Desfolha artificial simulando danos de pragas no cultivo de arroz de sequeiro de casa de vegetação

Bertoncello, Thiago Ferreira; Lima, Izidro dos Santos de; Melo, Elmo Pontes de; Fonseca, Paulo Rogério Beltramin da; Degrande, Paulo Eduardo

doi:10.7213/cienciaanimal.v9i1.11066

Cited by 5 publications

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“…In this study, we observed that carfentrazone-ethyl caused defoliation in sweet potato plants, effects that were similar to those produced by flumioxazin, another PROTOX inhibitor (Stephen et al, 2014). According to Bertoncello et al, (2011), defoliation drastically reduces productivity by interfering with the distribution of photoassimilates within the plant, and recovery depends on the extent of defoliation and the degree of development of the crop at the time of exposure to the herbicide. Although PROTOX inhibitors have reduced crop selectivity when sprayed during leaf emergence (Oliveira Junior et al, 2011), they do not damage new leaves that.…”

Section: Agronomic Evaluations For Herbicide Selection Dry Weight (Dw)mentioning

confidence: 64%

Physiological and agronomic responses to the application of post-emergence herbicides on sweet potato cultivar selected for its potential as biofuel feedstock

Lima

Gonçalves

Campos³

et al. 2022

Aust J Crop Sci

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Sweet potato exhibits a prostrate growth habit, which makes weed management to be manually performed or conducted through the application of selective herbicides. Considering the absence of registered herbicides for the selective control of broad leaf weeds on the sweet potato crop, we investigated the physiological and agronomic responses of the sweet potato cultivar Duda, selected for its great potential in biofuel production, to different post-emergence herbicides. Two experiments, one conducted under field conditions and the other under controlled (potted plants) conditions, were performed under a randomized complete block design, with four replicates each. Four different herbicides, atrazine and S-metolachlor (3,5 L.ha-1), carfentrazone-ethyl (0,75 L.ha-1), fomesafen and fluazifop-P-butyl (1,8 L.ha-1) and nicosulfuron (1,25 L.ha-1), were used and the experiments were composed by five treatments with the control (no herbicide application) treatment,. Physiological indicators, including carbon assimilation, stomatal conductance, leaf transpiration rate, internal CO2 concentration, and water-use efficiency were monitored at 24 h, 48 h and 15 d after herbicides application, while agronomic evaluations were performed at 30 and 152 days from herbicide application. Application of atrazine (inhibitor of photosystem II) together with S-metolachlor (inhibitor of cell division/elongation) led to reductions on the physiological indices soon after treatment imposition but it had no effect on dry matter accumulation in the shoot, nor on the roots, not affecting the starch content, storage root productivity, and estimated ethanol production as well. In contrast, application of carfentrazone-ethyl, a protoporphyrinogen oxidase inhibitor, exerted significant negative physiological and agronomic effects, decreasing root productivity and estimated ethanol yield. We conclude that the use of atrazine in a mixture with S-metolachlor represents a suitable selective approach for the control of broad leaf weeds in sweet potato crops.

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Section: Agronomic Evaluations For Herbicide Selection Dry Weight (Dw)mentioning

confidence: 64%

Physiological and agronomic responses to the application of post-emergence herbicides on sweet potato cultivar selected for its potential as biofuel feedstock

Lima

Gonçalves

Campos³

et al. 2022

Aust J Crop Sci

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“…Evidenciando que a desfolha afeta diferentemente a produção em função do estádio de desenvolvimento da planta, independentemente do sistema de cultivo. A interação em estudo sobre desfolhas é fato comumente relatado por vários autores, trabalhando com diferentes culturas como milho, girassol, arroz e o algodoeiro (LAUER et al 2004;MURO et al 2001;LIMA JR. et al 2010;BERTONCELLO et al 2011;SILVA et al 2012).…”

Section: Resultsunclassified

Impacto da Desfolha Artificial no Desenvolvimento, Produtividade e Qualidade de Fibra do Algodoeiro (Gossypium hirsutum L.) Convencional e Adensado

