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| Registros recuperados: 221 | |
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| COSTA, J. R. da; MITJA, D.; FONTES, J. R. A.. |
| Este estudo investigou a densidade de sementes e a riqueza de espécies dos bancos de sementes de plantas daninhas em cultivos de mandioca (Manihot esculenta), em pequenas propriedades rurais localizadas em Manacapuru, Amazonas. Nos cultivos foram estabelecidas quatro parcelas, de onde foram coletadas 20 amostras (0,0225 m2) de 15 x 15 cm(0,0225 m2) na camada de 0-5 cm e três amostras nas profundidades de 5-10 e 10-30 cm,totalizando 104 amostras. Para a contagem e identificação das sementes, utilizou-se a técnica de emergência de plântulas em casa de vegetação. As plântulas foram identificadas,inicialmente, por morfotipo e, quando possível, até espécie. O monitoramento foi feito durante nove meses. Houve diferença significativa na densidade de sementes... |
| Tipo: Separatas |
Palavras-chave: Amazonas; Brasil; Herbáceas; Manacapuru; Banco de sementes; Weed; Herbaceous; Seed bank; Amazon.; Erva Daninha; Mandioca; Manejo; Manihot Esculenta.; Brazil; Cassava; Crop management.. |
| Ano: 2009 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/962413 |
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| FERREIRA,S.D.; EXTECKOETTER,V.; GIBBERT,A.M.; BARBOSA,J.A.; COSTA,N.V.. |
| ABSTRACT: Selecting glyphosate-resistant Digitaria insularis may cause changes in the biological cycle of the species. Therefore, the objective of this study was to evaluate the biological cycle of susceptible and glyphosate-resistant D. insularis biotypes in two growth periods (summer/autumn and autumn/winter). Seeds were collected in the municipality of Alagoa Grande (07o02’59" S 35o37’01,5" W), and were considered susceptible (S1), in Cascavel (24o55’27" S 53o27’54.6 ”W) considered as resistant 1 (R1), Entre Rios do Oeste (24o40’44" S 54o17’05" W) considered as resistant 2 (R2) and Marechal Cândido Rondon (24o42’30" S 54o21’10" W) considered as resistant 3 (R3). Evaluations were carried out in the summer/autumn and autumn/winter periods. The collection... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digitaria insularis; Growth analysis; Weed; Chemical control. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100276 |
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| AKHTAR,R.; JAVAID,A.. |
| ABSTRACT: Onion is attacked by destructive soil-borne fungal plant pathogen Fusarium oxysporum f. sp. cepae, resulting in basal rot disease. In the present study, three Trichoderma species (T. pseudokoningii, T. harzianum and T. reesei) and leaves of solanaceous weed Withania somnifera were used for management of this disease. The in vitro interaction study revealed T. harzianum as the most effective biocontrol agent against the pathogen. In a pot trial, dried leaf material of W. somnifera (1%, 2% and 3% w/w) and inoculum of T. harzianum were mixed in the pot soil previously inoculated with the pathogen. The highest incidence of the disease (87%) was found in positive control (pathogen inoculation without any amendment). Different rates of dry leaf... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Basal plate rot; Biological control; Weed; Withania somnifera. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100216 |
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| Santos,Márcia Vitória; Ferreira,Francisco Affonso; Freitas,Francisco Cláudio Lopes de; Fonseca,Dilermando Miranda da; Carvalho,Abner José de; Braz,Thiago Gomes dos Santos. |
| This study was carried out with the aim of assessing the efficacy of the fluazifop-p-butyl herbicide to control Brachiaria brizantha, cultivar Marandu, in the formation of Tifton 85 grazing. Treatments consisted of five doses of fluazifop-p-butyl herbicide (0.0, 62.5, 125.0, 187.5 and 250.0 g ha-1) plus controls with no herbicide, in a completely randomized layout, with four replications. Each plot consisted of a 10-L capacity pot, with two B. brizantha plants and two Tifton 85 plants. The herbicide application was conducted before the tillage of B. brizantha, when they were about 15 cm high. Visual assessments of control of B. brizantha and intoxication of Tifton 85 plants, at 07, 21 and 45 days after application were carried out. Sixty days after... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chemical control; Tolerance; Weed. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200007 |
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| Dias,Guilherme Faus da Silva; Alves,Pedro Luís da Costa Aguiar; Dias,Tomás Carneiro de Souza. |
| Brachiaria decumbens is becoming one the most common weeds growing in young coffee orchards because, besides its fast growth and difficulty of control, new coffee orchards are usually established in pasture areas. In order to verify the effect of B. decumbens plant density on the early growth of coffee (Coffea arabica L. cv. Catuaí Amarelo), a competition experiment was conducted under semi-controlled humidity conditions. Soil collected in a Typic Haplustox was placed in 70 L asbestos cement boxes and one coffee seedling was planted in each box. The B. decumbens seedlings were transplanted to the boxes at the 2-4 leaf stage. Treatments consisted of 0, 4, 8, 12, 16, 20, 24, 36, 48, and 60 weeds m-2. The experimental period started 120 days after... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed; Coffee; Competition; Growth suppression. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600003 |
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| VIDAL, R. A.; CHRISTOFFOLETI, P. J.; NOLDIN, J. A.; PURISSIMO, C.; PITELLI, R. A.; SILVA, J. B.; GAZZIERO, D.; ABADE, L. R.; HIDALGO, E.; KISSMANN, K. G.; LEONEL Jr. F. L.; MIYASAKI, J.; OLIVEIRA, N. A.; SCHUM, K.. |
| Tipo: Parte de livro |
Palavras-chave: Planta daninha; Weed; Herbicide; Resistance.; Herbicida; Resistência.. |
| Ano: 1997 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/478908 |
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| Battistus,A.G.; Klein,J.; Costa,N.V.; Guimarães,V.F.; Hoffmann,V.. |
| Species of the orchidaceae family are grown for marketing flowers and among them the genus Cattleya stands out. However, due to its slow growth, the substrate is subjected to weed infestation. Therefore, this study aims to evaluate the selectivity and efficiency of herbicides in controlling Pilea microphylla in Cattleya orchid seedlings (Cattleya tenebrosa x Cattleya leopoldy). We used a completely randomized design with four replications. The evaluated herbicides were oxyfluorfen (0, 120, 240 and 480 g ha-1), flumioxazin (0, 12.5, 25 and 40 g ha-1), nicosulfuron (0, 20, 40 and 80 g ha-1) mesotrione (0, 96, 144 and 192 g ha-1), clethodim (0, 60, 84 and 108 g ha-1) and metsulfuron-methyl (0, 1.2, 1.8 and 2.4 g ha-1). At post-emergence applying time, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed; Herbicide; Floriculture; Selectivity. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000400015 |
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| FERREIRA,S.D.; SALVALAGGIO,A.C.; MORATELLI,G.; VASCONCELOS,E.D.; COSTA,N.V.. |
| ABSTRACT: The objective of this study was to evaluate the chemical control of the species C. benghalensis and C. erecta with desiccants alone and mixtures, as well as the spreading of spray droplets on the leaf surfaces. The experimental design was completely randomized in a 2 x 16 factorial arrangement with four replications, totaling 32 treatments and 128 plots. The first factor is related to the species C. benghalensis and C. erecta and the second factor corresponds to the treatments carfentrazone-ethyl in doses of 15, 30, 60 g ha-1, which added 0.5% v v-1 adhesive spreader; glufosinate ammonium at doses of 100, 200, 400 g ha-1, added 0.5% v v-1 mineral oil; glyphosate at 240, 480, 960 g ha-1; carfentrazone-ethyl + glufosinate ammonium in doses of 100,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed; Droplets surface tension; Spreader and sticker agent; Chemical control; Synergism. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100278 |
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| AGOSTINETTO, D.; FONTANA, L. C.; VARGAS, L.; PERBONI, L. T.; POLIDORO, E.; SILVA, B. M.. |
| A determinação dos períodos de competição das plantas daninhas com as culturas auxilia o produtor na escolha do momento mais adequado para utilizar medidas de manejo. Essa estratégia possibilita reduzir o número de aplicações de herbicidas, com consequente redução de custo e menor impacto dos agrotóxicos ao ambiente. Assim, os objetivos deste trabalho foram determinar o período anterior à interferência (PAI) de milhã (Digitaria ciliaris) na cultura do arroz irrigado, o período crítico de prevenção à interferência (PCPI) de milhã na cultura da soja e os efeitos da competição na produtividade de grãos e seus componentes. Para isso, foram conduzidos experimentos de convivência de arroz irrigado, cultivar BRS Querência, com milhã, por períodos iniciais... |
| Tipo: Artigo de periódico |
Palavras-chave: Planta daninha; Weed; Interferência.; Glycine Max; Oryza Sativa.; Digitaria ciliaris.. |
| Ano: 2014 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1005045 |
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| Wandscheer,A.C.D.; Rizzardi,M.A.; Reichert,M.. |
| Competition between plants is one of the main interferences that occurs in agricultural systems and accounts for significant crop yield reductions. The aim of this study was to assess the competitive ability of corn in coexistence with the weed species Eleusine indica. The experiments were conducted in a greenhouse, in the growing season 2010/2011, and were arranged in a completely randomized design with four replications. The experimental units consisted of plastic pots with a volumetric capacity of 8 L. Treatments were arranged in a replacement series with five proportions of corn plants and weed: 100:0, 75:25, 50:50, 25:75, and 0:100, respectively, with a constant population of eight plants per pot, at the end of each treatment. The competitiveness... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Competition; Weed; Eleusine indica; Zea mays. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000200005 |
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| YORINORI, J. T.; GAZZIERO, D. L. P.. |
| In the 1980/81 crop season the National Soybean Research Center of EMBRAPA, Brazil, initiated a biological control program for milk weed, Euphorbia heterophylla. It is estimated that ca. 200.000 ha of cropland, mainly soybeans, is infested, demanding an expenditure of ca. US$ 3.7 million worth in chemicals for 1987/88 season. A naturally-occurring Helminthosporium species was found to be virulent on most populations of the weed. The majority of the populations are uniformly susceptible, some are uniformly immune and others are mixed-susceptible, immune and plants with varying degrees of infection. Germination of spores in mixtures with herbicides bentazon, sethoxydin and surfactant was unaffected, but was severely affected by fomesafen and the surfactant... |
| Tipo: Separatas |
Palavras-chave: Planta daninha; Helminthosporium sp; Brasil; Parana; Weed; Controle Biológico; Euphorbia Heterophylla; Brazil; Biological control. |
| Ano: 1989 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/458373 |
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| Registros recuperados: 221 | |
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