Variação do tamanho de sementes de plantas daninhas e sua influência nos padrões de emergência das plântulas

Araldi, Rosilaine; Velini, Edivaldo Domingues; Gomes, Giovanna Larissa Gimenes Cotrick; Carbonari, Caio Antônio; Alves, Elza; Trindade, Maria Lúcia Bueno

doi:10.1590/s0100-83582013000100013

Cited by 9 publications

(9 citation statements)

References 16 publications

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“…decumbens emergence was affected by seeds location at the soil profile, therewith has occurred high intensity emergence reduction from 7.0 cm depth. Araldi et al (2013) and Ikeda et al (2013), also observed that sowing depth (B. decumbens) from 0.0 to 6.0 cm obtained the highest SEI.…”

Section: Resultsmentioning

confidence: 73%

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Emergency Brachiaria Decumbens a Function of Depth of Seeds in Soil Profile

Silva¹,

Pitelli²,

Cruz³

et al. 2014

Nucleus Animal.

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SUMMARY:The grass B. decumbens is the most cultivated pasture establishment in Brazil pastures and on areas used for other crops is amongst the more undesired weeds, due to hard control and rusticity. Therefore, the aim of this study was to determine the effects of sowing depths on B. decumbens emergence. The tests were performed on green house using the following sowing depths (0.0, 0.5, 1.0, 1.5, 2.0, 2. 5, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0 e 10.0 cm). From 7.0 cm deep occurred significant emergence speed index (SEI) and seedlings emergence percentage (%ESI) reduction. In assessing the ability of germination of B. decumbens occurred suppression effect of germination in greater depth evaluated, while the other depths were tested emergency plan, with lower occurrence between 5 and 7 cm and topsoil. Layers between 0.5 and 2.5 cm larger plants des emergency occurred.Keywords: Soil Seed Ban. Vigor. Weed. EMERGÊNCIA DE BRACHIARIA DECUMBENS EM FUNÇÃO DA PROFUNDIDADE DE SEMENTES NO PERFIL DO SOLORESUMO: A gramínea B. decumbens é a mais cultivada em formação de pastagens no Brasil, em áreas onde são utilizadas para outros cultivos torna-se uma das plantas daninhas mais indesejadas, devido o seu difícil controle e rusticidade. Assim, o objetivo deste estudo foi determinar a emergência das plântulas de B. decumbens em profundidades de semeadura. Os ensaios foram realizados em casa de vegetação com as seguintes profundidades de semeadura (0,0; 0,5; 1,0; 1,5; 2,0; 2,5; 3,0; 4,0; 5,0; 6,0; 7,0; 8,0; 9,0 e 10,0 cm). A partir de 7,0 cm de profundidade ocorreu redução significativa no índice de velocidade de emergência (IVE) e na porcentagem de emergência das plântulas (%ESI) de B. decumbens. Na avaliação da habilidade de germinação da B. decumbens ocorreu efeito de supressão da germinação na maior profundidade avaliada, enquanto que, as demais profundidades testadas ocorreram emergência da planta, com menor ocorrencia entre 5 e 7 cm e na camada superficial do solo. Nas camadas entre 0,5 e 2,5 cm ocorreu maior emergência des plantas.Palavras -chave: Banco de sementes em solo. Vigor. Planta daninha.

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Section: Resultsmentioning

confidence: 73%

“…Araldi et al (2013), evaluated accumulated emergence at sowing depths and observed resemblances between three seed classification sizes (small, medium and big).…”

Section: Resultsmentioning

confidence: 99%

Emergency Brachiaria Decumbens a Function of Depth of Seeds in Soil Profile

Silva¹,

Pitelli²,

Cruz³

et al. 2014

Nucleus Animal.

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“…Measures of position, mean, median and mode are different among them, and mean and median values are higher than mode values; therefore, this asymmetrical distribution is positive (Table 3). Thus, it is possible to identify that there is higher variability among higher ammonium contents, compared to lower ones, in the frequency distribution curve; curves tend to quickly go up and then go down in a slower way (Araldi et al, 2013). This behavior is verified in Figure 1B, with the first derivation of Gompertz model.…”

