Caracterização morfológica de ecótipos de arroz daninho (Oryza sativa) provenientes de áreas de arroz irrigado

Schwanke, A.M.L.; Noldin, José Alberto; Andrés, A.; Procópio, S.O.; Concenço, Germani

doi:10.1590/s0100-83582008000200001

Cited by 10 publications

(4 citation statements)

References 6 publications

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“…Em relação ao degrane da panícula, as diferenças significativas foram encontradas entre os genótipos de arroz branco SCSBRS Tio Taka e EPAGRI109 sendo que todas apresentaram degrane intermediário (Tabela 3). Schwanke et al (2008) observaram que 69% dos genótipos de arroz vermelho estudados eram de fácil degrane concluindo que a maioria dos genótipos de arroz vermelho ainda possui o degrane como forma de dispersão das sementes e perpetuação da espécie. Populações de arroz vermelho com maior resistência ao degrane terão menor adaptabilidade ecológica e a tendência é de não se estabelecerem como planta daninha, haja vista que elas serão colhidas junto com o arroz comercial enquanto um baixo percentual de sementes é incorporado ao banco de sementes, no solo (Noldin et al, 2004).…”

Section: Resultsunclassified

Características morfoagronômicas de dois genótipos arroz vermelho em cultivo inundado

Menezes

Moreira

Pereira

et al. 2012

Agraria

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RESUMOApesar de ser praticamente desconhecido da maioria da população brasileira, o arroz vermelho vem sendo cultivado principalmente por pequenos agricultores da Região Nordeste do Brasil. O aumento da procura e o preço pago por esse tipo especial de arroz levam à necessidade de maiores informações sobre esta cultura; assim o objetivo do presente estudo foi a comparação de características morfoagronômicas dos genótipos Vermelho Virgínia e Vermelho Pequeno com os genótipos de arroz branco SCSBRS Tio Taka e EPAGRI109, nas condições edafoclimáticas de Seropédica, RJ. Para isto foi instalado um experimento no campo experimental do Departamento de Fitotecnia da UFRRJ, Seropédica, RJ, em outubro de 2009. O delineamento experimental foi o de blocos ao acaso, com quatro tratamentos e cinco repetições. As médias foram comparadas pelo teste de Student-Newman-Keuls a 5%. Os genótipos Vermelho Virgínia e Vermelho Pequeno apresentaram menor comprimento de grão porém o Vermelho Virgínia apresentou maior espessura, o que permitiu a classificação da forma dos grão desse genótipo como meioalongada. O genótipo Vermelho Virgínia apresentou maior porte em relação aos genótipos de arroz branco. Os genótipos Vermelho Virgínia e o Vermelho Pequeno, apresentaram menor produtividade, comparados aos dois genótipos recomendados para o cultivo no sistema inundado. Palavras-chave: componentes da produção, Oryza sativa L., produtividade Morpho-agronomic characteristics of traits of two red rice grown in flooded systems ABSTRACTDespite being virtually unknown to most Brazilians, the red rice has been grown mainly by small farmers in Northeastern Brazil. Increasing demand and the price paid for this special kind of rice leads to a need for more information about this crop. With this, the aim of this study was the comparison of morpho-agronomic characteristics of traits of red rice genotypes Vermelho Virgínia and Vermelho Pequeno with two white rice genotypes SCSBRS Tio Taka and EPAGRI109 under edaphoclimatic conditions of Seropédica, RJ. For this an experiment was installed at UFRRJ experimental field, Seropédica, RJ, Brazil, in October 2009. The experiment was in a completely randomized block design, with four treatments and five blocks. The means were compared by Student-Newman-Keuls test (5%). The genotypes Vermelho Virginia and Vermelho Pequeno had lower length of grain, but the Vermelho Virginia had thickest grain which permitted classification of its grain as a half-stretched. The genotype Vermelho Virginia had a larger height compared to genotypes of commercial white rice. The genotypes Vermelho Virginia and Vermelho Pequeno had lower yeild compared to two genotypes recommended for cultivation in flooded system.

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Section: Resultsunclassified

Características morfoagronômicas de dois genótipos arroz vermelho em cultivo inundado

Menezes

Moreira

Pereira

et al. 2012

Agraria

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“…Weedy rice is often, but not exclusively, associated with a red pericarp and is frequently referred to as "red" rice (Ziska et al 2015). Opposite to cultivated rice, weedy rice shatters its seed (Merotto et al 2016) that is highly dormant (Schwanke et al 2008) thus building up a large and persistent seedbank (Chauhan and Johnson 2010;Akasaka et al 2011;Zhang et al 2012a), and has high competitive ability given its higher tillering and enhanced photosynthesis (Fleck et al 2008;Dai et al 2016). Cultivated rice and weedy rice both belong to the same species and share similar morphological and physiological characteristics (Gross et al 2010); therefore, selective herbicides commonly used for weed control in paddy fields cannot be used to kill weedy rice making agronomic practices a key component for its management.…”

Section: Introductionmentioning

confidence: 99%

The within-field and between-field dispersal of weedy rice by combine harvesters

Gao

Zhang

Sun³

et al. 2018

Agron. Sustain. Dev.

