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STUDIES ON THE EFFICACY OF TRIFLURALIN AND IMAZETHAPYR FOR WEED CONTROL IN LUCERNE (Medicago sativa L.)

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Title STUDIES ON THE EFFICACY OF TRIFLURALIN AND IMAZETHAPYR FOR WEED CONTROL IN LUCERNE (Medicago sativa L.)
 
Creator MAHADEVAPPA, S G
 
Contributor BHANU MURTHY, V B
 
Subject STUDIES, EFFICACY, TRIFLURALIN, IMAZETHAPYR, WEED, CONTROL, LUCERNE
 
Description A field experiment was conducted during summer 2002 at Students
Farm, College of Agriculture, Rajendranagar, Hyderabad to study the
“Efficacy of trifluralin and imazethapyr for weed control in lucerne (Medicago
sativa L.)”. The experiment was laid out in RBD with 13 treatments and 3
replications. The treatments consisted of trifluralin @ 1.0 kg a.i.ha-1,
imazethapyr @ 0.1 or 0.2 kg a.i.ha-1 as pre emergence, early post emergence
(8 DAS) and post emergence (12 DAS), trifluralin at 1.0 kg a.i.ha-1 as PPI,
hand weeding once at 20 DAS, hand weeding twice at 20 and 40 DAS and
unweeded control.
The experimental field consisted of one sedge weed Cyperus rotundus,
three grasses and six broad leaved weeds including the volunteer weed
Crotalaria juncea; and the parasitic weed Cuscuta. Trianthema
portulacastrum was the dominant weed.
Among the different times of application of tirfluralin, pre plant
incorporation was better resulting in 79 per cent weed control efficiency
based on density and 68.3 per cent control based on weed dry weight.
Herbicide imazethapyr was more effective than trifluralin. Its
effectiveness was more distinct in the pre emergence application. Pre
emergence application of imazethapyr at 0.1 or 0.2 kg a.i. ha-1 prevented all the weeds to emerge resulting in cent per cent control except Cyperus
rotundus which was controlled to an extent of 83.3 to 87.5 per cent.
Pre emergence imazethapyr thoroughly checked the dominant weed
Trianthema portulacastrum but late applications were not equally effective on
this weed.
As observed at the time of 1st cut, WCE based on weed dry weight was
80.3 per cent with pre emergence imazethapyr at 0.2 kg a.i. ha-1 and was
comparable with the effect of hand weeding twice.
The parasitic weed cuscuta was noticed in all the control plots
uniformly because of the deliberate use of contaminated seed. In spite of two
hand weedings, there was 25 per cent infestation in the field. Pre emergence or
early post emergence application of imazethapyr either at 0.1 kg or 0.2 kg a.i.
ha-1, successfully checked the sprouting of cuscuta and the crop was totally
free of this parasitic weed upto the 1st cut (60 DAS).
There was slight phytotoxic effect of the herbicides imazethapyr and
trifluralin on lucerne crop as observed through initial crop stand, plant height
and number of branches at 20 DAS. However, these effects did not last longer.
Considering the general weed control, more importantly control of
cuscuta, growth and green fodder yield of lucerne, crude protein content of
fodder and cost effectiveness, the experimental results clearly favour the pre
emergence use of imazethapyr at 0.2 kg a.i. ha-1 in lucerne crop.
 
Date 2016-08-22T10:19:30Z
2016-08-22T10:19:30Z
2003
 
Type Thesis
 
Identifier ACHARYA N.G. AGRICULTURAL UNIVERSITY RAJENDRA NAGAR, HYDERABAD - 500 03 0
http://krishikosh.egranth.ac.in/handle/1/73237
 
Language en
 
Format application/pdf