Pre-emergent herbicides during the off-season of irrigated rice to control weedy rice and reduce the soil seed bank
ABSTRACT: Weedy rice (Oryza sativa L.) is the most important weed in irrigated rice cultivation, being one of the main factors limiting cereal productivity in Rio Grande do Sul (RS). Thus, this study determined the effect of pre-emergent herbicide use in autumnal management on the control and reduct...
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Universidade Federal de Santa Maria
2025-01-01
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| Series: | Ciência Rural |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782025000400152&lng=en&tlng=en |
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| author | Tilio Adan Lucas Simone Puntel Rafaella Boemo Mario Leonardo da Silva Bolson Arícia Ritter Corrêa Pedro Henrique Folharini Murilo Vieira Loro André da Rosa Ulguim |
| author_facet | Tilio Adan Lucas Simone Puntel Rafaella Boemo Mario Leonardo da Silva Bolson Arícia Ritter Corrêa Pedro Henrique Folharini Murilo Vieira Loro André da Rosa Ulguim |
| author_sort | Tilio Adan Lucas |
| collection | DOAJ |
| description | ABSTRACT: Weedy rice (Oryza sativa L.) is the most important weed in irrigated rice cultivation, being one of the main factors limiting cereal productivity in Rio Grande do Sul (RS). Thus, this study determined the effect of pre-emergent herbicide use in autumnal management on the control and reduction of the weedy rice seed bank. Field experiments were conducted in a randomized complete block design with four replications in a commercial rice production area in the 2021/22 and 2022/23 growing seasons in Dom Pedrito (RS). The scheme used was factorial, with factor A consisting of different herbicide application times, namely June, July, and August, and corresponding to 100, 78, and 26 days and 42, 26, and 10 days before rice sowing for the agricultural years 2021/22 and 2022/23, respectively. Factor B consisted of the application of the herbicides s-metolachlor (1440 g a.i. ha-1), sulfentrazone + diuron (210 and 420 g a.i. ha-1), piroxasulfone (170 g a.i. ha-1), and flumioxazin (50 g a.i. ha-1), in addition to the control (no application). The evaluated variables were control (%), number of plants (m-2) at crop pre-harvest, number of full, viable, and non-viable wild rice seeds m-2 in the soil, crop injury (%), and grain yield (kg ha-1). The herbicides showed control values below 25% and low reduction of the seed bank in the soil, being considered ineffective in this application modality. The herbicides s-metolachlor, sulfentrazone + diuron, and flumioxazin exhibited the highest injury values; however, they did not significantly affect crop productivity. Thus, when applied before rice sowing, the herbicides s-metolachlor, sulfentrazone + diuron, pyroxasulfone, and flumioxazin did not provided satisfactory control and do not significantly reduce the wild rice seed bank. |
| format | Article |
| id | doaj-art-c9ea2a3cdca14b6295c853ec05444995 |
| institution | Kabale University |
| issn | 1678-4596 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Universidade Federal de Santa Maria |
| record_format | Article |
| series | Ciência Rural |
| spelling | doaj-art-c9ea2a3cdca14b6295c853ec054449952025-01-21T07:44:45ZengUniversidade Federal de Santa MariaCiência Rural1678-45962025-01-0155410.1590/0103-8478cr20240207Pre-emergent herbicides during the off-season of irrigated rice to control weedy rice and reduce the soil seed bankTilio Adan Lucashttps://orcid.org/0009-0008-0878-4571Simone Puntelhttps://orcid.org/0000-0003-0404-3334Rafaella Boemo Mariohttps://orcid.org/0000-0003-2783-637XLeonardo da Silva Bolsonhttps://orcid.org/0009-0006-1519-4575Arícia Ritter Corrêahttps://orcid.org/0000-0002-7527-0668Pedro Henrique Folharinihttps://orcid.org/0009-0003-4722-7560Murilo Vieira Lorohttps://orcid.org/0000-0003-0241-4226André da Rosa Ulguimhttps://orcid.org/0000-0002-8850-4670ABSTRACT: Weedy rice (Oryza sativa L.) is the most important weed in irrigated rice cultivation, being one of the main factors limiting cereal productivity in Rio Grande do Sul (RS). Thus, this study determined the effect of pre-emergent herbicide use in autumnal management on the control and reduction of the weedy rice seed bank. Field experiments were conducted in a randomized complete block design with four replications in a commercial rice production area in the 2021/22 and 2022/23 growing seasons in Dom Pedrito (RS). The scheme used was factorial, with factor A consisting of different herbicide application times, namely June, July, and August, and corresponding to 100, 78, and 26 days and 42, 26, and 10 days before rice sowing for the agricultural years 2021/22 and 2022/23, respectively. Factor B consisted of the application of the herbicides s-metolachlor (1440 g a.i. ha-1), sulfentrazone + diuron (210 and 420 g a.i. ha-1), piroxasulfone (170 g a.i. ha-1), and flumioxazin (50 g a.i. ha-1), in addition to the control (no application). The evaluated variables were control (%), number of plants (m-2) at crop pre-harvest, number of full, viable, and non-viable wild rice seeds m-2 in the soil, crop injury (%), and grain yield (kg ha-1). The herbicides showed control values below 25% and low reduction of the seed bank in the soil, being considered ineffective in this application modality. The herbicides s-metolachlor, sulfentrazone + diuron, and flumioxazin exhibited the highest injury values; however, they did not significantly affect crop productivity. Thus, when applied before rice sowing, the herbicides s-metolachlor, sulfentrazone + diuron, pyroxasulfone, and flumioxazin did not provided satisfactory control and do not significantly reduce the wild rice seed bank.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782025000400152&lng=en&tlng=enOryza sativa (L.)integrated weed managements-metolachlorsulfentrazone + diuronpyroxasulfoneflumioxazin. |
| spellingShingle | Tilio Adan Lucas Simone Puntel Rafaella Boemo Mario Leonardo da Silva Bolson Arícia Ritter Corrêa Pedro Henrique Folharini Murilo Vieira Loro André da Rosa Ulguim Pre-emergent herbicides during the off-season of irrigated rice to control weedy rice and reduce the soil seed bank Ciência Rural Oryza sativa (L.) integrated weed management s-metolachlor sulfentrazone + diuron pyroxasulfone flumioxazin. |
| title | Pre-emergent herbicides during the off-season of irrigated rice to control weedy rice and reduce the soil seed bank |
| title_full | Pre-emergent herbicides during the off-season of irrigated rice to control weedy rice and reduce the soil seed bank |
| title_fullStr | Pre-emergent herbicides during the off-season of irrigated rice to control weedy rice and reduce the soil seed bank |
| title_full_unstemmed | Pre-emergent herbicides during the off-season of irrigated rice to control weedy rice and reduce the soil seed bank |
| title_short | Pre-emergent herbicides during the off-season of irrigated rice to control weedy rice and reduce the soil seed bank |
| title_sort | pre emergent herbicides during the off season of irrigated rice to control weedy rice and reduce the soil seed bank |
| topic | Oryza sativa (L.) integrated weed management s-metolachlor sulfentrazone + diuron pyroxasulfone flumioxazin. |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782025000400152&lng=en&tlng=en |
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