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Weed management in onion - chilli - cotton relay intercropping rainfed vertisols

KrishiKosh

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Title Weed management in onion - chilli - cotton relay intercropping rainfed vertisols
 
Creator Rajkumara.S.
 
Contributor Y.B.Palled
 
Subject Agronomy
 
Description Two field experiments were conducted during 2005-07 to study the effect of weed free
periods and weed management practices in onion – chilli – cotton relay intercropping in rainfed
Vertisols.
Weed free period up to 120 DAS significantly reduced the number and dry weight of
weeds and was on par with weed free check. Significantly higher bulb yield and chilli fruit yield
was recorded in weed free check (135.06 and 10.91 q/ha respectively) and were on par with
weed free up to 100 DAS (112.99 q/ha and 8.84 q/ha respectively). Unweeded check recorded
lower bulb and fruit yield. Weed free between 40 – 120 DAS recorded significantly higher seed
cotton yield (344.60 kg/ha) and was on par with weed free up to 120 DAS (180.80 kg/ha). Weed
free up to 120 DAS recorded higher B:C ratio (4.60) for the system and was on par with weed
free check (5.11).
Pre emergent application pendimethalin @ 1.0 kg a.i./ha was safe on onion and chilli
while, oxyfluorfen @ 0.15 kg a.i./ha and oxadiargyl @ 0.09 kg a.i./ha were phytotoxic.
Herbicides reduced the number and dry weight of weeds significantly. Oxyfluorfen recorded
higher weed control efficiency. Bulb yield (100.5 q/ha) and fruit yield (9.41 q/ha) obtained in
pendimethalin with four weeding were on par with weed free check (114.07 and 12.99 q/ha
respectively). Seed cotton yield was higher in oxyfluorfen three hand weedings (276.9 kg/ha)
and was on par with farmer’s practice (253.74 kg/ha) and higher than weed free check (73.76
kg/ha). Pendimethalin with hand weeding at 20, 40, 60 and 80 DAS recorded higher net returns
(Rs. 64,390/ha) and B:C ratio (3.99) and was on par with weed free check and farmer’s practice
for the onion – chilli – cotton relay intercropping.
 
Date 2016-07-23T09:30:58Z
2016-07-23T09:30:58Z
2009
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69458
 
Format application/pdf
 
Publisher UAS Dharwad