Weed management in dry-seeded rice through integration of tillage, cultural practices and herbicides

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dc.contributor.advisorBhullar, Makhan Singh
dc.contributor.advisorBhullar, Makhan Singh
dc.contributor.advisorBhullar, Makhan Singh
dc.contributor.authorManpreet Singh
dc.contributor.authorManpreet Singh
dc.contributor.authorManpreet Singh
dc.date.accessioned2019-05-01T08:59:41Z
dc.date.available2019-05-01T08:59:41Z
dc.date.issued2019
dc.date.issued2019
dc.date.issued2019
dc.description.abstractThe study “Weed management in dry-seeded rice through integration of tillage, cultural practices and herbicides”, consisting of two field experiments was carried out in summer seasons of 2017 and 2018. Both experiments were conducted in split-plot design and replicated thrice. Exp. I, conducted during 2017 and 2018 at Ludhiana, had combination of two tillage systems (zero tillage, ZT); conventional tillage, CT) & two rice varieties (PR 124, PR 126) in main-plots and four weed control treatments viz. weedy; herbicides (pendimethalin plus pyrazosulfuron as pre- followed by (fb) bispyribac sodium as post-emergence); IWM (pendimethalin plus pyrazosulfuron as pre- fb bispyribac sodium as post-emergence fb hand weeding at 40 days after sowing) and weed free in sub-plots. Dry-seeded rice (DSR) raised under CT had lower infestation of grass weeds, higher infestation of sedge and broadleaf weeds, and it gave significantly higher grain yield (38-51%) than rice raised under ZT. PR 126 had more weed smothering potential and gave significantly higher grain yield than PR 124 under both tillage systems. PR 126, raised under CT and weed free conditions, gave highest rice grain yield (5.67-6.87 t ha-1), however, the highest economic returns (55873 Rs ha-1) were recorded under combination of PR 126, CT and IWM. CT and IWM had significant depletion of soil seedbank of grass weeds than ZT and herbicides alone, respectively. Exp. II, conducted in 2017 at Ludhiana and in 2018 at Ludhiana and Moga, had combinations of two green manure (without green manure i.e. conventional, CON); with Crotalaria juncea green manure (GM) & three N levels (120, 150, 180 kg N ha-1) in main-plots and three weed control treatments viz. (weedy; herbicides and IWM) in sub-plots. Soil organic carbon status and level of weed infestation influenced DSR response to green manure, N and weed control. Under low soil organic carbon (0.36%) and high level of weed infestation (at Ludhiana), rice grain yield losses due to weed competition were 60-70%. Green manure and N favored weeds more than crop. Rice responded up to 120 kg N in GM and up to 150 kg N ha-1 in CON. Integration of pre- and post-emergence herbicides with one hand weeding provided significantly higher level of weed control and grain yield than use of herbicides alone. Combination of CON, 180 kg N ha-1 and IWM gave the highest net returns (39426 Rs ha-1), however, combination treatment of CON, 180 kg N ha-1 and herbicides gave the highest B:C (2.33:1). After two years, soil seedbank of grass weeds was enhanced by GM than CON, 180 kg N than 120 kg N ha-1 and weedy check than herbicides. GM improved soil organic carbon. Under high soil organic carbon (0.67%) and low level of weed infestation (at Moga), weeds reduced rice yield up to 14% only. Rice responded up to 120 kg N in GM and up to 150 kg N ha-1 in CON. Pre- and post-emergence herbicides alone and their integration with one hand weeding provided similar level of weed control and rice grain yield. After one year, green manure and N had no effect on soil seedbank of Echinochloa colona, while herbicides use reduced seedbank than weedy check; GM had no effect on soil organic carbon.en_US
dc.description.abstractThe study “Weed management in dry-seeded rice through integration of tillage, cultural practices and herbicides”, consisting of two field experiments was carried out in summer seasons of 2017 and 2018. Both experiments were conducted in split-plot design and replicated thrice. Exp. I, conducted during 2017 and 2018 at Ludhiana, had combination of two tillage systems (zero tillage, ZT); conventional tillage, CT) & two rice varieties (PR 124, PR 126) in main-plots and four weed control treatments viz. weedy; herbicides (pendimethalin plus pyrazosulfuron as pre- followed by (fb) bispyribac sodium as post-emergence); IWM (pendimethalin plus pyrazosulfuron as pre- fb bispyribac sodium as post-emergence fb hand weeding at 40 days after sowing) and weed free in sub-plots. Dry-seeded rice (DSR) raised under CT had lower infestation of grass weeds, higher infestation of sedge and broadleaf weeds, and it gave significantly higher grain yield (38-51%) than rice raised under ZT. PR 126 had more weed smothering potential and gave significantly higher grain yield than PR 124 under both tillage systems. PR 126, raised under CT and weed free conditions, gave highest rice grain yield (5.67-6.87 t ha-1), however, the highest economic returns (55873 Rs ha-1) were recorded under combination of PR 126, CT and IWM. CT and IWM had significant depletion of soil seedbank of grass weeds than ZT and herbicides alone, respectively. Exp. II, conducted in 2017 at Ludhiana and in 2018 at Ludhiana and Moga, had combinations of two green manure (without green manure i.e. conventional, CON); with Crotalaria juncea green manure (GM) & three N levels (120, 150, 180 kg N ha-1) in main-plots and three weed control treatments viz. (weedy; herbicides and IWM) in sub-plots. Soil organic carbon status and level of weed infestation influenced DSR response to green manure, N and weed control. Under low soil organic carbon (0.36%) and high level of weed infestation (at Ludhiana), rice grain yield losses due to weed competition were 60-70%. Green manure and N favored weeds more than crop. Rice responded up to 120 kg N in GM and up to 150 kg N ha-1 in CON. Integration of pre- and post-emergence herbicides with one hand weeding provided significantly higher level of weed control and grain yield than use of herbicides alone. Combination of CON, 180 kg N ha-1 and IWM gave the highest net returns (39426 Rs ha-1), however, combination treatment of CON, 180 kg N ha-1 and herbicides gave the highest B:C (2.33:1). After two years, soil seedbank of grass weeds was enhanced by GM than CON, 180 kg N than 120 kg N ha-1 and weedy check than herbicides. GM improved soil organic carbon. Under high soil organic carbon (0.67%) and low level of weed infestation (at Moga), weeds reduced rice yield up to 14% only. Rice responded up to 120 kg N in GM and up to 150 kg N ha-1 in CON. Pre- and post-emergence herbicides alone and their integration with one hand weeding provided similar level of weed control and rice grain yield. After one year, green manure and N had no effect on soil seedbank of Echinochloa colona, while herbicides use reduced seedbank than weedy check; GM had no effect on soil organic carbon.en_US
dc.description.abstractThe study “Weed management in dry-seeded rice through integration of tillage, cultural practices and herbicides”, consisting of two field experiments was carried out in summer seasons of 2017 and 2018. Both experiments were conducted in split-plot design and replicated thrice. Exp. I, conducted during 2017 and 2018 at Ludhiana, had combination of two tillage systems (zero tillage, ZT); conventional tillage, CT) & two rice varieties (PR 124, PR 126) in main-plots and four weed control treatments viz. weedy; herbicides (pendimethalin plus pyrazosulfuron as pre- followed by (fb) bispyribac sodium as post-emergence); IWM (pendimethalin plus pyrazosulfuron as pre- fb bispyribac sodium as post-emergence fb hand weeding at 40 days after sowing) and weed free in sub-plots. Dry-seeded rice (DSR) raised under CT had lower infestation of grass weeds, higher infestation of sedge and broadleaf weeds, and it gave significantly higher grain yield (38-51%) than rice raised under ZT. PR 126 had more weed smothering potential and gave significantly higher grain yield than PR 124 under both tillage systems. PR 126, raised under CT and weed free conditions, gave highest rice grain yield (5.67-6.87 t ha-1), however, the highest economic returns (55873 Rs ha-1) were recorded under combination of PR 126, CT and IWM. CT and IWM had significant depletion of soil seedbank of grass weeds than ZT and herbicides alone, respectively. Exp. II, conducted in 2017 at Ludhiana and in 2018 at Ludhiana and Moga, had combinations of two green manure (without green manure i.e. conventional, CON); with Crotalaria juncea green manure (GM) & three N levels (120, 150, 180 kg N ha-1) in main-plots and three weed control treatments viz. (weedy; herbicides and IWM) in sub-plots. Soil organic carbon status and level of weed infestation influenced DSR response to green manure, N and weed control. Under low soil organic carbon (0.36%) and high level of weed infestation (at Ludhiana), rice grain yield losses due to weed competition were 60-70%. Green manure and N favored weeds more than crop. Rice responded up to 120 kg N in GM and up to 150 kg N ha-1 in CON. Integration of pre- and post-emergence herbicides with one hand weeding provided significantly higher level of weed control and grain yield than use of herbicides alone. Combination of CON, 180 kg N ha-1 and IWM gave the highest net returns (39426 Rs ha-1), however, combination treatment of CON, 180 kg N ha-1 and herbicides gave the highest B:C (2.33:1). After two years, soil seedbank of grass weeds was enhanced by GM than CON, 180 kg N than 120 kg N ha-1 and weedy check than herbicides. GM improved soil organic carbon. Under high soil organic carbon (0.67%) and low level of weed infestation (at Moga), weeds reduced rice yield up to 14% only. Rice responded up to 120 kg N in GM and up to 150 kg N ha-1 in CON. Pre- and post-emergence herbicides alone and their integration with one hand weeding provided similar level of weed control and rice grain yield. After one year, green manure and N had no effect on soil seedbank of Echinochloa colona, while herbicides use reduced seedbank than weedy check; GM had no effect on soil organic carbon.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810101485
dc.keywordsDry-seeded rice, green manure, integrated weed management, nitrogen, weed seedbank, variety, zero tillageen_US
dc.keywordsDry-seeded rice, green manure, integrated weed management, nitrogen, weed seedbank, variety, zero tillageen_US
dc.keywordsDry-seeded rice, green manure, integrated weed management, nitrogen, weed seedbank, variety, zero tillageen_US
dc.language.isoenen_US
dc.language.isoenen_US
dc.language.isoenen_US
dc.pages148en_US
dc.pages148en_US
dc.pages148en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemWeed management in dry-seeded rice through integration of tillage, cultural practices and herbicidesen_US
dc.research.problemWeed management in dry-seeded rice through integration of tillage, cultural practices and herbicidesen_US
dc.research.problemWeed management in dry-seeded rice through integration of tillage, cultural practices and herbicidesen_US
dc.subAgronomyen_US
dc.these.typePh.Den_US
dc.titleWeed management in dry-seeded rice through integration of tillage, cultural practices and herbicidesen_US
dc.titleWeed management in dry-seeded rice through integration of tillage, cultural practices and herbicidesen_US
dc.titleWeed management in dry-seeded rice through integration of tillage, cultural practices and herbicidesen_US
dc.typeThesisen_US
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