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Response of Direct Seeded Rice to Pre and Post Emergence and sowing Dates

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Title Response of Direct Seeded Rice to Pre and Post Emergence and sowing Dates
 
Creator Rajashekhar L. Rajaput
 
Contributor B.N. Aravinda Kumar
 
Subject Agronomy
 
Description A field experiment was carried out during kharif 2012 at Agricultural Research
Station, Mugad, University of Agricultural Sciences, Dharwad. The treatments consisted of
two dates of sowing (before and after onset of monsoon) and six weed control treatments
(pre-emergence (PRE) butachlor 1.5 kg/ha fb. 2 HW at 20 and 40 DAS, pretilachlor (PRE)
0.5 kg/ha fb. one intercultivation at 45 DAS, post emergence (POST) chlorimuron +
metsulfuron methyl (Almix) 4 g/ha at 17 DAS fb. one intercultivation at 45 DAS, bispyribac
sodium (POST) 25 g/ha at 17 DAS fb. one intercultivation at 45 DAS, cyhalofop butyl 0.1
kg/ha + pyrazosulfuron 0.025 kg/ha (POST) at 30 DAS fb. one intercultivation at 45 DAS
and weedy check) and two control treatments weed free and farmer practice (2 IC + 1 HW).
The experiment was laid out in a factorial RCBD with three replications.
Before onset of monsoon sowing (June 2nd) recorded significantly lower weed density
(32.3 m-2) and weed dry weight (7.89 g m-2) as compared to after onset of monsoon sowing
(June 29th) (39.0 m-2 and 8.79 g m-2, respectively) at 30 DAS. Among weed control
treatments, bispyribac sodium 25 g recorded significantly lower weed density (9.9 m-2) and
dry weight (1.72 g m-2) which was on par with butachlor 1.5 kg (13.9 m-2 and 2.01 g m-2,
respectively) at 30 DAS. Weed control index was significantly higher in these two treatments
(91.9 and 90.6, respectively) as compared to other treatments except weed free check at 30
DAS. Interaction effect was significant with respect to density of weeds at 30 DAS.
Grain yield was significantly higher in June 2nd sowing (3217 kg ha-1) as compared to
June 29th sowing (3044 kg ha-1). Among weed control treatments, bispyribac sodium 25 g and
butachlor 1.5 kg recorded a higher grain yield (4158 and 4049 kg ha-1, respectively).
However, these were on par with weed free check (4541 kg ha-1). The June 2nd sowing along
with application of bispyribac sodium 25 g resulted in significantly higher nitrogen uptake by
crop (78.32 kg ha-1) and lower by weeds (5.93 kg ha-1) and higher dehydrogenase activity
(7.29 μg TPF formed g-1 soil d-1) at 60 DAS and also this treatment resulted higher net returns
(Rs 58,419 ha-1) and B: C ratio (4.01) compared to rest of the interactions.
 
Date 2016-11-22T13:36:01Z
2016-11-22T13:36:01Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/86979
 
Format application/pdf
 
Publisher UAS, Dharwad