mentioning

confidence: 57%

Sensitivity of Morningglory Plants and Their Progenies to Glufosinate Ammonium

et al. 2017

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The sensitivity of weed species to herbicides is variable, and the behavior can be repeated or not in the next generation. The objective of this study was to evaluate the response of morningglory plants to different doses of glufosinate ammonium and the sensitivity of plant populations and their progenies to the herbicide. Three studies were conducted, all in a greenhouse and repeated in two periods. In the first study, two experiments were conducted to examine the dose-response curve, and the treatments were seven different doses of the herbicide glufosinate ammonium (0, 50, 100, 200, 400, 800, and 1,600 g a.i. ha-1), with four replications each. In the second study, which examined the range in sensitivity of morningglory to glufosinate ammonium, 44 plants were sprayed with a dose of 200 g a.i. ha-1 of the herbicide. Finally, in the third study, the range in sensitivity of morningglory progenies to glufosinate ammonium was investigated; in this experiment, the progenies of seven of the previous plants were sprayed with 200 g a.i. ha-1 of herbicide. The ammonium contents in the tissues were measured, and percent injury were visually assessed. Ammonium content in morningglory leaves was increased more than seven times by glufosinate application and the maximum ammonium content was observed for the highest herbicide dose. Variability existed in the ammonium content among the individuals of the morningglory population; however, the behavior was not replicated in the same way in progenies. Plants survival after herbicide application allows the production of progenies with wide variability in their sensitivity to the product, regardless of the behavior verified in progenitor plants.

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“…The position, mean, median, and mode data measurements were different from each other, and the mean and median values were higher than the modal value. This positive asymmetric distribution (Table 2) enables the identification of greater variability between the higher levels of ammonia versus the lower levels in the frequency distribution curve, with the curves tending to rise rapidly and fall more slowly (ARALDI et al, 2013). This performance is also shown in Figure 3, with the first derivative of the Gompertz model.…”

Section: Study Of Wandering Jew Plant Sensitivity To Glufosinate Ammomentioning

confidence: 75%

Variation in the Sensitivity of Wandering Jew Plants to Glufosinate Ammonium

et al. 2017

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-This study aimed to identify the response of wandering jew (Commelina benghalensis L.) plants to different doses of glufosinate ammonium and the sensitivity of plants populations to the herbicide. Two studies were conducted, both in a greenhouse, and were repeated at different times. In the first study, two experiments were conducted to examine the dose-response curve using seven different doses of the glufosinate ammonium herbicide (0, 50, 100, 200, 400, 800, and 1600 g a.i. ha -1 ) with four replicates each. In the second study, which examined the range in sensitivity of wandering jew plants to glufosinate ammonium, 26 plants were sprayed with a dose of 200 g a.i. ha -1 herbicide. Visual assessments of percent injury and measurements of leaf tissue ammonium content were conducted. The use of untreated wandering jew control plants allowed for the correlation of glufosinate ammonium treatment with the ammonium concentrations in treated plant tissues; the ammonium concentration increased as a function of herbicide application, albeit not linearly with the dose. Ammonium content varied among individuals of the wandering jew plant population.Keywords: Ammonia. Commelina benghalensis L.. Glutamine synthetase. Weed. VARIAÇÃO DA SENSIBILIDADE DE PLANTAS DE TRAPOERABA AO AMÔNIO GLUFOSINATERESUMO -Esse trabalho teve como objetivo identificar a resposta de plantas de trapoeraba (Commelina benghalensis L.) a diferentes doses de amônio glufosinate e a sensibilidade de uma população de plantas ao herbicida. Foram realizados dois estudos, ambos implantados em casa de vegetação e repetidos em diferentes momentos. No primeiro, referente à curva de dose-resposta, realizou-se dois experimentos, tendo como tratamentos sete doses do herbicida amônio glufosinate (0; 50; 100; 200; 400; 800; 1600 g i.a. ha -1 ), com quatro repetições cada. Já no segundo, referente à variação da sensibilidade da trapoeraba ao amônio glufosinate, 26 plantas foram pulverizadas com a dose de 200 g i.a. ha -1 do herbicida. Realizou-se avaliações visuais de injúria e análises do teor de amônia nos tecidos foliares. O controle de plantas de trapoeraba pelo amônio glufosinate pode ser correlacionado ao teor de amônia nos tecidos vegetais, que aumenta em função da aplicação do herbicida, porém não de forma linear em função da dose. Houve variabilidade quanto ao teor de amônia entre indivíduos de uma população de trapoeraba.Palavras-chave: Amônia. Commelina benghalensis L.. Glutamina sintetase. Planta daninha.

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Variação do tamanho de sementes de plantas daninhas e sua influência nos padrões de emergência das plântulas

Cited by 9 publications

References 16 publications

Emergency Brachiaria Decumbens a Function of Depth of Seeds in Soil Profile

Emergency Brachiaria Decumbens a Function of Depth of Seeds in Soil Profile

Sensitivity of Morningglory Plants and Their Progenies to Glufosinate Ammonium

Variation in the Sensitivity of Wandering Jew Plants to Glufosinate Ammonium

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