Época de aplicação de nitrogênio e de início da irrigação na fitotoxicidade causada pela aplicação de imidazolinonas em arroz tolerante

Avila, Luis Antônio de; Cezimbra, Diogo Machado; Marchesan, Enio; Machado, Sérgio Luiz de Oliveira; Pasini, Martin; Glier, Cláudio Alexandre da Silva; Ferreira, Rafael Bruck

doi:10.1590/s0103-84782009005000118

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…We suggest that continued management with cover fertilizers can help the plants to recover. Camargo et al (2011) observed recovery of rice plants with high levels of injury by the application of post-emergence herbicides, suggesting that the management of the crop and the addition of nutrients by nitrogenous fertilizers (Golden et al, 2017), as well as the entry of water (Avila et al, 2009), contribute to plant recovery. The estimated drift rates using the phytotoxicity level of the sentinel plants were 14, 13, and 5% of the package insert dose (1,920 g e.a.…”

Section: Resultsmentioning

confidence: 99%

Drift Distance in Aircraft Glyphosate Application Using Rice Plants as Indicators

et al. 2020

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ABSTRACT: This study aimed to evaluate the potential for glyphosate drift during aerial application using rice plants as sentinels, aiming to determine the effect of drift on irrigated rice crops. For this purpose, a field experiment was performed using an entirely randomized design with four replicates, evaluating different distances from the site of application [control (no application), 0, 12.5, 25, 50, 75, 100, 150, 200, 300, and 400 m]. The experiment was carried out at the Granjas 4 Irmãos farm, located in the Rio Grande city, Rio Grande do Sul State, Brazil. The glyphosate dose application was 1,920 g e.a. ha-1 (Roundup Transorb®, 480 g e.a. L-1 glyphosate isopropylamine salt). A dose-response curve was developed to estimate the drift rate in sentinel plants, by applying increasing glyphosate doses in rice plants and assessing the injury level. The drift rates estimated by the injury level in sentinel plants were 14% (150 m), 13% (200 m), and 5% (400 m). Death of the experimental units was observed for distances between 0 and 50 m, while in distances between 75 and 150 m, 25 to 50% of the plants survived, reducing productivity. In the distances between 200 and 400 m, there was no reduction in productivity when compared to the control, even when the injury levels reached 52 to 82%. Thus, we concluded that a 5% glyphosate drift reached up to 400 m from the application range. Considering the recommendation of zero drift, distances greater than 400 m should be adopted to avoid symptoms in rice plants. We suggest using distances of more than 400 m in future studies.

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Section: Resultsmentioning

confidence: 99%

Drift Distance in Aircraft Glyphosate Application Using Rice Plants as Indicators

et al. 2020

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“…A inobservância de significância em resposta às doses de nitrogênio indica para o fato de que a planta de arroz não responde de forma diferente ao nutriente quando exposta à deriva de glyphosate. Cabe destacar que, em situações de campo, produtores utilizam de alterações no manejo do nitrogênio em áreas comerciais para promover a recuperação das plantas após exposição à deriva, situação que pode ser favorável para a recuperação da fitotoxicidade a herbicidas como observado para aqueles pertencentes ao grupo das imidazolinonas (AVILA et al,2009). Tabela 1.…”

Section: Resultsunclassified

A deriva de glyphosate interfere no desenvolvimento e produtividade de arroz irrigado

et al. 2019

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Objetivo do trabalho foi avaliar os danos ao desenvolvimento e produtividade de cultivar de arroz irrigado de ciclo precoce (IRGA 430), ocasionados por deriva simulada de glyphosate. O experimento foi realizado a campo na Estação Experimental do Arroz – IRGA na safra 2016/17 e os tratamentos foram arranjados em esquema fatorial 3x2+1 cujo fator A constou da simulação de deriva de glyphosate nas doses de 135; 270 e 540g ha-1 e.a.; o fator B de duas doses de nitrogênio (N), sendo eles 90 e 121,5 kg ha-1 de N; mais testemunha sem aplicação de glyphosate e com aplicação de 90kg ha-1 de N. O aumento na dose de glyphosate resultou em maiores danos à cultura, como sintomas de fitotoxicidade, redução no número de panículas por área e no rendimento de grãos que foi de aproximadamente 60% na maior dose estudada. De acordo com o aumento da dose de glyphosate também ocorreu o prolongamento no número de dias entre a emergência da cultura até o estágio de desenvolvimento de antese (R4). A deriva simulada de glyphosate evidencia que o herbicida causa elevada fitotoxicidade a cultura, menor estatura as plantas e aumento do ciclo de desenvolvimento, interferindo negativamente na produtividade da cultura do arroz irrigado.

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“…Imidazolinone-tolerant rice varieties can have the ability to detoxify herbicide molecules of that chemical group and recover from injuries caused by their application, as long as the plants are in optimal conditions for their growth and development (Webster & Masson, 2001). Therefore, the adequate crop management as top-dressing nitrogen fertilization in up to five days after herbicide application in post-emergence, as well as the establishment of irrigation in sequence contributes to the mitigation of the herbicide effects (Avila et al, 2009). In study of Sousa et al (2014), it was observed that the photosynthetic apparatus of the rice variety Puitá INTA CL was injured by the application of the commercial rates of the herbicides imazapyr+imazapic and imazethapyr+imazapic.…”

Section: Resultsmentioning

confidence: 99%

Phytotoxicity of imazapyr+imazapic on tolerant rice varieties Guri INTA CL and IRGA 424 RI

et al. 2019

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Rice varieties from the Clearfield ® system may present different tolerance levels to imidazolinone herbicides in function of application rate. The objective of this research was to evaluate the phytotoxicity of different rates of the formulated mixture of the herbicides imazapyr+imazapic applied on two tolerant irrigated rice varieties. The experiment was carried out in 2015/16 and 2016/17 growing seasons. A randomized complete block design was used in a factorial 2x6 with five replications. The factor A was composed by the tolerant rice varieties Guri INTA CL and IRGA 424 RI, and the factor B by rates of the formulated mixture of the herbicides imazapyr+imazapic (525+175 g a.i. kg -1 ) of 0, 140, 210, 280, 350, and 420 g c.p. ha -1 . In the first growing season, it was observed maximum phytotoxicity of 8.5% while in the second the highest percentage was 13%. The number of stems m -2 , plant height, shoot dry matter, SPAD index, and grain yield were not influenced (p < 0.05) by herbicide rates. The application of the formulated mixture of the herbicides imazapyr+imazapic causes low initial phytotoxicity to the tolerant rice varieties Guri INTA CL and IRGA 424 RI up to three times the recommended rate, not influencing their grain yield.

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Época de aplicação de nitrogênio e de início da irrigação na fitotoxicidade causada pela aplicação de imidazolinonas em arroz tolerante

Cited by 4 publications

References 18 publications

Drift Distance in Aircraft Glyphosate Application Using Rice Plants as Indicators

Drift Distance in Aircraft Glyphosate Application Using Rice Plants as Indicators

A deriva de glyphosate interfere no desenvolvimento e produtividade de arroz irrigado

Phytotoxicity of imazapyr+imazapic on tolerant rice varieties Guri INTA CL and IRGA 424 RI

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