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EVALUATION OF LOW DOSE HERBICIDES IN TRANSPLANTED RICE (Oryza sativa L.)

KrishiKosh

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Title EVALUATION OF LOW DOSE HERBICIDES IN TRANSPLANTED RICE (Oryza sativa L.)
 
Creator UMA, G
 
Contributor VENKATA RAMANA, M
 
Subject EVALUATION, LOW, DOSE, HERBICIDES, TRANSPLANTED, RICE
 
Description A field experiment entitled “Evaluation of low dose herbicides in transplanted rice
(Oryza sativa L.)” was conducted at College farm, Rajendranagar, Hyderabad, during
kharif, 2011. The experiment was laid out in randomized block design, replicated thrice
with 12 treatments viz., T1- Pyrazosulfuron-ethyl (10% WP) @ 25 g a.i. ha-1 as pre-
emergence application + HW at 40 DAT, T2- Bensulfuron-methyl 0.6% + Pretilachlor 6%
@ 10 kg granules ha-1 as pre-emergence application + HW at 40 DAT, T3- Bispyribac
sodium (10% SC) @ 25 g a.i. ha-1 as post emergence application at 20 DAT, T4-Almix
(Metsulfuron-methyl 10% + Chlorimuron ethyl 10-20% WP) @ 4 g a.i. ha-1 as post
emergence at 20 DAT, T5- Pyrazosulfuron ethyl @ 25 g a.i. ha-1 as pre-emergence +
Bispyribac sodium @ 25 g a.i. ha-1 at 20 DAT, T6- Pyrazosulfuron ethyl as pre-emergence
@ 25 g a.i. ha-1 fb Almix @ 4 g a.i. ha-1 at 20 DAT, T7- Bensulfuron-methyl 0.6% +
Pretilachlor 6% @ 10 kg granules ha-1 as pre-emergence fb Bispyribac sodium @ 25 g a.i.
ha-1 at 20 DAT, T8- Bensulfuron-methyl 0.6% + Pretilachlor 6% @ 10 kg granules ha-1 as
pre-emergence fb Almix @ 4 g a.i. ha-1 at 20 DAT, T9- Butachlor (50% Granules) @ 1.5
kg a.i. ha-1 as pre-emergence fb HW at 40 DAT, T10- Two Hand Weedings at 20 and 40
DAT, T11- Two mechanical weedings at 20 and 40 DAT and T12- Weedy check with three
replications.
The experimental field was infested by grasses, sedges and broad leaved weeds.
Among the species, grasses viz., Echinocloa crusgalli, Panicum repens, Cynodon dactylon,
Sedges viz., Cyperus rotundus, Cyperus difformis and broad leaved weeds viz., Eclipta
alba, Ammania baccifera were seen through out the ontogeny of the crop. Among the
different types of weeds grasses like Echinocloa colonum sedges like Cyperus difformis,
Cyperus iria and broad leaved weeds like Eclipta alba were found dominant during active
and maximum tillering stages of the crop. Among these grasses were dominant followed by
sedges and broad leaved weeds.
Hand weeding at 20 and 40 DAT recorded lowest weed density, weed dry matter and
nutrient uptake and highest weed control efficiency compared to other treatments at all the
stages of crop growth. Among the herbicidal treatments application of Bensulfuron-methyl
0.6% + Pretilachlor 6% @ 10 kg granules ha-1 as pre-emergence application + HW at 40
DAT followed by Bensulfuron-methyl 0.6% + Pretilachlor 6% @ 10 kg granules ha-1 as
pre-emergence + Bispyribac sodium @ 25 g a.i. ha-1 at 20 DAT were the best treatments in
terms of checking weed growth.
With respect to the effect of different weed control treatments on rice crop, it was
found that plant height, tillers m-2, dry matter production, panicles m-2 and filled grains per
panicle were significantly higher with Hand weeding twice at 20 and 40 DAT than all other
treatments. The next best treatment was Bensulfuron-methyl 0.6% + Pretilachlor 6% @ 10
kg granules ha-1 as pre-emergence application + HW at 40 DAT followed by Bensulfuron-
methyl 0.6% + Pretilachlor 6% @ 10 kg granules ha -1 as pre-emergence + Bispyribac
sodium @ 25 g a.i. ha-1 at 20 DAT.
Hand weeding treatment at 20 and 40 DAT resulted in significantly higher grain (5580
kg ha-1) and straw (6464 kg ha-1) yields and nutrient uptake over all other treatments.
Among herbicidal treatments Bensulfuron-methyl 0.6% + Pretilachlor 6%) @ 10 kg
granules ha-1 as pre-emergence application fb HW at 40 DAT and Bensulfuron-methyl
0.6% + Pretilachlor 6% @ 10 kg granules ha -1 as pre-emergence fb Bispyribac sodium @
25 g a.i. ha-1 at 20 DAT proved efficient in recording higher weed control efficiency, grain
and straw yields and better weed index values.
In terms of economics, highest net returns (Rs 33,189 ha-1) and benefit cost ratio
(1.40) were obtained with Bensulfuron-methyl 0.6% + Pretilachlor 6% @ 10 kg granules
ha-1 as pre-emergence fb Bispyribac sodium @ 25 g a.i. ha-1 at 20 DAT followed by
Bensulfuron-methyl 0.6% + Pretilachlor 6% @ 10 kg granules ha -1 as pre-emergence fb
HW at 40 DAT (32,379) and benefit cost ratio (1.30) compared to that of two hand
weedings (Rs. 31,952 ha-1) and benefit cost ratio (1.17) , least being with unweeded check
net returns (Rs.7,411 ha-1) and benefit cost ratio (0.37).
 
Date 2016-06-29T13:52:20Z
2016-06-29T13:52:20Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/68236
 
Language en
 
Relation D9187;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY