Record Details

INTEGRATED WEED MANAGEMENT WITH LOW VOLUME HERBICIDES IN SWEET CORN

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Title INTEGRATED WEED MANAGEMENT WITH LOW VOLUME HERBICIDES IN SWEET CORN
 
Creator SANDHYA RANI, B
 
Contributor KARUNA SAGAR, G
 
Subject weeds, control methods, plant oils, drying, confectionery, vegetables, yields, crops, grasses, maize
 
Description A field experiment was conducted during rabi, 2008 of wetland farm of
S.V. Agricultural College, Tirupati campus of the Acharya N.G. Ranga
Agricultural University to study the effect of “Integrated weed management
with low volume herbicides in sweet corn”.
The experiment was laid out in a randomized block design with three
replications. There were twelve treatments viz., pre-emergence application of
sulfosulfuron @ 30 g a.i. ha-1 (T1), imazethapyr @ 50 g a.i. ha-1 as preemergence
(T2), sulfosulfuron @ 15 g a.i. ha-1 + imazethapyr @ 25 g a.i. ha-1
as pre-emergence (T3), sulfosulfuron @ 30 g a.i. ha-1 as pre-emergence + hand
weeding at 40 DAS (T4), imazethapyr @ 50 g a.i. ha-1 as pre-emergence +
hand weeding at 40 DAS (T5), sulfosulfuron @ 15 g a.i. ha-1 + imazethapyr @
25 g a.i. ha-1 as pre-emergence with hand weeding at 40 DAS (T6), hand
weeding once at 20 DAS (T7), hand weeding once at 40 DAS (T8), hand
weeding twice at 20 and 40 DAS (T9) and control (T10).
Weed flora belonging to thirteen taxonomic families were observed in
the experimental field, of which four species were grasses, one species was
sedge and fifteen species were broad leaved weeds (BLWs). The predominant
weed species noticed were Digitaria sanguinalis, Cyperus rotundus,
Borreria hispida, Cleome viscosa, Corchorus olitorius, Merrimia aegyptia
and Trichodesma indicum.
The lowest density and dry weight of total weeds as well as category
wise (grasses, sedges and BLW) were recorded with hand weeding twice at
20 and 40 DAS (T9), which was however, comparable with sulfosulfuron
@ 15 g a.i. ha-1 + imazethapyr @ 25 g a.i. ha-1 as pre-emergence with HW at
40 DAS (T6) and significantly lesser than pre-emergence application of
sulfosulfuron @ 30 g a.i. ha-1 + hand weeding at 40 DAS (T4) and
imazethapyr @ 50 g a.i. ha-1 as pre-emergence + hand weeding at 40 DAS
(T5), with significant disparity between them. Control (T10) recorded the
highest values of weed density and dry matter. The highest weed control
efficiency was noticed with hand weeding twice at 20 and 40 DAS (T9),
which was in parity with sulfosulfuron @ 15 g a.i. ha-1 + imazethapyr @ 25 g
a.i. ha-1 as pre-emergence with hand weeding at 40 DAS (T6).
Growth parameters of sweet corn viz., plant height, leaf area index and
dry matter production were highest with hand weeding twice at 20 and
40 DAS (T9), which were however, comparable with sulfosulfuron +
imazethapyr as pre-emergence with hand weeding at 40 DAS (T6) and
significantly superior to pre-emergence application of sulfosulfuron @ 30 g
a.i. ha-1 + hand weeding at 40 DAS (T4), followed by sulfosulfuron @ 15 g
a.i. ha-1 + imazethapyr @ 25 g a.i. ha-1 as pre-emergence (T3). All the growth
parameters were found to be lowest with control (T10), at all the stages of crop
growth.
Hand weeding twice at 20 and 40 DAS (T9) produced enhanced level of
yield attributes viz., number of cobs plant-1, cob length and girth, number of
kernel rows cob-1, number of kernels cob-1 and kernel weight, which were
comparable with those obtained with sulfosulfuron @ 15 g a.i. ha-1 +
imazethapyr @ 30 g a.i. ha-1 as pre-emergence with hand weeding at 40 DAS
(T6). The lowest values of all the yield attributes were associated with
control (T10).
The highest yield of green cob as well as green fodder were recorded
with hand weeding twice at 20 and 40 DAS (T9), which were comparable with
sulfosulfuron @ 15 g a.i. ha-1 + imazethapyr @ 25 g a.i. ha-1 as pre-emergence
with hand weeding at 40 DAS (T6) and significantly superior to rest of the
treatments. Control (T10) resulted in the lowest yields of green cob as well as
green fodder.
Net returns and benefit cost ratio were highest with sulfosulfuron
@ 15 g a.i. ha-1 + imazethapyr @ 25 g a.i. ha-1 as pre-emergence with hand
weeding at 40 DAS (T6), which were however, on par with hand weeding
twice at 20 and 40 DAS (T9) and significantly superior to sulfosulfuron
@ 30 g a.i. ha-1 as pre-emergence + hand weeding at 40 DAS (T4), where as
control (T10), resulted in the lowest economic returns.
The above results revealed that sulfosulfuron @ 15 g a.i. ha-1 +
imazethapyr @ 25 g a.i. ha-1 as pre-emergence with hand weeding at 40 DAS
(T6) was found to be effective and economic weed management practice,
considering the economic returns, for sweet corn during rabi on sandy loam
soils.
 
Date 2016-06-24T11:53:43Z
2016-06-24T11:53:43Z
2009
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67914
 
Language en
 
Relation D8701;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY