 55 DAS (T7, T9, T8, T10, T11 respectively)
were compared with weed free (T12), weedy check (T13) and farmers practice (T14).
Among the herbicides, diuron @ 1.25 kg a.i. ha-1 as pre-emergence fb glyphosate @
2.5 kg a.i. ha-1 or glufosinate ammonium @ 0.375 kg a.i. ha-1 significantly reduced weed
density, weed dry weight, nutrient uptake by the weeds at all growth stages and recorded
good to excellent control of weeds. Weed control efficiency, total dry matter production and
nutrient uptake by the crop were significantly higher in these treatments followed by preemergence
application of diuron @ 1.25 kg a.i. ha-1 fb oxyfluorfen @ 0.10 kg a.i. ha-1. Preemergence
application of diuron @ 1.25 kg a.i. ha-1 fb glyphosate @ 2.5 kg a.i. ha-1 recorded
significantly higher seed cotton yield (2314 kg ha-1), net returns (` 78,508 ha-1) and
benefit:cost ratio (3.92) followed by diuron @ 1.25 kg a.i. ha-1 as pre-emergence fb
oxyfluorfen @ 0.10 kg a.i. ha-1 (2035 kg ha-1 seed cotton yield, ` 66035 ha-1 net returns and
3.48 benefit:cost ratio).
 
Date 2016-11-22T13:40:47Z
2016-11-22T13:40:47Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/86985
 
Format application/pdf
 
Publisher UAS, Dharwad