Off-season management with herbicides as an alternative to reduce weed infestation in paddy rice production systems
Abstract Background: Weed management is a challenge in paddy rice production, mainly due to the dispersal of a population resistant to herbicides. Objective: To assess the efficacy of chemical weed control in the off-season to reduce weedy rice and other species in water-seeded or drilled rice....
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira da Ciência das Plantas Daninhas
2020-12-01
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| Series: | Planta Daninha |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100339&tlng=en |
| _version_ | 1818947135125585920 |
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| author | Antonio M. Oliveira Neto Naiara Guerra José A. Noldin |
| author_facet | Antonio M. Oliveira Neto Naiara Guerra José A. Noldin |
| author_sort | Antonio M. Oliveira Neto |
| collection | DOAJ |
| description | Abstract Background: Weed management is a challenge in paddy rice production, mainly due to the dispersal of a population resistant to herbicides. Objective: To assess the efficacy of chemical weed control in the off-season to reduce weedy rice and other species in water-seeded or drilled rice. Methods: Two experiments were carried out in a flat field to water-seeded or drilled rice, in randomized block design. The water-seeded system treatments were organized in a split-plot design. In the plot were evaluated two water management in the off-season (with or without continuous flooding), and in the subplot nine herbicides-treatments were evaluated (Check, clomazone at 0.72 and 1.08 kg a.i. ha-1, oxadiazon at 1.00 and 1.50 kg a.i. ha-1, oxyfluorfen at 0.312 and 0.48 kg a.i. ha-1, S-metolachlor at 1.44 kg a.i. ha-1, and flumioxazin a 0.075 kg a.i. ha-1). In the drilled rice experiment, the treatments were organized in a two-factor factorial. The factor A was nine herbicides treatments (the same herbicide and rates applied in water-seeded experiment) and the factor B was two application time (73 and 43 days before of rice-sowing). Results: Off-season management was efficient to reduce weedy rice infestation only on the paddy rice system using the pre-germinated seeds. In this assay, flumioxazin was an efficient alternative to giant arrowhead control, however the selectivity of this herbicide treatment needs to be studied. In dry-seeded system, herbicide sprayed in off-season reduced barnyardgrass infestation until the paddy rice sowing. Conclusions: The off-season management was efficient to reduce weedy rice and giant arrowhead infestation in water-seeded system, and barnyardgrass infestation in drill-seeded system. |
| first_indexed | 2024-12-20T08:26:05Z |
| format | Article |
| id | doaj.art-89a4ca4fc2c94ba9ab7c748246f4b59d |
| institution | Directory Open Access Journal |
| issn | 0100-8358 |
| language | English |
| last_indexed | 2024-12-20T08:26:05Z |
| publishDate | 2020-12-01 |
| publisher | Sociedade Brasileira da Ciência das Plantas Daninhas |
| record_format | Article |
| series | Planta Daninha |
| spelling | doaj.art-89a4ca4fc2c94ba9ab7c748246f4b59d2022-12-21T19:46:50ZengSociedade Brasileira da Ciência das Plantas DaninhasPlanta Daninha0100-83582020-12-013810.1590/s0100-83582020380100082Off-season management with herbicides as an alternative to reduce weed infestation in paddy rice production systemsAntonio M. Oliveira Netohttps://orcid.org/0000-0002-4616-5594Naiara Guerrahttps://orcid.org/0000-0002-4215-3027José A. Noldinhttps://orcid.org/0000-0003-1848-2776Abstract Background: Weed management is a challenge in paddy rice production, mainly due to the dispersal of a population resistant to herbicides. Objective: To assess the efficacy of chemical weed control in the off-season to reduce weedy rice and other species in water-seeded or drilled rice. Methods: Two experiments were carried out in a flat field to water-seeded or drilled rice, in randomized block design. The water-seeded system treatments were organized in a split-plot design. In the plot were evaluated two water management in the off-season (with or without continuous flooding), and in the subplot nine herbicides-treatments were evaluated (Check, clomazone at 0.72 and 1.08 kg a.i. ha-1, oxadiazon at 1.00 and 1.50 kg a.i. ha-1, oxyfluorfen at 0.312 and 0.48 kg a.i. ha-1, S-metolachlor at 1.44 kg a.i. ha-1, and flumioxazin a 0.075 kg a.i. ha-1). In the drilled rice experiment, the treatments were organized in a two-factor factorial. The factor A was nine herbicides treatments (the same herbicide and rates applied in water-seeded experiment) and the factor B was two application time (73 and 43 days before of rice-sowing). Results: Off-season management was efficient to reduce weedy rice infestation only on the paddy rice system using the pre-germinated seeds. In this assay, flumioxazin was an efficient alternative to giant arrowhead control, however the selectivity of this herbicide treatment needs to be studied. In dry-seeded system, herbicide sprayed in off-season reduced barnyardgrass infestation until the paddy rice sowing. Conclusions: The off-season management was efficient to reduce weedy rice and giant arrowhead infestation in water-seeded system, and barnyardgrass infestation in drill-seeded system.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100339&tlng=endrill-seededwater-seededresidual herbicidespre-germinatedOryza sativa |
| spellingShingle | Antonio M. Oliveira Neto Naiara Guerra José A. Noldin Off-season management with herbicides as an alternative to reduce weed infestation in paddy rice production systems Planta Daninha drill-seeded water-seeded residual herbicides pre-germinated Oryza sativa |
| title | Off-season management with herbicides as an alternative to reduce weed infestation in paddy rice production systems |
| title_full | Off-season management with herbicides as an alternative to reduce weed infestation in paddy rice production systems |
| title_fullStr | Off-season management with herbicides as an alternative to reduce weed infestation in paddy rice production systems |
| title_full_unstemmed | Off-season management with herbicides as an alternative to reduce weed infestation in paddy rice production systems |
| title_short | Off-season management with herbicides as an alternative to reduce weed infestation in paddy rice production systems |
| title_sort | off season management with herbicides as an alternative to reduce weed infestation in paddy rice production systems |
| topic | drill-seeded water-seeded residual herbicides pre-germinated Oryza sativa |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100339&tlng=en |
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