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INTEGRATED WEED MANAGEMENT IN CASTOR ( Ricinus communis L.)

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Title INTEGRATED WEED MANAGEMENT IN CASTOR ( Ricinus communis L.)
 
Creator LAKSHMI SUJATHA, CH
 
Contributor VENKATA REDDY, V
 
Subject weeds, control methods, crops, developmental stages, herbicides, yields, organic compounds, land resources, productivity, castor (genus)
 
Description A field experiment was conducted on sandy loam
soil of medium fertility status at Agricultural college
farm, Rajendranagar, during Kharif 1991 with a view to
find out suitable weed management system in castor crop.
The experiment was laid out in randomised block
design with fourteen treatments each replicated thrice.
ThP. herbicides included two pre emel;;ience herbicides,
pendimethalin and metolachlor (each@ 1.0 kg ha-l and
1.5 kg ha-1 >, two post emergence herbicides, paraquat .
and glyphosate C @ 0.5 kg ha-1 and 1.0 kg ha-1
respectively) as directed spray at 21 DAS. The weed
management systems consisted of herbicidal application
as pre emergence and at ground cracking stage, pre
emergence herbicide followed by post emergence
herbicide, pre emergence herbicide at different stages
followed by hand weeding at 30 DAS, hand weeding at 30,
60 DAS and unweeded control. At 30 DAS~ lowest weed density, lowest
drymatter accumalation, lowest weed index and highest
weed control efficiency and highest herbicidal
efficiency index was obtained with -~re emergence
application of metolachlor@ 1.0 kg ha followed by
glyphosate @ 1.0 kg ha-1 • Similar trend was noticed at
60, 90, 120 DAS and at harvest.
The herbicides used in the present
investigation did not effect the germination of
castor and no phytotoxic symptoms were noticed with
the weed management systems.
The drymatter production of castor at 30, 60,
90, 120 DAS and at harvest was significantly ighest
with application of metolachlor@ 1.0 kg ha-1 followed
by glyphosate @ 1.0 kg ha-1 and was on par with the
treatment which included the application of
pendimethalin@ 1.0 kg ha-1 followed by glyphosate@ 1.0
kg ha-1 •
Yield components viz., no.of spikes, 1000 seed
weight, number of capsules were higher with application
of pre emergence herbicide followed· by post emergence
herbicide.
Higher seed yields were reported in weed
management treatments involving pre emergence herbicide
followed by either post emergence herbicide or hand
weeding.Significantly higher seed yields were reported
with application of metolachlor@ 1.0 kg ha-1 followed
by glyphosate@ 1.0 kg ha-l treatment.
Higher uptake of N, P and K by castor was
obtained with pre emergence application of metolachlor
@ 1.0 kg ha-1 followed by glyphosate @ 1.0 kg ha-l
metolachlor followed by hand weeding. Weeds recorded
maximum uptake of N, P and K throughout the crop period
in unweeded control, while minimum uptake of N, P and K
by weeds was recorded with metolachlor followed by hand
weeding and pendimethalin followed by hand weeding and
metolachlor followed by glyphosate.Herbicide residue studies using cucumber
indicated the non residual nature of the herbicides used
in the present investigation.
 
Date 2017-01-20T10:17:47Z
2017-01-20T10:17:47Z
1992
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/97249
 
Language en
 
Relation D3938;
 
Format application/pdf
 
Publisher ANDHRA PRADESH AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD