BIO-EFFICACY OF HERBICIDE COMBINATIONS FOR WEED MANAGEMENT IN DRY DIRECTSEEDED RICE (Oryza sativa L.)
| dc.contributor.advisor | Dhanapal, G. N. | |
| dc.contributor.author | NAGARJUN, P. | |
| dc.date.accessioned | 2020-10-03T09:52:43Z | |
| dc.date.available | 2020-10-03T09:52:43Z | |
| dc.date.issued | 2018-10-10 | |
| dc.description.abstract | A field experiment entitled “Bio-efficacy of herbicide combinations for weed management in dry direct-seeded rice (Oryza sativa L.)” was conducted during kharif 2016 and 2017 at Main Research Station, University of Agricultural Sciences, Hebbal, Bengaluru, involving twelve treatments laid out in RCBD design with three replications using MAS 946-1 variety. The treatments comprised of nine pre- and post-emergence herbicide combinations, hand weeding, mechanical weeding and weedy check. Major weeds observed were Cyperus rotundus, Cynodon dactylon, Commelina benghalensis and Alternanthera sessilis. Pooled analysis indicated that hand weeding at 20, 40 and 60 DAS recorded highest grain (5.50 t ha-1 ) and straw yield (7.22 t ha-1 ) and it was on par with bensulfuron methyl + pretilachlor fb bispyribac sodium (5.39 and 7.16 t ha-1 , respectively) and bensulfuron methyl + pretilachlor fb triafamone + ethoxysulfuron (5.29 and 7.03 t ha-1 , respectively). Significantly lower total weed density, dry weight and weed index was recorded in hand weeding at 20, 40 and 60 DAS (17.7 m-2 , 4.3 g m-2 and 0.00, respectively) followed by bensulfuron methyl + pretilachlor fb bispyribac sodium (19.8 m-2 , 4.6 g m-2 and 2.11 %, respectively) whereas, it was significantly higher in weedy check (108.2 m-2 , 35.8 g m-2 and 74.49 %, respectively).The higher net returns and benefit cost ratio was achieved in bensulfuron methyl + pretilachlor fb bispyribac sodium (Rs. 59,275 ha-1 and 2.93, respectively) closely followed by bensulfuron methyl + pretilachlor fb triafamone + ethoxysulfuron (Rs. 57,533 ha-1 and 2.88, respectively) without any phytotoxicity on rice crop. Unweeded control recorded significantly lower grain yield (1.40 t ha-1 ), straw yield (2.32 t ha-1 ), lower net returns (Rs.-1,912 ha-1 ), lower B:C ratio (0.93). Considering the present labour scarcity and drudgery, herbicides combination was found to be efficient weed management strategy for rice cultivation in dry-direct seeded situations along with least effect on soil microflora and residual black gram crop. | en_US |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810152276 | |
| dc.keywords | Cyperus rotundus, Cynodon dactylon, Commelina benghalensis and Alternanthera sessilis. P | en_US |
| dc.language.iso | English | en_US |
| dc.pages | 265 | en_US |
| dc.publisher | UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU | en_US |
| dc.sub | Agronomy | en_US |
| dc.theme | BIO-EFFICACY OF HERBICIDE COMBINATIONS | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | BIO-EFFICACY OF HERBICIDE COMBINATIONS FOR WEED MANAGEMENT IN DRY DIRECTSEEDED RICE (Oryza sativa L.) | en_US |
| dc.type | Thesis | en_US |