Manejo da adubação e seus efeitos na ocorrência de algas e na produtividade de arroz irrigado em áreas com residual de imidazolinonas

Sartori, Gerson Meneghetti Sarzi; Marchesan, Enio; Luz, Daniéli Saúl da; Cassol, Ana Paula Vestena; Figueiredo, Maria Carolina dos Santos; Oliveira, Maria Angélica; Silveira, Marcos Venicios Evaldt da; Ferreira, Rafael Bruck

doi:10.1590/s0103-84782011000800005

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…However, there is no field comparative information about algal communities in organic and conventional rice farming with herbicide application. Furthermore, the effects of herbicides on epiphytic and planktonic algae in paddy rice fields have been described mainly in mesocosms (Sartori et al 2011;Cassol et al 2013;Reck et al 2018;Liu et al 2020). This knowledge gap motivated us to investigate the phytoplankton and epiphyton in the two rice cultivation systems.…”

Section: Introductionmentioning

confidence: 99%

Do phytoplankton and epiphyton communities differ between organic and conventional rice fields?

2022

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This study aimed to determine if there are any differences in the attributes and composition of the phytoplankton and epiphyton communities between organic (OF) and conventional (CF) rice fields. We also strove to identify if there were any variations in these communities by comparing samples taken from two different periods (12 and 35 days) after the application of the herbicide clomazone and penoxsulam in CF. The farms are located in the Pampa Biome, Southern Brazil. Phytoplankton samples from the subsurface water and epiphyton samples from the rice stems were analyzed using the Utermöhl method. The CF and OF had distinct environmental conditions (pH, conductivity, and turbidity values), and the residual concentration of the herbicides decreased over time. There were no significant differences in epiphyton and phytoplankton density, or in phytoplankton richness, between the rice fields; only the epiphyton richness and taxonomic composition showed differences between the rice fields. Cyanobacteria and Chlorophyceae comprised a large proportion of the epiphytic density in CF and OF, respectively. However, Bacillariophyceae and Chlorophyceae had greater phytoplankton densities in CF and OF, respectively. The taxonomic composition of communities should be considered an effective tool to show the differences between the two cultivation systems.

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Section: Introductionmentioning

confidence: 99%

Do phytoplankton and epiphyton communities differ between organic and conventional rice fields?

2022

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“…A cultura do arroz se destaca como uma das mais importantes no mundo, sendo considerada como um produto de importância econômica e social, em função de sua ampla adaptabilidade, resposta à aplicação de tecnologias e diversas formas de cultivo (Sartori et al, 2011). A produção média brasileira na safra 2016/17, 2017/18 e 2018/19 foi de 10,953; 12,064 e 10,653 milhões de t, respectivamente.…”

Section: Introductionunclassified

Resposta do arroz irrigado ao fornecimento de fósforo e densidade de semeadura em sistema pré-germinado

Gutz

Cunha

Olescowicz

et al. 2019

Agraria

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RESUMO: O arroz irrigado apresenta elevada importância socioeconômica para o estado de Santa Catarina, contudo, estudos que visam a definição da densidade de semeadura e a resposta do arroz irrigado ao fornecimento de fósforo ainda são escassos. Desta maneira, este trabalho teve como objetivo avaliar a produtividade do arroz irrigado, conduzido em sistema pré-germinado, em função da densidade de semeadura e da adubação fosfatada. O experimento foi conduzido em blocos casualizados e os tratamentos foram arranjados em esquema fatorial 4 x 3, com quatro repetições. Foram testadas quatro densidades de semeadura da cultivar SCS 121 CL (60, 90, 120 e 150 kg ha -1 ) e três dosagens de fósforo (0, 25 e 50 kg ha -1 de P 2 O 5 ). As variáveis avaliadas foram: número de colmos por metro quadrado, número de panículas por metro quadrado, número de panículas por planta, produtividade de grãos e o peso de mil grãos. Os resultados indicam que a supressão da adubação fosfatada pode comprometer componentes de produção importantes, como o número de panículas por m 2 e o peso de mil grãos. Contudo, os fatores densidade de semeadura e dosagem de fósforo não influenciaram a produtividade de grãos. Palavras-chave: Alto Vale do Itajaí; componentes de rendimento; Oryza sativaPaddy rice response to phosphorus supply and sowing density in pre-germinated system ABSTRACT: Paddy rice present elevated importance socioeconomic in Santa Catarina State, however, research about the sowing density and paddy rice response to phosphorus supply are scarce. Thus, this work was the objective to evaluate the paddy rice yield, cultivated in pre-germinated system, in function of sowing density and phosphate fertilization. Experiment was conduct in blocks completely randomized and the treatments are arrange in factorial scheme 4 x 3, with four replications. Was test four sowing density of SCS 121 CL cultivar (60, 90, 120 and 150 kg ha -1 ) and three phosphorus rates (50, 25 e 0 kg ha -1 of P 2 O 5 ). The variable evaluated were number of stems per meter square, number of panicle per plant, yield and thousand-grain weight. The results indicated that phosphate fertilization reduce can compromise the important yield compounds, like number of panicle per meter square and thousand-grain weight. Yet, the factors sowing density and phosphorus rate not influence the yield.Resposta do arroz irrigado ao fornecimento de fósforo e densidade de semeadura em sistema pré-germinado Rev. Bras.

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“…Rice soils in Rio Grande do Sul are predominantly acidic (Boeni et al, 2010), which favors the adsorption and retention of the imidazolinones (Kraemer et al, 2009) reducing herbicide dissipation and enhancing its persistence carryover to the next growing season. Herbicide persistence in turn may result in growth retardation and development of non-tolerant crops that follow Clearfield® rice (Sartori et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Elevated CO2 Concentrations and Water Stress Affect the Ability of Italian Ryegrass to Remediate Herbicides and Enhance its Allelopathic Effect

et al. 2019

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The long temporal persistence of select herbicides negatively impacts crops sown in succession to irrigated rice. One way to reduce these compounds in the soil over time is through phytoremediation. However, elevated CO2 concentrations may interfere with the phytoremediation process. Another consequence of climate change is the production of allelopathic compounds by forage species used as remedial agents. This study aimed to evaluate the impact of elevated CO2 concentration and drought stress on the remediation of soil samples contaminated with imazapyr + imazapic herbicides by Italian ryegrass and any subsequential affect on the allelopathic effect of this species. We report that the increasing CO2 decreased the phytoremediation potential of ryegrass. Water stress combined with a CO2 concentration of 700 µmol mol-1 caused increased allelopathy. Overall, these are the first data to indicate a significant effect of higher CO2 levels with respect to both phytoremediation efficacy and allelopathic potential of the plant species used in phytoremediation.

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Manejo da adubação e seus efeitos na ocorrência de algas e na produtividade de arroz irrigado em áreas com residual de imidazolinonas

Abstract: 'IRGA 422 CL' and 'IRGA 417'.

Cited by 4 publications

References 14 publications

Do phytoplankton and epiphyton communities differ between organic and conventional rice fields?

Do phytoplankton and epiphyton communities differ between organic and conventional rice fields?

Resposta do arroz irrigado ao fornecimento de fósforo e densidade de semeadura em sistema pré-germinado

Elevated CO2 Concentrations and Water Stress Affect the Ability of Italian Ryegrass to Remediate Herbicides and Enhance its Allelopathic Effect

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