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Weedy rice (Oryza sativa L.) severely decreases the grain yield and profitability of rice is one of the most significant problems in the majority of rice fields worldwide. Few reports focus on the dispersal of weedy rice, especially how it rapidly spreads to large areas and long distances. Here, we quantify for the first time the within-and between-field dispersal of weedy rice associated with combine harvesting operations. We randomly sampled 31 combine harvesters to determine where and how much weedy rice seeds remained on the machines at three locations in Jiangsu Province, China. Based on the sampling results, the field area over which weedy rice seeds were retained on the combine harvester during harvesting was estimated to assess the within-field dispersibility of weedy rice seeds remaining in the harvesters. A tracking experiment was also carried out by tracing the distribution of weedy rice seeds along harvest trails, to estimate the dispersal of weedy rice seeds within the field being harvested. Weedy rice seeds remained in the harvest pocket, on the pedrail, and the metal plate of the combine harvester. On average, more than 5000 weedy rice seeds which were 22.80% of remaining grains could potentially be transported into adjacent fields by the combine after each rice field infested with weedy rice had been harvested. Of the statistical models compared, a double exponential model simulating the variation in seed retention predicted that weedy rice seeds remaining on the metal plate could be dispersed over 6473.91 m 2 or 3236.96 m into the next field during the harvesting operation. Within the field, the number of fallen weedy rice seeds and their dispersal distance were positively correlated to weedy rice panicle density with the combine dispersing most of seeds away from their mother plant thus creating new weed patches. Therefore, fields that were severely infested with weedy rice should be harvested cautiously and separately and seed remaining in a harvester should be avoided to prevent intra-and inter-field, and even cross-regional dispersal of weedy rice.

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“…Nos últimos anos a produtividade da cultura tem evoluído, em função de novas tecnologias que são empregadas pelos rizicultores, como a tecnologia Clearfield® (Noldin et al, 2004;Schwanke et al, 2008). Contudo, ainda não foi atingido o patamar ideal de produtividade de 10 toneladas por hectare (Menezes et al, 2008), em razão de diversos fatores, como manejo de água, manejo de fertilidade, qualidade de sementes, sistematização de várzeas e controle fitossanitário (Agostinetto, 2001).…”

Section: Introductionunclassified

Suscetibilidade de biótipos de arroz-vermelho e de cultivares de arroz irrigado ao herbicida imazethapyr

et al. 2010

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, CANTO-DOROW, T.S. Palavras-chave: Clearfield, controle, Oryza sativa, planta daninhas, resistência.ABSTRACT -To evaluate the susceptibility of biotypes of red rice (Oryza sativa) and commercial rice cultivars to the herbicide imazethapyr, a greenhouse assay was conducted with five red rice biotypes (accesses Santa Maria 5, Pelotas 3, Rio Pardo 1, 2 and Manoel Viana Catuçaba 1), two commercial rice cultivars: Clearfield ® (Irga CL 422 and CL Puit INTA), and a conventional cultivar (Irga 417). The methodology of dose-response curves proposed by Seefeldt et al. (1995) was applied. The methodology of response curves was generated from the parameters of the logistic model and the values of I 50 . The red rice biotypes and cultivars were subjected to six doses of the herbicide imazethapyr (0, 33.12, 66.25, 132.5, 265.0 and 530.0 g a.i. ha -1 ). Rice plants were counted and collected on the 20th day after treatment application. Damage percentage analysis was performed by visual assessment of phytotoxicity (%), plant green mass, and plant dry mass. Through the curves and results of the analysis of variance, it could be inferred that the cultivars Irga Clearfield CL 422 and CL Puit INTA were significantly equal to red rice biotype Catuçaba 1, resisting to imazethapyr doses higher than those recommended to the Match Clearfield ® system in the field. Biotypes Manoel Viana 2, Santa Maria 5, and Pelotas 3 grouped with the conventional cultivar IRGA 417, and were susceptible to the commercial dose of the herbicide. Rio Pardo 1 biotype is also resistant to the herbicide imazethapyr, but less than biotype Catuçaba 1.

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Caracterização morfológica de ecótipos de arroz daninho (Oryza sativa) provenientes de áreas de arroz irrigado

Cited by 10 publications

References 6 publications

Características morfoagronômicas de dois genótipos arroz vermelho em cultivo inundado

Características morfoagronômicas de dois genótipos arroz vermelho em cultivo inundado

The within-field and between-field dispersal of weedy rice by combine harvesters

Suscetibilidade de biótipos de arroz-vermelho e de cultivares de arroz irrigado ao herbicida imazethapyr

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