et al. 2022

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A capacidade do algodoeiro de se recuperar após uma desfolha se faz em função do nível de redução da área foliar, estágio de desenvolvimento da planta em que ocorrer a injúria, condições climáticas e práticas do sistema de cultivo. O objetivo deste estudo foi avaliar os efeitos da desfolha no desenvolvimento, produtividade e qualidade de fibra do algodoeiro, nos sistemas de espaçamentos adensado e convencional. Para isso, conduziu-se experimentos em condições de campo, em Dourados (MS), utilizando-se a cultivar NuOpal RR®, em delineamento de blocos ao acaso (com parcelas subdivididas) e quatro repetições em dois sistemas de cultivo (adensado e convencional). Os tratamentos constituíram-se de cinco fases de desenvolvimento da cultura: V3, B1, F1, F5 e C1, (de acordo com a escala de Marur e Ruano (2001) e quatro níveis de desfolhamento artificial (0%, 33%, 66% e 99% da área foliar). O efeito da desfolha nos índices de produtividade e qualidade de fibras foi dependente do estádio do fenológico em que a cultura se encontrava independente do sistema de cultivo estudado. Já quando as plantas estavam nos estádios B1 e F1 e sofreram desfolha de 99%, este afetou os índices de qualidade de fibras, enquanto a redução de área foliar no estádio C1 não afetou os índices de qualidade e produtividade do algodoeiro. Palavras chave: Área Foliar. Dano. Sistemas de Cultivo. Algodão. Abstract The ability of the cotton plant to recover after defoliation is a function of the level of reduction of the leaf area, stage of development of the plant in which injury occurs, climatic conditions and practices of the cultivation system. The objective of this study was to evaluate the behavior of cotton submitted to different levels and times of defoliation in systems of conventional and narrow row cultivation. Experiments were conducted in field conditions, in Dourados (MS), using the cultivar NuOpal RR® in a randomized block design (with subdivided plots) and four replications in two cultivation systems (narrow row and conventional). The treatments consisted of five stages of crop development: V3, B1, F1, F5 and C1, (according to the scale of Marur & Ruano (2001) and four levels of artificial defoliation (0%, 33%, 66 % and 99% of the leaf area artificially eliminated.) The effect of defoliation on the indexes productivity and fiber quality depends on the phenological stage in which the culture was, independent of the cultivation system studied. When the plants were in stages B1 and F1 and suffered defoliation of 99%, this affected the fiber quality indexes, while the reduction of leaf area in the C1 stage did not affect the quality and productivity indexes of the cotton. Keywords: Leaf Area. Damage. Cultivation Systems. Cotton.

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“…Alvim et al (2011) teve resultados semelhantes, ao presente trabalho, onde ressalta que a área foliar é a parte mais eficiente e importante na produção de grãos devida a relação fonte-dreno, também relata que a desfolha da planta de milho afeta o diâmetro do colmo, massa de grãos e produtividade. Estudos com arroz, girassol e canola descrevem essa interação entre nível de desfolha e estádio de desenvolvimento, relacionando as maiores perdas quando a desfolha ocorre nos estádios reprodutivos (LIMA JUNIOR et al, 2010;BERTONCELLO et al, 2011;FONSECA et al, 2013).…”

Section: Resultsunclassified

“…Nos estudos conduzidos por Bertoncello et al (2011) observa-se que as maiores reduções na produção do arroz sequeiro ocorrem com 50% da desfolha nos estádios reprodutivos, isso acontece porque as plantas estão mais sensíveis à desfolha extrema nesses estádios.…”

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Artificial Defoliation Simulating Pest Damage in Growing Pearl Millet

Fonseca¹,

Fernandes²,

Kassab³

et al. 2014

Nucleus

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RESUMO:O objetivo desta pesquisa foi avaliar os componentes de produção de plantas do milheto submetidos a níveis crescentes de desfolha de 0; 25; 50; 75 e 100%, realizadas nos estádios fenológicos (ED1, ED4 e ED7). O experimento foi realizado em condições de campo, composto por 15 tratamentos, dispostos em blocos ao acaso, com quatro repetições. As variáveis avaliadas foram diâmetro do colmo, massa seca da parte aérea e produtividade de grãos de milheto. A maior redução do diâmetro do colmo ocorre com 100% de desfolha em ED4. Desfolhas acima de 25% afetam a produtividade de grãos, no estádio ED1, na cultura a campo. No estádio ED1, desfolha de 50%, reduz a massa seca da parte aérea e nas desfolhas de 75 e 100% não afeta à produtividade das plantas.Palavras-chaves: Área foliar. Nível de dano. Pennisetum glaucum. Produtividade. ARTIFICIAL DEFOLIATION SIMULATING PEST DAMAGE IN GROWING PEARL MILLET SUMMARY:The objective of this research was to evaluate yield components of pearl millet plants subjected to increasing levels of defoliation of 0, 25, 50, 75 and 100%, made growth stages (ED1, ED4 and ED7). The experiment was conducted under field conditions, consisted of 15 treatments arranged in a randomized block design with four replications. The variables analyzed were stem diameter, shoot dry mass and grain yield of millet. The greatest reduction of the diameter of the stem occurs in 100% defoliation ED4. Defoliation above 25% affect grain yield, the stadium ED1 in the culture field. In stage ED1, defoliation of 50%, reduces the dry mass of shoots and defoliation of 75% and 100 does not affect the yield.

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Desfolha artificial simulando danos de pragas no cultivo de arroz de sequeiro de casa de vegetação

Cited by 5 publications

References 0 publications

Physiological and agronomic responses to the application of post-emergence herbicides on sweet potato cultivar selected for its potential as biofuel feedstock

Physiological and agronomic responses to the application of post-emergence herbicides on sweet potato cultivar selected for its potential as biofuel feedstock

Impacto da Desfolha Artificial no Desenvolvimento, Produtividade e Qualidade de Fibra do Algodoeiro (Gossypium hirsutum L.) Convencional e Adensado

Artificial Defoliation Simulating Pest Damage in Growing Pearl Millet

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