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STUDIES ON THE METHOD AND TIME OF APPLICATION OF SOME PROMISING HERBICIDES FOR WEED CONTROL IN GROUNDNUT (Arachis hvpo9aea L.)

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Title STUDIES ON THE METHOD AND TIME OF APPLICATION OF SOME PROMISING HERBICIDES FOR WEED CONTROL IN GROUNDNUT (Arachis hvpo9aea L.)
 
Creator Sivannarayana, G
 
Contributor Bhanumurthy, V.B
 
Subject Studies,method,time,application,promising herbicides,weed control,groundnut
 
Description Two experiments were conducted during Kharif, 1988
and one during summer, 1988-89 to findout the most effective
chemical weed control practice for groundnut using some of
the available herbicides. During Kharif, 88, in one experiment
four herbicides (fluchloralin, pendimethalin, 2,4-D EE
and alachlor) were tested in main plots with their time and
method of application (PPI, Preemergence spray, early postemergence
spray and with soil} treatments as subplots. In another
experiment, fluchloralin was tested for preemergence as well
as early post emergence use and was applied using sand, soil,
urea, and water as carriers. Its early postemergence spray
was incorporated by way of star weeding. All these treatments
were compared with preplant incorporation (P.PI) of fluchloralin,
hand weeding twice, star weeding twice and unweeded check.
Keeping the observations of the above trials in view, the
experiment for summer 188-89 was formulated. The treatments
included preemergence use of fluchloralin with soil and its
PPI, preemergence spray of pendimethalin, d~rected spray of
2, 4-D EE as early postemergence and its split application
(pre+early post) and different treatments of alachlor such
as PPI, premergence use w1 th water and soil, early postemergence
spray· and aplit application (pre+early post). These
were compared with hand weeded and unweeded checks.
Results of experiment-I revealed that PPI and preemergence
spray of fluchloralin and pendimethalin were effect! ve on grasses
but showed little effect on sedges. Early postemergence
spray of 2,4-D EE was effective on sedges, but weed shift
occurred to g~asses. The crop was sensitive to 2, 4-D EE and so,
growth and pod yields were effected. Alachlor, particularly
under PPI, was highly effective on both grasses and sedges and
was safe ~ the crop, resulting in higher pod yields and net
returns. The increase in yield was by 78.6 per cent over
control. Study on the use of carriers (experiment-II) showed
that soil can be effectively used fbr the preemergence application
of fluchloralin. It checked the growth of grasses
similar to PPI and premettgence spray and in add! tion, was
effective on sedges too. Sand, urea and water as carriers
caused sindlar effect as that of PPI and the weed control with
all these paactices was on par ~ that under star weeding twice.
Fluchloralin was not suitable for early postemergence use and
carriers showed no mo~fying effect. Hand weeding improved the
pod yields by 88.3 per cent over control, while preemergence
fluchloralin with soil as carrier caused 76.0 per cent increase.
The net returns were higher with the latter.
Most of the above observations were verfied from the trial
conducted during summer, 88-89. Preemergence application of
fluchloralin with soil was as effective as its PPI. Directed
spray of early postemergence 2, 4-D EE controlled Cyperus
rotundus, , but lowered the pod yields. PPI of alachlor was the
most effective chemical weed control practice, closely followed
by its early postemergence spray or split application. Chemical
weed control resulted in higher net returns compared to hand
weeding. The results suggested the use of alachlor as PPI for
effective weed control in groundnut.
 
Date 2016-08-17T10:23:32Z
2016-08-17T10:23:32Z
1989
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/72684
 
Language en
 
Relation D3360;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD.