Response of Direct Seeded Rice to Pre and Post Emergence and sowing Dates
KrishiKosh
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Title |
Response of Direct Seeded Rice to Pre and Post Emergence and sowing Dates
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Creator |
Rajashekhar L. Rajaput
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Contributor |
B.N. Aravinda Kumar
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Subject |
Agronomy
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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. |
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Date |
2016-11-22T13:36:01Z
2016-11-22T13:36:01Z 2013 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/86979
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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