Weed management in direct seeded summer rice
Loading...
Date
2018-08
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
OUAT
Abstract
A field experiment entitled “Weed Management in Direct Seeded Summer Rice”
was conducted during summer 2017 at Agronomy Main Research Farm, OUAT,
Bhubaneswar taking twelve weed management treatments in randomized block design
with three replication. The treatments are viz. T1-Pretilachlor @0.5kg a.i./ha (PE) 1 DAS ,
T2-Carfentrazone ethyl @ 0.025kg/ha (PoE) 15 DAS, T3–Cyhalofop butyl @ 0.1 kg/ha
(PoE) 15 DAS, T4–Flucetosulfuron ethyl @0.025 kg/ha (PoE) 15 DAS, T5-Propanil 80%
WG @ 3kg a.i./ha (PoE) 15 DAS, T6-Triafamone + ethoxysulfuron@ 0.225 kg/ha (PoE)
15 DAS, T7-Cyhalofop butyl @ 0.1 kg/ha+2,4-D@ 0.5 kg/ha (PoE) 15 DAS (Tank mix),
T8-Pretilachlor@0.5 kg/ha (PE) fb 2,4-D @ 0.5 kg/ha(PoE)15 DAS, T9–Pretilachlor@
0.5 kg/ha (PE) fb carfentrazone ethyl @ 0.025 kg/ha (PoE)15 DAS, T10– Farmers
practice (2 hand weedings at 15 and 30 DAS), T11–Weed free (4 hand weedings at 15, 30,
45 and 60 DAS), T12–Weedy check. The soil of experimental site was sandy loam in
texture with pH 5.68. The available N, P2O5 and K2O of the experimental site was 303.2,
19.70 and 240.6 kg/ha respectively. The test variety “Pratibha” was sown in lines on dt.
04.01.17 and harvested on dt. 13.05.17. The weed management Practices were imposed
as per treatments. Application of triafamone + ethoxysulfuron (PoE), recorded lower
weed density, weed dry weight throughout the cropping period which was at par with
pretilachlor (PE) fb carfentrazone ethyl (PoE). Among different chemical weed control
treatments, triafamone + ethoxysulfuron (PoE) recorded lowest weed index (WI) of 5.70
% and highest weed control efficiency (WCE) of 79.80 % at harvest followed by
pretilachlor (PE) fb carfentrazone ethyl (PoE). Weed free treatment recorded significantly
highest grain yield of 4.92 t ha-1 whereas weedy check recorded lowest grain yield (0.43
t/ha). Among different herbicidal treatments, significantly higher grain yield of 4.64 t ha-1
was obtained from application of triafamone + ethoxysulfuron (PoE) which was at par
with application of pretilachlor (PE) fb carfentrazone ethyl (PoE) with grain yield of
4.53 t ha-1, also recorded highest number of effective tillers/m2 (250), higher number of
fertile grains/panicle (75) and 1000-grains weight (24.8 g). LAI and crop growth rate also
exhibit similar trend. Highest net return of (Rs. 38,301/ha) with B:C ratio of 2.08 was
obtained from triafamone + ethoxysulfuron followed by pretilachlor (PE) fb
carfentrazone ethyl (PoE) with net return of (Rs. 35,287/ha) and. B:C ratio of 1.96.
However, application of triafamone + ethoxysulfuron (PoE) recorded lowest N, P and K
depletion (6.11, 0.75 and 7.24 kg ha-1) by weeds and highest N, P and K uptake (83.77,
21.83 and 97.60 kg ha-1) by the crop at the harvest respectively.
Description
Keywords
null