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EVALUATION OF NEW POST EMERGENCE HERBICIDES IN TRANSPLANTED RICE

KrishiKosh

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Title EVALUATION OF NEW POST EMERGENCE HERBICIDES IN TRANSPLANTED RICE
 
Creator VANAJA, THOTA
 
Contributor SRINIVASULU, K
 
Subject weeds, control methods, rice, herbicides, developmental stages, yields, crops, planting equipment, grain, drying
HERBICIDES, TRANSPLANTED RICE
 
Description A field experiment entitiled “Evaluation of new post-emergence herbicides in
transplanted rice” was conducted during Kharif 2009 on sandy clay loam soil of
Agricultural College Farm, Bapatla, Guntur district, Andhra Pradesh. The experiment
was laid out in a randomized block design and replicated four times with eight
treatments comprising of T1:
Weedy check; T2:
Hand weeding at 20 and 40
DAT; T3: Oxadiargyl 80 WP @ 100 g a.i. ha-1 at 3 to 5 DAT; T4 Bispyribac sodium
10 SC @ 30 g a.i. ha-1 at 20 DAT; T5: Azimsulfuron 50 DF @ 30 g a.i. ha-1 at 20
DAT; T6: Penoxsulam 24 SC @ 20 g a.i. ha-1 at 20 DAT; T7:
2,4-D amine salt 58
SL @ 0.58 kg a.i. ha-1 at 20 DAT; T8: Pyrazosulfuron ethyl 10 WP @ 20 g a.i. ha-1
at 20 DAT.
The results of the investigation revealed that pre-emergence application of
oxadiargyl 80 WP @ 100 g a.i. ha-1 (T3) applied at 4 DAT recorded lowest weed dry
matter at 20 DAT. Hand weeding at 20 and 40 DAT (T2) was on a par with
emergence application of oxadiargyl 80 WP @ 100 g a.i. ha-1 at 4 DAT (T3).
pre-
Hand weeding at 20 and 40 DAT (T2) recorded significantly higher weed
control efficiency over all other pre and post-emergence herbicides at all crop growth
stages, except at 20 DAT, whereas pre-emergence application of oxadiargyl 80 WP
@ 100 g a.i. ha-1 at 4 DAT (T3) rerecorded highest weed control efficiency at 20
DAT.
All growth parameters such as plant height, number of tillers per m-2, and
drymatter accumulation by crop measured at different growth stages were
significantly affected by the weed management treatments.
Consistently better
growth was observed at all the stages with hand weeding at 20 and 40 DAT (T2)
except at 20 DAT. At all other stages hand weeding at 20 and 40 DAT (T2) recorded
highest plant height followed by pre-emergence application of oxadiargyl 80 WP @
100 g a.i. ha-1 (T3) and there was no significant difference among all other herbicides
which were on a par with each other throughout the crop growth period.
The highest drymatter accumulation by rice crop was registered with hand
weeding (T2) followed by penoxsulam 24 SC @ 20 g a.i. ha-1 (T6) at all the stages of
crop growth, except at 20 and 80 DAT, where oxadiargyl 80 WP @ 100 g a.i. ha-1 at 4
DAT recorded the highest plant drymatter at 20 DAT and hand weeding at 20 and 40
DAT (T2) recorded highest drymatter by rice crop at 80 DAT.
The differences observed in growth parameters among the treatments studied
also reflected the trend with that of yield attributes.
The number of productive tillers m-2 observed with bispyribac sodium 10 SC
@ 30 g a.i. ha-1 was markedly higher than the weedy check. However, the number of
productive tillers m-2 observed with various herbicides were comparable with that of
hand weeding.
Maximum number of filled grains per panicle were observed with the hand
weeding at 20 and 40 DAT. The number of grains per panicles observed with the
penoxsulam 24 SC @ 20 g a.i. ha-1 and oxadiargyl 80 WP @ 100 g a.i. ha-1 were
markedly higher than that of weedy check.
The grain and straw yields observed with oxadiargyl 80 WP @ 100 g a.i. ha-1
and penoxsulam 24 SC @ 20 g a.i. ha-1 were comparable with hand weeding at 20
and 40 DAT, which recorded the highest grain (6227 kg ha-1) and straw (7331
kg ha-1) yields.
Highest net returns (Rs. 48183 ha-1) was recorded with the post-emergence
application of penoxsulam 24 SC @ 20 g a.i. ha-1 followed by pre-emergence
application of oxadiargyl 80 WP @ 100 g a.i. ha-1.
Thus, the present investigation clearly indicated that post-emergence
application of penoxsulam 24 SC @ 20 g a.i. ha-1 at 20 DAT (T6) or pre-emergence
application of oxadiargyl 80 WP @ 100 g a.i. ha-1 at 4 DAT (T3) were found to be
effective in controlling weeds and increased rice productivity as well as economic
returns in transplanted rice.
 
Date 2016-06-03T09:30:23Z
2016-06-03T09:30:23Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66677
 
Language en
 
Relation D9018;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY