Record Details

INTEGRATED WEED MANAGEMENT IN KHARIF MAIZE ( Zea mays L. )

KrishiKosh

View Archive Info
 
 
Field Value
 
Title INTEGRATED WEED MANAGEMENT IN KHARIF MAIZE ( Zea mays L. )
 
Creator SREENIV AS, G
 
Contributor SATYAHARAYANA, V
 
Subject biological phenomena, proteins, dna, livestock, diseases, recombination, viruses, genes, productivity, enzymes
 
Description field experiment entitled "Integrated weed
management in kharif maize (Zea may~ L.)" was conducted
on sandy loam soil of medium fertility status at the
Agricultural College Farm, Rajendranagar, Hyderabad
during kharif, 1991. The experiment was laid out in a
randomised block design replicated thrice with fourteen
treatments. The herbicides were three pre-emergence
herbicides viz., atrazine~1pendimethalin and oxyfluorfen
(@1.5, 1.5 and 0.2 kg ha ,respectively) and two postemergence
herbicides yiz., 2,4-P Na salt and glyphosate
(@0.5 and 1.0 kg ha ). The weed management systems
consisted of application of pre-emergence herbicide
alone, pre-emergence herbicide followed by herbicide (2,4-D Na salt at 30 DAS and
glyphosate at 42 DAS), pre-emergence herbicide followed
by intercultivation at 30 DAS. Farmers practice (intercultivation
at 20 DAS fb hand weeding at 30 DAS) and
unweeded check were also included. The germination of crop was not affected by any
of the treatment under study. However, oxyfluorfen
showed temporary phytotoxicity on maize crop which
recovered after 30 days. The drymatter production of
the crop at 3Q1DAS was significantly more with . atrazine
@ 1.5 kg ha and at the other stages, with atrazine
followed by 2,4-D Na salt, closely followed by atrazine
followed by glyphosate compared to other treatments. At 30 DAS, lowest weed density, as well as weed
drymatter production and the highest weed control efficiency
were obtained_Jith pre-emergence application of
atrazine @ J·5Jcg ha alone and the lowest weed drymatter
an~etif control efficiency were recorded at all
otheYstages under farmer's practice. The highest integrated
weed management index and herbicidal efficiency
index were found with atrazine following by 2,4-D Na
salt treatment. Herbicidal treatments and farmer's
p~~ctice showed lower uptake of nitrogen, phosphorus
and potassium by weeds over unweeded check.
_1 Yield components _yiz., number of seed_1rows
cob , number of seeds row , number of seeds cob and
100 grain weight were higher with pre-emergence application
of atrazine followed by 2,4-D Na salt, closely
followed by atrazine followed by glyphosate than with
other treatments, including farmer's practice.
Herbicide treatments significantly influenced
grain yield, stover yield and harvest index of maize
crop. Weed management systems involving application of
atrazine followed by 2,4-D Na salt, and atrazine
followed by glyphosate resulted in 66.6 and 63.0 per
cent more grain yield over unweeded check.
Higher uptake of N, P and K by maize crop was
obtained with application of atrazine followed by 2,4-D
Na salt, and atrazine followed by glyphosate than other
treatments. Herbicide residue studies using greengram
indicated that none of the herbicide ~eatments had
left any residues in the soil to aff~ct the field
emergence and growth of succeeding greengram crop.
Economic analysis showed that the treatment atrazine
followed by 2,4-D Na salt (post-em), and atrazine
followed by glyphosate gave higher monetary returns
compared to farmer's practice and unweeded check The
net profit obtained with atrazine followed by 2,4-D Na
salt was more compared to farmer's practice and
unweeded check.
 
Date 2017-01-20T10:10:01Z
2017-01-20T10:10:01Z
1992
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/97244
 
Language en
 
Relation D3934;
 
Publisher ANDHRA PRADESH AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD