Consulta: subjectFacets:"Weeds"
Registros recuperados: 150
Data/hora: 10/06/2024 09:08:42

BIOLOGICAL EFFECTIVENESS OF ONION PLANT PROTECTION SCHEME
Provedor de dados: 196
Autores: Bondarenko, Anastasia; Tyutyuma, Natalya.
The average yield of bulb onions is still quite low. The purpose of this study was to improve the techniques and methods of cultivating onions using new generation preparations against the background of N180P60K60 in a drip irrigation method. To achieve the objective of this study, field surveys, observations and measurements were carried out using generally accepted methods. The experimental data obtained from the studies were processed using analysis of variance in Excel, which is part of the Microsoft Office installation package. Field experience included both background application of mineral fertilizers, as well as integrated nutrition of plants with Aminofol Plus and Novosil bulb onion growth stimulants and its biological protection with drugs...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bulb onions; Processing; Herbicide; Trips; Weeds; Yield; Bulbo de cebolas; Processamento; Herbicida; Viagens; Ervas daninhas.
Ano: 2022
URL: http://periodicosonline.uems.br/index.php/agrineo/article/view/6930

Pollen dispersal and deposition in an agroecosystem at Province of Buenos Aires, Argentina
Provedor de dados: 66
Autores: Madanes,Nora; Fernández,Celina A.
The aim of this study is to analyze factors and mechanisms involved in dispersal and deposition of airborne pollen captured with Tauber type traps in a 20 x 20 m plot of Helianthus annus cultivation and accompanying weeds and to investigate the relation of these processes with the vegetation structure and dynamics from cultivation to its senescence over a 14 week period. Weekly samples obtained with pollen traps showed a significant change in the deposition due to a filter effect and dispersal patterns due to source variations during the time elapsed. A conceptual and interpretative model for both processes and its relation to pollen sources is proposed. Our results showed that in the study site, the leaves development of Helianthus annus produced a pollen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Airborne pollen; Phenology; Helianthus annus; Weeds.
Ano: 2018
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0011-67932018000100003

Epidemiología y detección de begomovirus y Candidatus Liberibacter psyllaurous en plantaciones comerciales de tomate (Solanum lycopersicum L.).
Provedor de dados: 32
Autores: Hernández Flores, Benjamín.
El tomate es una de las especies vegetales más importantes en el mundo. La producción de este cultivo es considerada como una actividad de alto riesgo debido a su gran susceptibilidad a plagas que limitan su producción. En años recientes, se observaron síntomas de detención general del crecimiento, clorosis, deformación foliar, abscisión de flores y reducción de tamaño y cantidad de frutos, característicos de infección por begomovirus y Candidatus Liberibacter psyllaurous en plantas de tomate cultivadas en invernadero en los estados de Coahuila, Puebla e Hidalgo. Con la finalidad de determinar la presencia de estos patógenos se colectó tejido foliar de plantas de tomate y de malezas que mostraban los síntomas antes descritos. Se realizó la extracción de...
Palavras-chave: Mosca blanca; Geminivirus; Malezas; Bactericera cockerelli; Análisis temporal; Whiteflies; Weeds; Temporal analysis; Fitopatología; Doctorado.
Ano: 2013
URL: http://hdl.handle.net/10521/1884

Vegetación y etnobotánica de milpas y potreros en la región de Los Choles, en el municipio de Candelaria, Campeche.
Provedor de dados: 32
Autores: Guillermo Gómez, María Asunción.
Los potreros están cubriendo una proporción cada vez más grande del trópico húmedo de México, mientras el área de selvas y del cultivo de maíz ha ido en descenso. Pero, existe muy poca información sobre la composición florística y ecológica de estos pastizales inducidos. En este trabajo se compara la florística, fitogeografía, diversidad, etnobotánica y usos de la vegetación en milpas y potreros en el municipio de Candelaria, Campeche, entre la población de la etnia chol; además de que se describe el manejo de cada tipo de vegetación (milpa/potrero) con detalle. Se parte de la premisa que las milpas tendrán mayor diversidad, una proporción más grande de especies nativas y útiles, y que son recolectadas en cantidades mayores que los potreros, por ser el...
Palavras-chave: Arvense; Diversidad; Cobertura; Frecuencia; Aprovechamientos; Weeds; Diversity; Coverage; Frequency; Uses; Botánica; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/2091

Lista florística de la Barranca de Monte Obscuro, municipio de Emiliano Zapata, Veracruz, México.
Provedor de dados: 32
Autores: Torres Cantú, Gerardo Benjamín.
Se realizó un análisis de la composición florística de La Barranca de Monte Obscuro. El área de estudio se localizó dentro del municipio de Emiliano Zapata, en la zona cálido subhúmeda del centro del estado de Veracruz. En el área la heterogeneidad del paisaje determina la presencia de tres tipos de vegetación: selva baja caducifolia, encinar tropical y selva alta y mediana subperennifolia. Se presenta una lista florística que incluye 635 especies, 428 géneros y 123 familias. Del análisis del inventario se estima que la familia con mayor número de especies fue Orchidaceae, seguida por Asteraceae y Leguminosae. La selva baja caducifolia fue el tipo de vegetación con mayor diversidad de plantas vasculares seguida por el encinar tropical y la selva alta y...
Palavras-chave: Composición florística; Tipos de vegetación; Lista florística; Malezas; Conservación; Floral composition; Types of vegetation; Floral list; Weeds; Conservation; Botánica; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/1979

Etnobotánica comparativa de plantas comestibles recolectadas en sistemas de agricultura tradicional de México y Zimbabwe
Provedor de dados: 32
Autores: Manduna, Idah Tichaidza.
La recolección de plantas comestibles es un componente importante en sistemas de  agricultura tradicional. Estas plantas forman parte de las dietas locales. El objetivo de esta  investigación fue comparar el conocimiento y uso de plantas comestibles recolectadas que  complementan la dieta basada en maíz en comunidades rurales, con el fin de identificar  patrones generales en dos poblaciones con condiciones similares, pero sin contactos directos  en el pasado. Se recopiló información en Santa Catarina Roatina y Villa Talea de Castro de  Oaxaca, México y Chipupuri y Maradzika de Honde Valley, Zimbabwe mediante entrevistas  grupales e individuales, diarios de alimentos y observación participante. También se  muestrearon los arvenses de cultivos de maíz para...
Tipo: Tesis
Palavras-chave: Conocimiento etnobotánico; Arvenses; Origen biogeográfica; Doctorado; Botánica; Doctorado; Botánica; Ethnobotanical knowledge; Weeds; Biogeographical origins.
Ano: 2008
URL: http://hdl.handle.net/10521/1521

Impacts of Type of Fallow and Invasion by Chromolaena odorata on Weed Communities in Crop Fields in Cameroon
Provedor de dados: 7
Autores: Ngobo, Martine; IITA; m.ngobo@cgiar.org; McDonald, Morag; University of Wales, Bangor; mamcd@bangor.ac.uk; Weise, Stephan; ; s.weise@cgiar.org.
In the humid forest regions of southern Cameroon in central Africa, sectoral and macroeconomic policy reforms introduced in the late 1980s have led to intensified land use, which in turn has resulted in, among other environmental consequences, shortened fallow systems dominated by the Asteraceae shrub, Chromolaena odorata (L.) King and Robinson, rather than by secondary forest species. A trial was established to determine the effect of shortened fallow duration and invasion by C. odorata on the weed flora in subsequent mixed food cropping systems. Plots were established in cleared 5- to 7-year-old fallow fields in which the vegetation was either dominated by C. odorata or not, and in which the dominant fallow vegetation in the previous...
Tipo: Peer-Reviewed Reports
Palavras-chave: CVA; Cameroon; Chromolaena odorata; Fallow; Weeds.
Ano: 2004

Weed Control as a Rationale for Restoration: The Example of Tallgrass Prairie
Provedor de dados: 7
Autores: Blumenthal, Dana M; University of Minnesota; dblumenthal@npa.ars.usda.gov; Jordan, Nicholas R; University of Minnesota; perr0128@tc.umn.edu; Svenson, Elizabeth L; University of Minnesota; esvenso1@swarthmore.edu.
The potential weed control benefits of ecological restoration are rarely cited and largely unstudied. Nevertheless, the nature of many restoration target communities, i.e., diverse, late-successional communities, suggests that restoration may control weeds and that the invasibility of plant communities may decrease with both diversity and successional age. Given the high cost of weed control in nonagricultural land, weed control benefits could be a strong incentive for restoration efforts. We examined the cumulative effects of restoration on weed populations 7 yr after tallgrass prairie restoration on a Minnesota sand plain. The numbers and biomass of volunteer weeds were compared among randomized plots with (1) no restoration, (2) prairie seed addition,...
Tipo: Peer-Reviewed Reports
Palavras-chave: Community invasibility; Invasion; Prairie; Restoration; Succession; Weed competition; Weed control; Weeds.
Ano: 2003

Co-evolution of domesticated crops and associated weeds
Provedor de dados: 67
Autores: Guglielmini,Antonio C; Ghersa,Claudio M; Satorre,Emilio H.
Crops and weeds co-evolve in particular plant communities that are assembled in agro-ecosystems. In this essay we discuss the mechanisms determining this co-evolution and the processes regulating the success of individual populations within crop-weed communities as a starting point to evaluate and interpret which are the risks of promoting invasive species due to technological changes introduced into cropping activities. We follow a framework considering co-evolutionary mechanisms (namely, genetic variation, breeding system and selective forces) and demographical processes (namely, establishment, competition, dispersion) as a way to predict, not only how weeds will evolve in agricultural land, and thus how new problems for production of food and fibre...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Evolutionary mechanisms; Demographical processes; Weeds; Crops.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2007000100016

Métodos de manejo de plantas daninhas.
Provedor de dados: 14
Autores: OLIVEIRA, M. F. de; KARAM, D.; MATRANGOLO, W. J. R.
As preocupações com a disponibilidade de alimentos em quantidade e qualidade para a população em geral têm direcionado demandas de pesquisas visando o desenvolvimento de sistemas de produção de grãos de menor impacto ambiental. Isso porque os consumidores têm se tornado mais exigentes quanto aos padrões de qualidade dos produtos e do ambiente. Adicionalmente, demandam-se métodos de produção que promovam a permanência do agricultor no campo e com redução no custo de produção. Novos nichos de mercado, mesmo que pequenos, têm surgido. A área de orgânicos no Brasil é de cerca de 750 mil hectares, contando com mais de 10 mil produtores e aproximadamente 13 mil unidades de produção, mas com grande potencial de crescimento. A produção de milho orgânico exige...
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Erva daninha; Weeds.
Ano: 2015
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1037821

Plantas daninhas: cuidado com a disseminacao.
Provedor de dados: 14
Autores: GAZZIERO, D. L. P.; GUIMARAES, S. C.; PEREIRA, F. de A. R.
Plantas daninhas: cuidado com a disseminacao; Por que ocorre a disseminacao; O que fazer; Por que prevenir?; Praticas sugeridas; Atencao; Cuidado com estas plantas daninhas.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Erva daninha; Weeds.
Ano: 1989
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/457663

Resistência de plantas daninhas: tabela de classificação dos herbicidas.
Provedor de dados: 14
Autores: GAZZIERO, D. L. P.; PURÍSSIMO, C.; BRIGHENTI, A. M.; VOLL, E.; PRETE, C. E. C.; ADEGAS, F. S.
Herbicidas. Resistência. Estratégias para a prevenção da resistência. Mecanismo de ação. Classificação. Tabela de classificação dos herbicidas. Relação mecanismo de ação x marca comercial.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Herbicida; Erva daninha; Herbicides; Weeds; Herbicide-resistant weeds.
Ano: 2000
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/462076

Manejo e controle da buva resistente ao glifosato.
Provedor de dados: 14
Autores: VARGAS, L.; GAZZIERO, D. L. P.; KARAM, D.
Fatores responsáveis por aplicações ineficientes de herbicidas. Alternativas de herbicidas para uso em um programa de controle químico de buva resistente e sensível ao glifosato. Indicações de prevenção e manejo da resistência.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Erva daninha; Herbicida; Weeds; Herbicides.
Ano: 2011
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/907090

Ervas daninhas do Brasil: Solanaceae I, genero Solanum L.
Provedor de dados: 14
Autores: SACCO, J. da C.; SANTOS, E.; FROMM-TRINTA, E.; COSTA, N. L. M. da; CUNHA, M. C. S.
bitstream/item/88000/1/Doc01.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Brasil.; Erva daninha; Taxonomia.; Weeds; Solanaceae; Solanum.
Ano: 1985
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/10053

Cultivo do grão-de-bico (Cicer arietinum L.).
Provedor de dados: 14
Autores: NASCIMENTO, W. M.; PESSOA, H. B. S. V.; GIORDANO, L. de B.
Introdução: Warley M. Nascimento. Botânica e cultivares: Leonardo de B. Giordano. Clima e época de plantio: Warley M. Nascimento. Semeadura: Homero B.S.V. Pessoa. Solos e adubação: Homero B.S.V. Pessoa. Irrigação: Washington L.C. Silva. Plantas daninhas: Homero B.S.V. Pessoa. Doenças: Jorge Roland M. dos Santos. Pragas: Marina Castelo Branco. Colheita: Leonardo de B. Giordano. Armazenamento: Homero B.S.V. Pessoa. Coeficientes técnicos: Homero B.S.V. Pessoa.
Tipo: Recomendação Técnica (INFOTECA-E)
Palavras-chave: Grão-de-bico.; Sistema de produção; Praga; Inseto; Erva daninha; Doença de planta; Fungo; Pós-colheita; Lagarta; Heliothis virescens; Cicer arietinum.; Chickpeas; Cropping systems; Farming systems; Pest control; Weeds; Plant diseases and disorders; Fungal diseases of plants; Postharvest food safety.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/765566

A soja e as plantas daninhas.
Provedor de dados: 14
Autores: GAZZIERO, D. L. P.; VOLL, E.
As consequências. O que fazer? Manejo integrado.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Soja; Erva daninha; Soybeans; Weeds.
Ano: 1996
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/459837

As plantas daninhas e a resistência aos herbicidas.
Provedor de dados: 14
Autores: GAZZIERO, D. L. P.; PURÍSSIMO, C.; ADEGAS, F. S.; VOLL, E.; BRIGHENTI, A. M.; PRETE, C. E. C.
O que é? Como ocorre? Classificação dos herbicidas. Tabela periódica dos herbicidas: nome comum. Tabela periódica dos herbicidas: marca comercial. Mecanismo de ação. Manejo e Prevenção da resistência.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Plantas daninhas; Herbicidas; Erva daninha; Herbicida; Weeds; Herbicides.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/459736

Efeito alelopático de Crotalaria juncea sobre capim amargoso.
Provedor de dados: 14
Autores: MELO, T. S.; SILVA, L. B. X. da; MARQUES, R. F.; CONCENCO, G.
bitstream/item/190121/1/ORAL21.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Capim amargoso; Crotalária Juncea; Alelopatia; Erva Daninha; Weeds; Allelopathy.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1103464

Trigo como supressor de infestação de capim-amargoso.
Provedor de dados: 14
Autores: CONCENCO, G.; ITO, M. A.; MARQUES, R. F.; MELO, T. S.; SILVA, L. B. X. da; LINHARES, L. T.
bitstream/item/182555/1/COT-234-2018-GERMANI-1.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Erva Daninha; Trigo; Alelopatia; Wheat; Weeds.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1095174

Controle quiímico de plantas daninhas na cultura do milho com o uso de herbicidas pré-emergentes em Latossolo Vermelho-Amarelo distrófico em Rondônia.
Provedor de dados: 14
Autores: AZEVEDO, D. M. P. de; SILVA, J. B. da; COSTA, N. de L.; MENDES, A. M.
Este trabalho foi realizado para auxiliar o manejo químico adequado de plantas daninhas na cultura do milho a fim de fazer a recomendação de herbicidas aos produtores de milho da região do cerrado de Rondônia.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Embrapa Rondônia; Vilhena (RO); Amazônia Ocidental; Rondônia; Western Amazon.; Milho; Zea Mays; Cerrado; Latossolo Vermelho Amarelo; Erva Daninha; Controle Químico; Herbicida; Campo Experimental.; Chemical control; Weeds; Cerrado soils; Corn; Herbicides.
Ano: 1997
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/700863

Manual de identificação de plantas daninhas da cultura da soja.
Provedor de dados: 14
Autores: GAZZIERO, D. L. P.; LOLLATO, R. P.; BRIGHENTI, A. M.; PITELLI, R. A.; VOLL, E.
Família Amaranthaceae: Alternanthera tenella; Amaranthus deflexus; Amaranthus hybridus; Amaranthus spinosus; Amaranthus viridis. Família Asteraceae (Compositae): Acanthospermum hispidum; Acanthospermum australe; Ageratum conyzoides; Emilia sonchifolia; Conyza spp.; Bidens spp.; Galinsoga parviflora; Melampodium perfoliatum; Parthenium hysterophorus; Porophyllum ruderale; Senecio brasiliensis; Siegesbeckia orientalis; Sonchus oleraceus; Tridax procumbens; Família Brassicaceae: Coronopus didymus; Raphanus raphanistrum; Família Commelinaceae: Commelina benghalensis; Murdannia nudiflora. Família Convolvulaceae: Ipomoea grandifolia; Ipomoea nil; Ipomoea purpúrea; Família Euphorbiaceae: Chamaesyce hirta; Chamaesyce hyssopifolia; Croton glandulosus; Euphorbia...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Soja; Erva daninha; Soybeans; Weeds.
Ano: 2015
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1019323

Ajuste fitotécnico e competitividade de genótipos de soja BRS convencionais.
Provedor de dados: 14
Autores: TELES, B.; MARQUES, K.; GARCIA, R. A.
bitstream/item/189947/1/ORAL12.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Soja convencional; Cultivar; Erva Daninha; Weeds; Cultivars; Soybeans.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1103268

Manejo agroecológico de plantas daninhas da cultura do café.
Provedor de dados: 14
Autores: SANTOS, J. C. F.; COSTA, R. S. C. da; LEONIDAS, F. das C.; MENDES, A. M.; RODRIGUES, V. G. S.
O presente documento traz informações sobre esses métodos alternativos para uso na cultura do café, tendo como objetivo fundamental a melhoria do manejo da lavoura em propriedades rurais que praticam a cafeicultura convencional e cafeicultura de base ecológica.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Cafeicultura; Agricultura Alternativa.; Manejo; Erva Daninha; Pratica Cultural; Plant cultural practices; Coffee beans; Alternative farming.; Control methods; Weeds.
Ano: 2014
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1027715

Sistema de produção da cultura do abacaxi para o estado do Acre.
Provedor de dados: 14
Autores: ANDRADE NETO, R. de C.; NOGUEIRA, S. R.; NASCIMENTO, G. C. do; NEGREIROS, J. R. da S.; GOMES, F. C. da R.
A partir dos trabalhos integrados e sinérgicos de uma equipe com conhecimentos em diversas áreas da agricultura, a Embrapa Acre coloca à disposição dos produtores, professores e extensionistas, de forma objetiva e concisa, uma importante publicação referente à exploração racional da cultura do abacaxi. Trata-se do sistema de produção de abacaxizeiro que aborda desde questões relacionadas à importância econômica, solos, tratos culturais, manejo, controle de pragas, colheita e mercado até os coeficientes técnicos e indicadores econômicos para cultivo.
Tipo: Sistema de Produção (INFOTECA-E)
Palavras-chave: Escalonamento da produção; Piñas; Tecnología de producción; Cultivares; Producción de plántulas; Encalado; Fertilizantes; Floración; Malezas; Plagas de plantas; Enfermedades y desórdenes de las plantas; Cosecha; Tratamiento postcosecha; Rendimiento de los cultivos; Costos de producción; Análisis económico; Costos de insumos; Industralización; Procesamiento de alimentos; Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Abacaxi; Ananás Comosus; Sistema de Produção; Variedade; Muda; Produção; Calagem; Adubação; Floração; Indução; Erva Daninha; Praga de Planta; Doença de Planta; Colheita; Pós-Colheita; Rendimento; Custo de Produção; Análise Econômica; Insumo; Valor Nutritivo; Industrialização; Processamento; Pineapples; Production technology; Cultivars; Seedling production; Liming; Fertilizers; Flowering; Weeds; Plant pests; Plant diseases and disorders; Harvesting; Postharvest treatment; Crop yield; Production costs; Economic analysis; Input costs; Nutritive value; Industrialization; Food processing.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1100056

Controle de plantas daninhas: sistemas de manejo de culturas com soja e efeitos alelopáticos do ácido aconítico.
Provedor de dados: 14
Autores: VOLL, E.; ADEGAS, F. S.; GAZZIERO, D. L. P.
Resultados obtidos com ácido aconítico (AA) em experimentos: resultados iniciais obtidos a campo. Extração de ácido aconítico e testes sobre plantas daninhas: Efeitos alelopáticos do AA sobre amendoim-bravo; Efeitos alelopáticos do AA sobre corda de-viola; c) Efeitos alelopáticos do AA sobre picão-preto; d) Efeitos alelopáticos do AA sobre guanxuma. Efeitos produzidos por diferenças ambientais e de manejo. Sistemas de manejo: Sistema de manejo trigo/soja/pastagem; b) Sistema de manejo trigo/soja/pastagem em agricultura orgânica; c) Consórcio milho/ gramínea / soja ou lavoura-pecuária (ILP); Ciclo biológico e interação do banco de sementes de plantas daninhas com a cultura e o meio ambiente. O Banco de sementes de plantas daninhas e a Integração...
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Plantas daninhas; Soja; Erva daninha; Alelopatia; Competição biológica; Antagonismo; Soybeans; Weeds; Allelopathy; Plant competition.
Ano: 2013
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/970002

Amaranthus palmeri no Paraná: alerta.
Provedor de dados: 14
Autores: GAZZIERO, D. L. P.; ADEGAS, F. S.
O problema. Características. O que fazer?
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Erva daninha; Weeds.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1038351

Manejo de buva resistente ao glifosato.
Provedor de dados: 14
Autores: VARGAS, L.; GAZZIERO, D. L. P.
Manejo das plantas resistentes. Manejo no inverno. Cultivo da área. Uso de herbicida. Manejo pré-semeadura (dessecação). Controle em pré-emergência. Controle em pós-emergência. Conclusões. Tabela
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Buva; Planta daninha; Erva daninha; Weeds.
Ano: 2009
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/854360

Manual de identificação de plantas daninhas da cultura da soja.
Provedor de dados: 14
Autores: GAZZIERO, D. L. P.; BRIGHENTI, A. M.; LOLLATO, R. P.; PITELLI, R. A.; VOLL, E.; OLIVEIRA, E.; MORIYAMA, R. T.
Família Amaranthaceae Altemanthera tenella; Amaranthus deflexus; Amaranthus hybridus; Amaranthus spinosus; Amaranthus viridis; Família Asteraceae (Compositae); Acanthospermum hispidum; Acanthospermum australe; Ageratum conyzoides; Bidens spp.; Conyza spp.; Emilia sonchifolia; Galinsoga parviflora; Melampodium perfoliatum; Parthenium hysterophorus; Porophyllum ruderale; Senecio brasiliensis; Siegesbeckia orientelis; Sonchus oleraceus; Tridax procumbens; Família Brassicaceae; Coronopus didymus; Raphanus raphanistrum; Família Commelinaceae; Commelina benghalensis; Família Convolvulaceae; Ipomoea grandifolia; Ipomoea nil; Ipomoea purpúrea; Família Euphorbiaceae; Chamaesyce hirta; Chamaesyce hyssopifolia; Croton glandulosus; Euphorbia heterophylla; Phyllanthus...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Soja; Erva daninha; Soybeans; Weeds.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/469956

Manejo integrado de plantas daninhas na soja após milho e braquiária no outono-inverno.
Provedor de dados: 14
Autores: MELO, T. S.; ABREU, H. K. A. de; FACHINELLI, R.; CORREIA, M. V.; CECCON, G.
bitstream/item/190003/1/ORAL18.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Fitossociologia; Erva Daninha; Soja; Plantio Direto; Weeds; Soybeans; No-tillage.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1103329

Uso de lança-chamas e radiação infravermelha no controle de plantas daninhas.
Provedor de dados: 14
Autores: MARCHI, G.; SILVA, M. R. da; MARCHI, E. C. S.
bitstream/CPAC-2010/30293/1/doc-225.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Planta daninha; Organic farming.; Erva daninha; Tratamento térmico; Agricultura orgânica; Weeds; Heat treatment.
Ano: 2008
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/571931

Semeadura direta da soja: fatores de eficiência no controle de plantas daninhas e recomendações.
Provedor de dados: 14
Autores: VOLL, E.; DAVIS, G. G.; CERDEIRA, A. L.
Implantacao do sistema; Caracterizacao do sistema; Alternativas de controle; Fatores de eficiencia no controle; Manejo da area e das culturas; Especies, niveis da infestacao e desenvolvimento das invasoras; Restos de cultura; Herbicidas dessecantes e residuais em separado; Herbicidas dessecantes e pos-emergentes; Combinacoes e misturas de herbicidas dessecantes, residuais e pos-emergentes; Outros fatores; Modo de aplicacao; Recomendacoes.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Soja; Erva daninha; Plantio direto; Soybeans; Weeds; No-tillage.
Ano: 1980
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/444496

Controle eficiente de plantas daninhas.
Provedor de dados: 14
Autores: OLIVEIRA, M. F. de; VIVIAN, R.
bitstream/item/53632/1/Controle-eficiente.pdf
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Planta daninha; Herbicida; Weeds; Herbicides.
Ano: 2012
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/914708

Manejo de plantas daninhas na safrinha: banco de sementes e produção de soja.
Provedor de dados: 14
Autores: PIRES, N. L.; IKEDA, F. S.; MARCHI, G.; MARCHI, E. C. S.; GAZZIERO, D. L. P.
bitstream/CPAC-2010/31559/1/bolpd-260.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Planta daninha.; Herbicida.; Weeds; Herbicides.
Ano: 2009
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/697416

Impacto econômico da resistência de plantas daninhas a herbicidas no Brasil.
Provedor de dados: 14
Autores: ADEGAS, F. S.; VARGAS, L.; GAZZIERO, D. L. P.; KARAM, D.; SILVA, A. F. da; AGOSTINETTO, D.
bitstream/item/162704/1/CT132-OL.pdf
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Erva daninha; Herbicida; Weeds; Herbicides.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1074026

Uso e manejo de herbicidas em pastagens.
Provedor de dados: 14
Autores: OLIVEIRA, M. F. de; WENDLING, I. J.
bitstream/item/101756/1/doc-165.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Controle químico; Herbicida; Erva daninha; Pastagem; Weeds; Herbicides.
Ano: 2013
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/982988

Dessecação antecipada reduz incidência de ervas daninhas.
Provedor de dados: 14
Autores: OLIVEIRA, M. F. de; KARAM, D.
bitstream/item/40971/1/Dessecacao-antecipada.pdf
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Planta daninha; Weeds.
Ano: 2011
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/899386

Controle de plantas invasoras em lavouras de café em formação no Estado do Acre.
Provedor de dados: 14
Autores: OLIVEIRA, V. H. de; ALVARENGA, M. I. N.; SALES, F. de.
A existência de áreas potenciais, ecologicamente favoráveis à cultura do café, levou o governo do estado do Acre a incluí-la, ao lado da seringueira e castanheira, como opção de cultivo nos projetos de colonização, em vários municípios acreanos. Além dos aspectos agronômicos favoráveis, confirmados pelas plantações existentes que, na grande maioria, são efetuados por pequenos produtores, a cultura do café é sócio-economicamente viável, com amplas possibilidades de êxito na região. O cafeeiro, como a maioria das culturas, é muito sensível a infestação e ocorrência natural de plantas daninhas que, devido às condições de umidade e temperatura da região, têm desenvolvimento exuberante, concorrendo com a cultura em nutrientes, água e luz. Não há dúvida de que o...
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Rio Branco (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Control químico; Malezas.; Cafeeiro; Controle natural; Control biológico; Café Catuaí; Coffea arábica; Erva daninha; Controle químico.; Weeds; Biological control; Chemical control.
Ano: 1985
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/492329

Importância do manejo de entressafra.
Provedor de dados: 14
Autores: VIVIAN, R.; OLIVEIRA JÚNIOR, R. S. de; OLIVEIRA, M. F. de; KARAM, D.
bitstream/item/57789/1/Importancia-manejo.pdf
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Planta daninha; Controle; Weeds.
Ano: 2012
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/922490

A buva (Conyza spp.) pode ser considerada planta hospedeira de Spodoptera frugiperda e Helicoverpa armigera?
Provedor de dados: 14
Autores: MENDES, S. M.; SILVA, A. F. da; CARVALHO, S. S. de S.; SOUZA, C. da S. F.
bitstream/item/149620/1/ct-215.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Planta daninha; Erva daninha; Lagarta; Praga de planta; Weeds; Insect larvae; Plant pests.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1055931

Caracterização e manejo de Amaranthus palmeri.
Provedor de dados: 14
Autores: GAZZIERO, D. L. P.; SILVA, A. F. da.
Presença do caruru-palmeri no Mato Grosso, Biologia, Identificação, Manejo do caruru-palmeri.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Erva daninha; Weeds.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1069527

Levantamento da resistência de plantas daninhas a herbicidas no Oeste Baiano.
Provedor de dados: 14
Autores: SILVA, A. F. da; COSTA, A. G. F.; KARAM, D.; GAZZIERO, D. L. P.; PERINA, F. J.; ADEGAS, F. S.; VARGAS, L.; SILVA, W. T. da.
O aumento da incidência de plantas daninhas resistentes a herbicidas tem elevado o custo de produção do agricultor. A realização do monitoramento da dispersão destas espécies é prática importante para detecção do problema na sua fase inicial, e assim serem estabelecidas estratégias de controle para evitar a dispersão para novas áreas. Objetivando caracterizar a presença de plantas daninhas resistentes a glifosato, no Oeste Baiano, sementes de biótipos com suspeita de resistência foram coletadas nos municípios de Barreiras, Lagoa Formosa e São Desidério. A Embrapa e seus parceiros esperam com esta iniciativa alertar os produtores da região sobre a presença de biótipos resistentes a glifosato e sobre a importância de se estabelecer medidas de controle para...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Erva daninha; Resistência a pesticida; Herbicida; Weeds; Herbicides.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1088065

Amaranthus palmeri no Brasil.
Provedor de dados: 14
Autores: GAZZIERO, D. L. P.; ADEGAS, F. S.
Características. Informações adicionais.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Caruru; Erva Daninha.; Weeds; Amaranthus palmeri.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1033720

Produção de milho e sorgo em várzea.
Provedor de dados: 14
Autores: PARFITT, J. M. B.
ECOFISIOLOGIA E FENOLOGIA DAS CULTURAS DO MILHO E DO SORGO (Paulo Regis Ferreira da Silva; Gilber Argenta pag 7-18); NUTRIÇÃO, CORREÇÃO DO SOLO E ADUBAÇÃO (Walkyria Bueno Scivittaro pag 19-26); SISTEMAS DE CULTIVO DE MILHO EM VÁRZEA - PLANTIO DIRETO (Francisco de Jesus Vernetti Junior; Algenor da Silva Gomes pag 27-38); IMPLANTAÇÃO DA LAVOURA DE MILHO (Marilda Pereira Porto; Claudio Alberto Sousa da Silva; José Maria Barbat Parfitt; Silvio Steinmetz pag 39-43); CULTIVARES DE MILHO (Marilda Pereira Porto pag 45-55); MANEJO DA CULTURA DO SORGO (Antonio André Amaral Raupp pag 57-59); DRENAGEM E IRRIGAÇÃO PARA MILHO E SORGO CULTIVADOS EM ROTAÇÃO COM ARROZ IRRIGADO (Claudio Alberto Souza da Silva; José Maria Barbat Partitt pag 61-72); ADEQUAÇÃO DA ÁREA PARA A...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Terras baixas.; Milho; Sorgo; Fisiologia Vegetal; Fenologia; Nutrição; Solo; Adubação; Sistema de Cultivo; Doença de Planta; Drenagem; Irrigação; Semeadura; Erva daninha; Praga de planta; Secagem; Armazenamento; Varzea; Produção.; Corn; Sorghum (Poaceae); Plant physiology; Phenology; Nutrient management; Cropping systems; Plant diseases and disorders; Drainage; Irrigation; Sowing; Weeds; Drying; Storage; Lowlands.
Ano: 2000
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/743586

Milho: plantas daninhas são ameaça que se renova ano após ano.
Provedor de dados: 14
Autores: KARAM, D.; CRUZ, M. B. da.
bitstream/item/55169/1/Milho-plantas.pdf
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Planta daninha.; Milho; Zea Mays.; Weeds; Corn.
Ano: 2007
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/490795

Percepção da ocorrência de plantas daninhas resistentes a herbicidas por produtores de soja-milho safrinha no Estado de Mato Grosso.
Provedor de dados: 14
Autores: SILVA, A. F. da; KARAM, D.; SILVA, W. T da; VARGAS, L.; GAZZIERO, D. L. P.; ADEGAS, F. S.
O aumento da incidência de plantas daninhas resistentes a herbicidas se destaca como um dos principais desafios enfrentados pelos produtores de grãos do Estado de Mato Grosso. O manejo equivocado dessas plantas pode afetar negativamente a produtividade das culturas e onerar o custo de produção. Objetivando caracterizar a percepção dos produtores de soja e milho safrinha com relação à distribuição da incidência de plantas daninhas resistentes a herbicidas, a Associação de Produtores de Soja e Milho do Mato Grosso (Aprosoja-MT) e a Embrapa visitaram diversas propriedades do estado, levantando informações sobre este problema. A Embrapa e seus parceiros esperam, com essa iniciativa, contribuir para a melhor caracterização do sistema de produção de soja e milho...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Glyxine max.; Erva daninha; Zea mays; Herbicida.; Weeds; Herbicides.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1069750

Seletividade de atrazine e [paraquat + diuron] em Crotalaria spp. e controle de soja voluntária.
Provedor de dados: 14
Autores: IKEDA, F. S.; RUBENICH, A. K.; OLIBONE, A. P. E.; SMANIOTTO, L. D.; CAVALIERI, S. D.; SILVA, A. de J.; WOIAND, H. M. G.
Resumo: Na sucessão soja-milho+crotalária, há dificuldade no controle da soja voluntária no consórcio. Por isso, objetivou-se neste estudo, identificar doses, épocas e modalidades de aplicação de atrazine e de [paraquat+diuron] em pré-emergência para o controle da soja voluntária seletivos para Crotalaria ochroleuca e Crotalaria spectabilis. Foi conduzido um ensaio para cada cultura com 12 tratamentos {testemunha sem aplicação, combinações de doses (250 g i.a ha-1 e 500 g i.a ha-1) e modalidades/épocas de aplicação de atrazine [pré-emergência (PRÉ), PRÉ e pós-emergência (PÓS) aos 14 dias ou 21 dias após a semeadura (DAS) e sequencial em PÓS aos 14 DAS e 28 DAS), além dos tratamentos de [paraquat+diuron] [500+250 g i.a ha-1] em PRÉ, associado ou não às duas...
Tipo: Folhetos
Palavras-chave: Crotalaria ochroleuca; Planta Daninha; Controle Químico; Crotalária; Fitotoxicidade; Herbicida; Erva Daninha; Crotalaria spectabilis; Chemical control; Phytotoxicity; Herbicides; Weeds.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1138172

Plantas invasoras hospedeiras de Orthezia praelonga Douglas (Hemiptera: Ortheziidae) em pomares de Citrus nos municípios de Limeira e Mogi Mirim (SP).
Provedor de dados: 14
Autores: SKORUPA, L. A.; CESNIK, R.
A cochonilha Orthezia praelonga, também conhecida como "piolho branco", um importante inseto associado à cultura do Citrus no Brasil, é responsável por prejuízos na cultura em vários estados brasileiros (Cassino et al., 1991). Os danos causados pelo inseto estão relacionados à sucção da seiva, bem como a inoculação de substâncias toxicogênicas que interferem no desenvolvimento das plantas, ao mesmo tempo em que promovem a queda das folhas e dos frutos. A proliferação do fungo Capnodium sp. ("fumagina") nas excretas da cochonilha, depositadas sobre as partes vegetativas e reprodutivas das plantas, também é considerada um fato danoso, uma vez que compromete a eficiência dos processos respiratórios e fotossintéticos da planta (Lima, 1981). Além do Citrus, o...
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Brasil; Citro; Citros; Cultura; Hospedeira; Identification; Limeira; Mogi Mirim; Mogi-Mirim; Orthezia praelonga Douglas; Piolho branco; Planta daninha; Plantas invasoras; Sao Paulo; Cochonilha; Cochonilha Branca; Erva Daninha; Espécie; Fruta Cítrica; Hospedeiro; Identificação; Inseto; Lima; Orthezia Praelonga; Planta; Planta Hospedeira; Pomar; Praga; Praga de Planta; Brazil; Citrus; Citrus fruits; Hosts; Pests; Weeds.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1118971

Capim-amargoso resistente ao glifosato.
Provedor de dados: 14
Autores: GAZZIERO, D. L. P.; ADEGAS, F. S.; FORNAROLLI, D. A.; LÓPES OVEJERO, R. F.
O problema. O que é? Como controlar? Importante.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Erva daninha; Weeds.
Ano: 2013
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/946630

Plantas medicinais de ocorrencia em Roraima, consideradas plantas daninhas.
Provedor de dados: 14
Autores: LUZ, F. J. de F.
Tipo: Folhetos
Palavras-chave: Plantas medicinais; Brasil; Roraima; Drug plants; Erva Daninha; Brazil; Weeds.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/688499

Preliminary assessment of Hedychium coronarium essential oil on fibrinogenolytic and coagulant activity induced by Bothrops and Lachesis snake venoms
Provedor de dados: 80
Autores: Miranda,Cíntia A SF; Cardoso,Maria G; Mansanares,Mariana E; Gomes,Marcos S; Marcussi,Silvana.
Background The search for new inhibitors of snake venom toxins is essential to complement or even replace traditional antivenom therapy, especially in relation to compounds that neutralize the local effects of envenomations. Besides their possible use as alternative to traditional antivenom therapy, some plant species possess bioactive secondary metabolites including essential oils, which can be extracted from weeds that are considered substantial problems for agriculture, such as Hedychium coronarium.Methods The essential oils of leaves and rhizomes from H. coronarium were extracted by hydrodistillation, and their potential inhibitory effects on the coagulant and fibrinogenolytic activities induced by the venoms of Lachesis muta,Bothrops atrox and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Volatile oils; Weeds; Natural inhibitors; Antivenom therapy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992014000200313

Preliminary checklist of the naturalised and pest plants of Timor-Leste
Provedor de dados: 16
Autores: Westaway, J.; Quintao, V.; Jesus Marca, S. de.
Timor-Leste is one of the world’s newest nations, but the island of Timor has a long history of human habitation and land use which has played a significant role in shaping the 15 current vegetation and flora. Movement of people, plants and materials has seen the introduction of hundreds of plants to Timor from foreign lands, many of which have established naturalised populations, with some exerting detrimental impacts on Timorese agriculture, the environment and livelihoods. Plant health surveys conducted by Timorese and Australian biosecurity agencies have enabled compilation of an inventory of more than 20 500 naturalised and pest plant species based largely on recent field collections (now lodged in herbaria) supplemented by observational and...
Tipo: Article / Letter to the editor
Palavras-chave: Timor-Leste; Naturalised; Weeds; Introduced; Flora; Origin.
Ano: 2018
URL: http://www.repository.naturalis.nl/record/644611

Does the presence of weeds affect Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) infestation on tomato plants in a semi-arid agro-ecosystem?
Provedor de dados: 82
Autores: Bezerra,Mary-Ann S.; Oliveira,Maria R.V. de; Vasconcelos,Simão D.
Integrated Bemisia tabaci (Gennadius) management requires quantitative knowledge on the mechanisms of persistence of pest populations in non-commercial host plants. We investigated B. tabaci oviposition preference among tomato and four weed species, and the insect population fluctuation under field conditions in the semi-arid region. At weekly intervals, we determined the level (number of eggs and nymphs per leaf) and the density of infestation (number of eggs and nymphs per leaf area) in all species. We observed an oviposition preference gradient among the species, with different degrees of attractiveness; Acanthospermum hispidum was the most infested species whereas Amaranthus deflexus was the least infested one. We also detected a significantly higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Whitefly; Weeds; Host preference; Caatinga.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2004000600015

Growth pattern off established quackgrass (Agropyron repens L. Beauv.) plants
Provedor de dados: 19
Autores: MARUYAMA, Junkoh; FUKUNAGA, Kazuo; YANAGISAWA, Junji; 丸山, 純孝; 福永, 和男; 柳澤, 淳二.
http://www.obihiro.ac.jp/~library/kenkyu.html
Palavras-chave: Agropyron repens; Weeds; Growth pattern.
Ano: 1993
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3753

Growing chickpea in Eastern Africa
Provedor de dados: 30
Autores: HenkA.van.
Palavras-chave: Rhizobium; Root nodulation; Chickpeas; Seedbeds; Fungi; Fruits; Iron; Weeds; Diseases; Tropical zones.
Ano: 1991
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4241

Relationships between transpiration efficiency and carbon isotope discrimination in chickpea (C. arietinum L)
Provedor de dados: 30
Autores: Kashiwagi, J.
Palavras-chave: Transpiration (animals); Genotypes; Chickpeas; Herbicides; Isotopes; Drought stress; Harvest index; Vegetative stage; Carbonation; Weeds.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3184

Finger Millet blast management in East Africa: creating opportunities for improving production and utilization of finger millet
Provedor de dados: 30
Autores: M.A.( Editor ).
Palavras-chave: Millets; Grain; Weeds; Germplasm; Markets; Cereals; Brewing; Control methods; Sorghum; Flours.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3274

Effects of Soil Solarization on Pigeonpea and Chickpea
Provedor de dados: 30
Autores: Y.S.
Palavras-chave: Pigeonpeas; Chickpeas; Soil solarization; Genotypes; Soil water content; Soil sampling; Dry matter; Root nodulation; Rhizobium; Weeds.
Ano: 1988
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4075

IMPROVING SOIL MANAGEMENT OPTIONS FOR WOMEN FARMERS IN MALAWI AND ZIMBABWE
Provedor de dados: 30
Autores: S.J.
Palavras-chave: Soil improvement; Soil management; Organic fertilizers; Pigeonpeas; Soil fertility; Research methods; Maize; Weeds; Crop management.
Ano: 2001
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3699

Impact of vertisol technology in India
Provedor de dados: 30
Autores: P.K.
Palavras-chave: Genetic soil types; Double cropping; Pigeonpeas; Fertilizer application; Summer; Placement; Weeds; Tillage equipment; Precipitation; Technology.
Ano: 2002
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4233

Decision criteria for optimizing postemergence johnsongrass control in soybean crops in Argentina
Provedor de dados: 86
Autores: Tuesca,Daniel; Puricelli,Eduardo; Nisensohn,Luisa; Faccini,Delma; Papa,Juan.
Field studies were established in Zavalla and Oliveros, Argentina, during four years in order to optimize Johnsongrass (Sorghum halepense (L.) Pers.) chemical control by means of the thermal calendar model in comparison with other criteria (weed height or days after sowing). The effect of three application dates of postemergence herbicides was determined by visual control, density of tillers originated from rhizome bud regrowth, and from crown and shoot bud regrowth, and soybean yield. Following the thermal calendar model criterion, applications during the second date afforded the best control. Weed height for the first date showed little variability between experiments but was highly variable in the second and third application dates, achieving in some...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weeds; Herbicides; Application timing.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000500004

Adaptability of lettuce cultivars to planting in no-tillage on straw of Urochloa ruziziensis
Provedor de dados: 86
Autores: Hirata,Andréia Cristina Silva; Hirata,Edson Kiyoharu; Camara,João Augusto Rizzo.
Abstract: The objective of this work was to evaluate the adaptability of different lettuce (Lactuca sativa) cultivars grown in no-tillage on straw of ruzi grass (Urochloa ruziziensis), as well as its effects on soil temperature and weed control, in successive cultivations in the summer. The treatments were carried out in a randomized complete block design, with four replicates, in a split-plot arrangement (2x4), in which soil management (no-tillage on ruzi grass and convention tillage) was the main plot, and the different crisphead lettuce cultivars (Amanda, Solaris, Vanda, and Vera), the subplots. No difference was observed between cultivars for soil management. No-tillage reduced the soil temperature by up to 3.7°C and weed density by 3.7 times, in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria; Lactuca sativa; Soil conservation; Soil temperature; Vegetable crops; Weeds.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000700824

Impact of increasing mean air temperature on the development of rice and red rice
Provedor de dados: 86
Autores: Lago,Isabel; Streck,Nereu Augusto; Alberto,Cleber Maus; Oliveira,Felipe Brendler; Paula,Gizelli Moiano de.
The objective of this study was to assess the development response of cultivated rice and red rice to different increases in minimum and maximum daily air temperatures, in Santa Maria, Rio Grande do Sul State, Brazil. One hundred years climate scenarios of temperatures 0, +1, +2, +3, +4, and +5ºC, with symmetric and asymmetric increases in minimum and maximum daily air temperatures were created, using the LARS-WG Weather Generator, and a 1969-2003 database. Nine cultivated rice genotypes (IRGA 421, IRGA 416, IRGA 417, IRGA 420, BRS 7 TAIM, BR-IRGA 409, EPAGRI 109, EEA 406 and a hybrid), and two red rice biotypes (awned black hull-ABHRR, and awned yellow hull-AYHRR) were used. The dates of panicle differentiation (R1), anthesis (R4), and all grains with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Global warming; Phenology; Simulation; Weeds.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008001100001

Allelopathic testing of Pedicularis kansuensis (Scrophulariaceae) on seed germination and seedling growth of two native grasses in the Tibetan plateau
Provedor de dados: 85
Autores: Shang,ZH; Xu,SG.
Abstract. Pedicularis kansuensis is a dominating poisonous weed, and it might have allelopathic effects on other native grasses in al­pine meadows. An experiment was conducted to examine a range of concentrations of aqueous whole plant extracts (25, 12.5, 2.5, 1.25, 0.25 and 0.0 g/L) of P. kansuensis, prepared at the flowering stage on seed germination and seedling growth of two native grasses (Poa pra­tensis and Elymus nutans). High concentrations of aqueous extracts of P. kansuensis inhibited seed germination and seedling growth of P. pratensis (p&lt; 0.05). Most aqueous extracts of P. kansuensis had a stimulatory (p&lt; 0.05) effect on E. nutans. Our results suggest that the allelopathic ecology of P. kansuensis on other native grasses needs further...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological allelopathy; Aqueous extracts; Weeds; Native grasses; Alpine meadows.
Ano: 2012
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000100011

SPECTRUM OF WEED CONTROL WITH 2,4-D AND DICAMBA HERBICIDES ASSOCIATED TO GLYPHOSATE OR NOT
Provedor de dados: 87
Autores: OSIPE,J.B.; OLIVEIRA JR.,R.S.; CONSTANTIN,J.; TAKANO,H.K.; BIFFE,D.F.
ABSTRACT The possibility of using auxin mimics herbicides in culture postemergence applications contributes to weed management. This study aimed at evaluating and comparing the effectiveness of 2,4-D and dicamba herbicides on glyphosate resistant or tolerant weeds. The treatments were dicamba and 2,4-D doses with or without glyphosate. The evaluated weeds in the experiment were Richardia brasiliensis, Commelina benghalensis, Conyza sp. and Ipomoea nil. Herbicides were applied when weeds were in 4 to 6 and 10 to 12 leaves stages. Data referring to evaluations on day 30 after application were submitted to analysis of variance. Response-dose curves were obtained for herbicides, and C85 and C95 values were identified. Weed species showed different tolerance to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mimics auxin; Weeds; Richardia brasiliensis; Commelina benghalensis; Conyza bonariensis; Ipomoea nil.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100251

Bioherbicidal Assessment of Aqueous Extracts of Mesquite (Prosopis juliflora) on Weeds Control and Growth, Yield and Quality of Wheat
Provedor de dados: 87
Autores: SHAH,R.H.; BALOCH,M.S.; KHAN,A.A.; IJAZ,M.; ZUBAIR,M.
ABSTRACT: Two-year field experiments were conducted to investigate the phytotoxicity of mesquite (Prosopis juliflora) on weed control and yield of wheat in 2013-14 and 2014-15. Mesquite aqueous extracts were prepared with 10, 20, 30 and 40% concentration of leaves, stems, and roots and were compared with tap water (control). These experiments were laid out in a completely randomized block design with four replications. All parameters (weed density, fresh weed biomass, dry weed biomass, chlorophyll content, leaf area index, leaf area duration, crop growth rate, net assimilation rate, plant height and number of tillers) were significantly reduced by applying the mesquite extracts. Among different concentrations, the maximum level (40%) of all three plant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelopathy; Extract; Weeds; Wheat yield.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100214

Effect of Herbicides on Yield and Yield Components of Hybrid Maize (Zea mays)
Provedor de dados: 87
Autores: KHAN,I.A.; HASSAN,G.; MALIK,N.; KHAN,R.; KHAN,H.; KHAN,S.A.
ABSTRACT Maize crop (Zea mays) is facing lots of problems from different pests throughout Asia, including Pakistan. Weed infestation is one of the serious pests that remarkably decrease the grain yield in maize. In Khyber Pakhtunkhwa province of Pakistan, the trend of maize hybrid cultivation is gaining the attention of the farmers due to its higher production. Therefore, in this research we tested herbicides (Stomp 330 E, Dual gold 960 EC, 2,4-D, ester) in maize hybrids (P-3025, P-32T78, P-3203). The experiment was done in RCB design with split plots arrangement, where maize hybrids were kept in main plots, while herbicides were assigned to the subplots. Each treatment was repeated three times at the New Developmental Farm (NDF), at the Peshawar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicides; Leaf area; Maize hybrids; Weeds.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000400729

Sequential Application of Herbicides Alone and in Mixture With and Without Foliar Fertilizer after Pruning of Cassava Plants
Provedor de dados: 87
Autores: COSTA,N.V.; SALVALAGGIO,A.C.; FERREIRA,S.D.; BARBOSA,J.A.; GIBBERT,A.M.
ABSTRACT: A new cycle of growth begins after pruning of cassava, and weed control is necessary. Thus, this study aimed to evaluate the selectivity and efficiency of sequential application of herbicides alone and in mixture with and without of foliar fertilizer after pruning of cassava. Two experiments were carried out in a randomized block design with four replications. The treatments of Experiment 1 consisted of control without weeding; control with weeding; mesotrione; mesotrione/mesotrione; mesotrione + foliar fertilizer/mesotrione + foliar fertilizer; mesotrione/mesotrione + foliar fertilizer; mesotrione + clethodim; mesotrione + clethodim + foliar fertilizer/mesotrione + clethodim + foliar fertilizer; mesotrione + clethodim/mesotrione + clethodim;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta; Weeds; Chemical control.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100204

Integration of sunflower (Helianthus annuus) residues with a pre-plant herbicide enhances weed suppression in broad bean (Vicia faba)
Provedor de dados: 87
Autores: Alsaadawi,I.S; Khaliq,A; Al-Temimi,A.A; Matloob,A.
Field trial was conducted with the aim of utilizing allelopathic crop residues to reduce the use of synthetic herbicides in broad bean (Vicia faba) fields. Sunflower residue at 600 and 1,400 g m-2 and Treflan (trifluralin) at 50, 75 and 100% of recommended dose were incorporated into the soil alone or in combination with each other. Untreated plots were maintained as a control. Herbicide application in plots amended with sunflower residue had the least total weed count and biomass, which was even better than herbicide used alone. Integration of recommended dose of Treflan with sunflower residue at 1,400 g m-² produced maximum (987.5 g m-2) aboveground biomass of broad bean, which was 74 and 36% higher than control and recommended herbicide dose applied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelopathy; Sunflower residues; Herbicide; Phytotoxins; Weeds; Broad bean.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000400015

Impact of Plant Population and Weed Control Methods on the Growth, Yield and Economic Potential of Sugarcane (Saccharum officinarum L.) Cultivation
Provedor de dados: 87
Autores: TAKIM,F.O.; SULEIMAN,M.A.
ABSTRACT: Sugarcane industries are faced with the challenges of reduced cane yield due to inability to ascertain an appropriate sugarcane planting density. Field trials were conducted at Bacita, southern Guinea savanna of Nigeria to examine appropriate planting density and weed control method that can minimize weed infestation in sugarcane field and give an optimum cane yield to improve the economic status of the sugarcane farming community. The experiment was established as a randomized complete block design in a split-plot arrangement with three replications. The main plot constituted four planting populations (43,200, 64,800, 86,400 and 108,800) plants ha-1 while the sub-plot consisted of six weed control practices (weedy check, pre-emergence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Terbuthylazine; Dicamba; Ametryn; Weeds.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100280

Weed Control in Clean Agriculture: A Review1
Provedor de dados: 87
Autores: ABOUZIENA,H.F.; HAGGAG,W.M.
ABSTRACT Weed control is consider the major obstacle for the growers in the organic farming. Lower plant productivity in organic farming mainly related to the poor weed control. It is widely known, in most cases, that losses caused by weeds exceeded the losses from any category of agricultural pests. Under water-stress condition, weeds can reduce crop yields more than 50% through moisture competition alone. In the light of the environmental and toxicological problems created by herbicides, it has become necessary to develop the safety methods for controlling weeds. Soil Solarization, Mulching, Biodegradable Mulch, Natural Herbicides, Hot Water, and Agronomic Practices have been successfully adopted in many countries as safe methods for controlling weeds in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weeds; Safety methods; Mulch; Soil solarization; Natural herbicides; Hot water; Non-traditional methods.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000200377

Floristic composition and growth of weeds under custard apple (Annona squamosa) progenies
Provedor de dados: 87
Autores: Silva,P.S.L.; Barbosa,Z.; Oliveira,O.F.; Antonio,R.P.; Silva,P.I.B.
Weeds have a negative influence on several fruit tree characteristics, such as yield, making it difficult to management practices in orchards. Alternative weed management methods, aiming to reduce the use of herbicides, have become attractive since herbicides are costly and cause environmental degradation. The use of cultivars with greater competitive ability against weeds has attracted international attention. The objective of this work was to evaluate the floristic composition and growth of weeds under the canopies of irrigated custard apple tree progenies. Twenty halfsibling progenies around three years of age were evaluated in a random block design with five replicates and four plants per plot. A circle with a 0.5 m² area was established around the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annona squamosa; Custard apple fruit; Weeds.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582004000400006

Weed Flora of Citrus Orchards and Factors Affecting its Distribution in Western Mediterranean Region of Turkey
Provedor de dados: 87
Autores: ONEN,H.; AKDENIZ,M.; FAROOQ,S.; HUSSAIN,M.; OZASLAN,C.
ABSTRACT: Citrus is an important export commodity, mostly grown on Mediterranean and Aegean coasts of Turkey. Weeds are hidden foes impairing citrus productivity. Limited knowledge of weed distribution and factors affecting the distribution are among major hurdles in successful weed management. In this study, weed flora of citrus orchards and factors affecting its distributions in Mugla province of Turkey were determined. Sixty orchards were surveyed in spring and autumn seasons of 2010 and 2011. Data relating to frequency, coverage and density of weed species were recorded. Soil samples (0-30 cm depth) were collected and analyzed for physicochemical properties. Climatic variables, altitude and soil properties were correlated with weed flora. Sixty-eight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weeds; Multivariate analysis; Soil properties; Weather.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100236

Tolerance of Cabbage Crop to Auxin Herbicides
Provedor de dados: 87
Autores: NASCIMENTO,A.L.V.; PEREIRA,G.A.M.; PUCCI,L.F.; ALVES,D.P.; GOMES,C.A.; REIS,M.R.
ABSTRACT: The presence of weeds in cabbage cultivation areas causes a reduction in the productivity and quality of the commercial product. Given the difficulties in management and the scarcity of registered products for weed control in cabbage cultivation, this study aimed to evaluate the tolerance of the cabbage cultivars Astrus Plus to the herbicides 2,4-D and dicamba. Two experiments were performed; one under controlled conditions and another conducted in the field. The efficacy of the herbicides on the initial growth of the crop was evaluated in the first experiment, measuring the dry matter of the aerial part, the root of the plant, and evaluating the intoxication of the plants. Plant poisoning was also evaluated in the second experiment, along with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea var. capitata; Auxin mimics; Weeds.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100217

WEED INCIDENCE AFTER SOYBEAN HARVEST IN NO-TILL AND CONVENTIONAL TILLAGE CROPROTATION SYSTEMS IN RORAIMA’S CERRADO
Provedor de dados: 87
Autores: ALBUQUERQUE,J.A.A.; SANTOS,T.S.; CASTRO,T.S.; MELO,V.F.; ROCHA,P.R.R.
ABSTRACT The goal of this study was to evaluate the occurrence of weeds after soybean harvest in rotational systems of no-till and conventional tillage in the savannah of Roraima, Brazil. Two simultaneous experiments were conducted in adjacent areas, the first one with no-till soil management system and the second one with the conventional system, with crop rotations for five agricultural years: pearlmillet (2007/2008), soybean (2008/2009), maize (2009/2010), cowpea with maize (2010/2011), soybean (2011/2012) and maize (2012/2013). The used experimental design was the randomized block one with 28 plots, sized 3 x 15 m (45 m2) distributed in 4 blocks. In May 2010, the combined sowing of cowpea and maize was performed, and later, during the same month of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Phytosociology; Weeds; Savannah; Morphological characteristics.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100238

Growth and Development of Digitaria insularis Biotypes Susceptible and Resistant to Glyphosate
Provedor de dados: 87
Autores: PEREIRA,,G.R.; COSTA,,N.V.; MORATELLI,G.; RODRIGUES-COSTA,A.C.P.
ABSTRACT The study aimed to evaluate the growth and development of biotypes of Digitaria insularis susceptible and resistant to glyphosate. Samples of biotypes were collected in Western Paraná in Cascavel, one susceptible (24o57'29.06" S and 53o30'23.73" W) and one resistant (24o54'54.99" S and 53o30'08.55" W; with Resistance Factor of 2.96). The experiment was arranged in a completely randomized design with four replications. The treatments consisted of different plant collection timings, carried out at regular intervals of 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 105 and 112 days after emergence. The growth curve of susceptible and resistant biotypes were similar; however, the susceptible biotypes accumulated more leaf dry mass, while the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth analysis; Chemical control; Sourgrass; Weeds.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100224

Growth and Development of Sourgrass Plants from Vegetative Parts of Clumps
Provedor de dados: 87
Autores: GAZOLA,T.; DIAS,M.F.; BONATTO,V.M.; BELAPART,D.; CARBONARI,C.A.; VELINI,E.D.
ABSTRACT: Sourgrass (Digitaria insularis) is a perennial plant with high infestation potential, has fast and aggressive development, and reproduces by seeds and rhizomes. D. insularis infestations have increased in agricultural areas without cover crops established between the main crop seasons. The control of this species has become one of the most expensive in these areas in Brazil. The present work evaluated the growth and development of D. insularis plants from different vegetative parts of clumps. Two greenhouse experiments were conducted in a completely randomized design, with four replications. A 5 × 4 factorial arrangement was used, with factor A corresponding to the different propagation methods, and factor B corresponding to the biotypes used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digitaria insularis; Weeds; Resistance to herbicides.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100182

Weeds in Second Corn Crops in the Period of Transgenic Soybean Implantation in the Middle Paranapanema Region
Provedor de dados: 87
Autores: HIRATA,A.C.S.; DUARTE,A.P.; DUARTE,R.C.R.M.
ABSTRACT: The Middle Paranapanema region concentrates a large part of the second corn production in São Paulo State. Weed surveys in commercial areas are important for monitoring and directing their management. In 2006, 2007, and 2008, weed surveys were carried out on 27, 25, and 24 corn crops, respectively, in ten counties of this region. At the grain filling stage, crops were zigzag sampled with 20 points of 1 m2 per area. In addition, information on weed management, soil cover, and history of the summer crop were collected. The phytosociological parameters frequency, density, abundance, and importance value index were determined. The results evidenced Cenchrus echinathus as the most important species in 2006 and 2007, in addition to high importance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Phytosociological survey; Weeds.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100341

Growth and mineral nutrition Of Ipomoea quamoclit
Provedor de dados: 87
Autores: Carvalho,L.B.; Bianco,S.; Pitelli,R.A.
A greenhouse experiment was carried out from November 2006 to April 2007 at FCAV/UNESP, Brazil, aiming to study the dry mass production and the accumulation and distribution of macronutrients in Ipomoea quamoclit, an important weed for annual and perennial crops in Brazil. The plants were grown in seven liter pots with sand substrate, daily irrigated with Hoagland &amp;amp; Arnon nutrient solution. The experimental design was completely randomized with four replicates. The treatments corresponded to evaluation times at 14 day intervals, beginning 21 days after emergence (DAE). In each evaluation, the plants of four pots were analyzed in function of dry mass production and macronutrient content. I. quamoclit had a small dry mass and macronutrient...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weeds; Morningglory; Dry mass; Macronutrients.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582009000200010

Influence of Nitrogen Fertilization on Herbicide Selectivity in Rice
Provedor de dados: 87
Autores: LANGARO,A.C.; AGOSTINETTO,D.; OLIVEIRA,C.; FRANCO,J.J.; ZANDONÁ,R.R.; VARGAS,L.
ABSTRACT: Chemical weed control and nitrogen fertilization are common practices in irrigated rice crops. Nitrogen is an essential element for growth and development of plants and may influence herbicide selectivity. In this study, herbicide selectivity was evaluated according to nitrogen application time in irrigated rice crops. The experiment was conducted in the field in a split-plot design with four replications. Treatments were arranged in a factorial scheme: factor A consisted of different nitrogen application times (without nitrogen, all nitrogen applied before flooding, half of the nitrogen rate applied before flooding and the other half after flooding, all nitrogen applied after flooding); factor B consisted of the application of the herbicides...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Nitrogen; Selectivity; Weeds.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100318

Exploring the Herbicidal Potential of Achyranthes aspera Against Some Weeds
Provedor de dados: 87
Autores: TANVEER,A.; SAFDAR,M.E.; FAROOQ,N.; SUDOZAI,M.I.; NADEEM,M.A.; ABBAS,T.
ABSTRACT: The phytotoxic composition of Achyranthes aspera was identified through HPLC, and its herbicidal potential was investigated against two narrow leaf weeds viz., Phalaris minor Retz. and Avena fatua L.; and four broad leaf weeds viz. Lathyrus aphaca L., Vicia sativa L., Convolvolus arvensis L. and Asphodelus tenuifolius L. through bioassays. Weed seeds were grown in the aqueous extracts of various plant parts (roots, leaf, stem, fruit and whole plant) of A. aspera at 5% (w/v) concentration. The extracts of all plant parts caused significant reductions with differential degree in germination percentage and mean germination time. Phalaris minor, A. fatua, L. aphaca, V. sativa and A. tenuifolius completely failed to germinate whereas C. arvensis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelochemicals; Germination bioassay; Natural herbicide; Weeds.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100265

Competitive Ability of Santa-Maria (Parthenium hysterophorus L.) with Spring Maize
Provedor de dados: 87
Autores: REHMAN,A.; QAMAR,R.; FAROOQ,M.; QAMAR,J.; HASSAN,F.
ABSTRACT: In recent decades, allelopathy has gained considerable attention in sustainable agricultural systems. In the current situation, an attempt has been made to investigate the optimal competition period for weed control in maize. Experiments were designed in randomized complete block design and Parthenium hysterophorus was naturally infested in experimental plots during the spring season 2014 to determine the critical competition period for weed control in maize. The relations between grain yield and different competition durations were determined via regression analyses. The experiment comprised seven treatments viz, control treatment, competition for 30, 45, 60, 75, 90 and 105 days after emergence. The results suggested that a weed-free period...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Competition; Weeds; Yields.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100252

Phytosociology of Weeds in Off-Season Maize Crops in the Middle Paranapanema
Provedor de dados: 87
Autores: GAZOLA,T.; DIAS,M.F.; DUARTE,A.P.; CARBONARI,C.A.; VELINI,E.D.
ABSTRACT: This work is the first one after the consolidation of the introduction of the RR technology in maize and soybean crops, following weed surveys previously carried out in the region of the Middle Paranapanema, São Paulo state. The objective was to carry out a phytosociological survey of weeds in off-season maize crops no-tillage, in the same properties where the studies had been previously carried out, in the described region, taking into account the management of the weed community adopted by farmers, and the percentage of plant coveron the soil. The surveys were carried out in 19 farms conducted under no-tillage systems, with off-season maize cultivated in soybean succession, both RR crops, in nine municipalities of the São Paulo region of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicides; Weeds; No-tillage; Zea mays.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100313

Allelopathic Potential of Lavender’s Extract and Coumarin Applied as Pre-Plant Incorporated Into Soil Under Agronomic Conditions
Provedor de dados: 87
Autores: NAZEMI,A.H.; ASADI,G.A.; GHORBANI,R.
ABSTRACT: This study aimed to further explore that if coumarin and lavender’s extract, similar to greenhouse conditions, are phytotoxic towards some plant species under agronomic conditions. Before planting of maize, coumarin at 0, 250, 500, 1,000, 2,000, and 4,000 g h-1 and lavender’s aqueous extract at 0, 1,000, 2,000, 4,000, 8,000, and 16,000 mL h-1 were applied and incorporated into soil at a 3-5 cm depth. The density and biomass of weeds was significantly reduced by applying both compounds. The inhibition ability was also rate-dependent. Although the density and biomass of maize was also decreased at high rates, this crop showed higher tolerant to both compounds that all weeds.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelopathy; Natural herbicides; Maize; Weeds.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100264

Effect of Different Herbicides, Plant Extracts and Mulches on Yield and Yield Components of Maize
Provedor de dados: 87
Autores: KHAN,I.A.; REHMAN,O.U.; KHAN,S.A.; HAMEED ALSAMADANY,; YAHYA ALZAHRANI,.
ABSTRACT: To examine the effect of pre emergence herbicides, plant extracts and mulches on yield and yield components of maize, a field experiment was carried out at New Developmental Farm, The University of Agriculture Peshawar-Pakistan during summer crop season 2016. Maize variety “Azam” was sown in Randomized Complete Block (RCB) design having four replications and ten treatments i.e. hand weeding, Dual Gold 960 EC (S-metolachlor 1 L ha-1), Stomp 330 EC (pendimethaline 2.5 L ha-1), atrazine 1.25 L ha-1, Eucalyptus camaldulensis L. extract (125 g L-1), Ammi visnaga L. extract (125 g L-1), black plastic mulch, wheat straw mulch, saw dust mulch and weedy check. The data revealed that hand weeding and herbicides significantly affected the weed density...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelopthy; Zea mays L.; Chemical control; Soil cover; Weeds; Crop production.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100228

Genetic variability among Commelina weed species from the states of Paraná and São Paulo, Brazil
Provedor de dados: 87
Autores: Rocha,D.C.; Rodella,R.A.; Marino,C.L.; Martins,D.
This work aims to carry out a comparative analysis using RAPD molecular markers in four Commelina weed species from the state of Paraná and C. benghalensis populations from the states of Paraná and São Paulo, Brazil. The genomic plant DNA sample was extracted from the leaves, separated, randomly fragmented and amplified by PCR. Random amplified polymorphic DNA fragments (RAPD markers) were analyzed by using POPGENE statistical program. Eighty-five primer sequences were tested but only three were suitable as molecular markers producing 37 DNA polymorphic fragments for comparisons among four Commelina species and 22 polymorphic fragments for comparisons among C. benghalensis populations. The results showed that there were inter-specific and intra-specific...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biotype; Commelinaceae; Molecular markers; Weeds.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582009000300001

Residual herbicides increase the period prior to interference in soybean cultivars
Provedor de dados: 87
Autores: Rizzardi,Mauro A.; Rockenbach,Ana P.; Schneider,Theodoro.
Abstract  Background:  The pre-emergence herbicides diclosulam and flumioxazin are used to weed control in soybean. We hypothesized management of the new emergence of weeds in the early development stages of the soybean could alter the periods of interference. Thus, the period prior to interference allows and increases the canopy closure spaces before the critical period and disfavors the development of weeds inside the vegetative canopy.  Objective:  This study aimed to evaluate whether the period prior to interference of soybean cultivars was altered due to the application of residual pre-emergence herbicides.  Methods: Two experiments were conducted with the soybean cultivars ‘NA 5909 RG’ and ‘P95R51’. One day before sowing in the main plots, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interference periods; Pre-emergence; Competition; Weeds.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100335

Performance of Crops Grown in Succession to Soybeans Treated with Different Residual Herbicides
Provedor de dados: 87
Autores: SOUSA,J.B.; TEIXEIRA,M.B.; JAKELAITIS,A.; CUNHA,F.N.; SILVA,N.F.
ABSTRACT: Herbicides with residual effect applied in soybeans may affect the productivity of late harvest crops grown in succession. Thus, the objective of this research was to evaluate the agronomic performance of adzuki bean crops, crambe, millet and palisade grass pasture grown in succession to soybean crop treated with residual herbicides, as well as assess the contribution in weed management. Four trials were conducted in field conditions at the soybean crop in the harvest and then succeeded by adzuki bean crops, crambe, millet and palisade grass as late harvest. An experimental design was adopted in a randomized block arrangement with four replications and nine treatments represented by the application of residual herbicides: imazethapyr (1.0 and 1.5...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carryover; Late harvest; Weeds; Commercial herbicides.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100204

Evolution of Ryegrass Seed Banks Depending on Soil Tillage and Crops
Provedor de dados: 87
Autores: Galvan,J.; Rizzardi,M.A.; Peruzzo,S.T.; Ovejero,R.F.
The seed bank is characterized by the amount of seeds and other viable reproductive structures in the soil and it is changed by the input and output of seeds, being classified by its permanence in the soil as transient or permanent. The tillage and crops used decisively influence this dynamic and more disturbed areas tend to have richer seed banks. The purpose of this study was to test different soil tillage and crop systems, aiming to reduce or eliminate the ryegrass in the area. The experiment was conducted from 2010 to 2012. In the first year, the effect of chemical tillage was assessed, compared to the area without tillage. From the second year on, in the area that received chemical tillage, the second experiment was installed, where it was assessed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed dormancy; Chiseling; Seeds viability; Weeds.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000200183

Period of Weed Interference in Guarana Crop
Provedor de dados: 87
Autores: SOARES,D.O.P.; ALBERTINO,S.M.F.; SOUZA,F.C.P.; SANTOS,A.F.; SILVA,J.F.
ABSTRACT: Guarana is a plant native to the Amazon region that produces the fruit known as guarana. Guarana production is carried out by small farmers and is a source of income for thousands of people in rural and urban areas. The interference caused by the competition between weeds and guarana is an important limiting factor of its production. Despite its economic and social importance, there are few studies on the management of weeds in this species. Thus, this research aimed to study the effects of weed interference on guarana yield in different periods. This study was performed in Maués, AM, in the 2014 and 2015 seasons. The experimental design was a randomized block design with eight treatments and four blocks. Treatments consisted of a combination of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Critical period; Weeds; Competition; Paullinia cupana.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100267

Weeds Biomass as Affected by Tillage Practices and Cropping Systems under a Semiarid Environment
Provedor de dados: 87
Autores: MEHMOOD-UL-HASSAN,; QAYYUM,A.; SHER,A.; TAHIR,M.I.; AZEEM,M.; FAREED,A.
ABSTRACT: Tillage practice has a significant role on weeds eradication and soil water conservation in crop production. Under semiarid agriculture, the monsoon rains (65%) are major source of water in Potohar, Pakistan, which can effectively be used mostly for winter crops production. To evaluate the impact of different tillage system for prevailing cropping systems and their weeds biomass under semiarid conditions, field experiment was conducted at the Arid University Research Farm Koont Rawalpindi (Pakistan) during crop growth seasons 2013-14 and 2014-15. Tillage systems as treatments were (a) three cultivations with a cultivator, as control treatment, (b) mold-board with two cultivations, (c) chisel-plough with two cultivations and (d) minimum tillage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tillage; Cropping systems; Weeds; Biomass; Semiarid.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100231

Application of Various Herbicides on Controlling Large and Narrow Leaf Weeds and Their Effects on Physiological and Agronomic Traits of Wheat
Provedor de dados: 87
Autores: Bari,A.; Baloch,M.S.; Shah,A.N.; Khakwani,A.A.; Hussain,I.; IQBAL,J.; Ali,A.; Bukhari,M. A.
ABSTRACT: In order to examine application of various herbicides for controlling weeds in wheat crop, a field trial was conducted at the Agronomic Research Area, Faculty of Agriculture, Gomal University, Dera Ismail Khan, Khyber Pakhtunkhwa (KPK) during the year 2015-2016. The experiment was laid out in a randomized complete block design (RCBD) with split-plot arrangements having three replications. The main plot was comprised application time of herbicides while the use of herbicides was assigned to sub-plots. The data revealed that most of the weed parameters, physiological traits and agronomic attributes of crop plants were significantly affected by weed management practices including the use of herbicides at different time intervals over the weedy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weeds; Herbicides; Practices; Control.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100209

Allelopathic effect of Carthamus tinctorius on weeds and crops
Provedor de dados: 87
Autores: Motamedi,Marzieh; Karimmojeni,Hassan; G. Sini,Fatemeh.
Abstract  Background: Allelopathic plants like safflower (Carthamus tinctorius) can be considered as natural herbicides for weeds management in field. But there is not enough research on safflower genotypes allelopathy potential.  Objective:  So in this study, allelopathic effect of the four safflower genotypes on weeds (Amaranthussp., Hordeum spontaneum), crops (Sesamum indicum, Triticum aestivum) and on autotoxicity of Carthamus tinctorius was evaluated in bioassay using sandwich method. The results can be used in the management of weeds in safflower fields and also in the rotation with other crops.  Methods: Two genotypes with high allelopathic potential and two genotypes with low allelopathic potential were selected from forty genotypes of safflower....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelopathy; Sandwich method; Safflower; Weeds.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100316

WEED COMMUNITY INTERFERENCE AND PHYTOSOCIOLOGICAL STUDIES IN A SWEET SORGHUM CROP
Provedor de dados: 87
Autores: GIANCOTTI,P.R.F.; MORO,M.S.; NEPOMUCENO,M.P.; MARTINS,P.F.R.B.; BARROSO,A.A.M.; ALVES,P.L.C.A.
ABSTRACT This research was carried out to evaluate the interference periods and phytosociological indexes of the weed community on sweet sorghum, hybrid CVSW 80007, cultivated for two seasons in a year. The treatments were based on an increased duration of weed presence and weed absence after sowing (0, 4, 7, 14, 21, 28, 35, 42, 56 and 68 days after crop emergence for the summer season and 0, 4, 7, 14, 21, 28, 35, 42, 49, 56, 63 and 100 days for the fall season). The weed community was evaluated based on the number of weeds and the dry mass of each weed population in each period of weed control in the summer season and each period of no weed control and weed control in the autumn season. These data were used to determine the relative indexes of density,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sorghum bicolor; Weeds; Weed competition.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100249

Selection of Grids for Weed Mapping
Provedor de dados: 87
Autores: Camicia,R.F.M.; Maggi,M.F.; Souza,E.G.; Jadoski,S.O.; Camicia,R.G.M.; Menechini,W.
This study aimed to assess the degree of similarity presented by thematic maps generated by different sampling grids of weed plants in a commercial agricultural area of 7.95 hectares. Monocotyledons and dicotyledons were counted on the 2012/2013 and 2013/2014 harvests, before soybean planting, in the fallow period after wheat harvest, in both years. A regular grid of 10 x 10 m was produced to sample the invasive plants, used as reference, and the counting was done in 1 m² of each sample point, totaling 795 samples in each year, compared to regular grids of 30 and 50 m, generated from the data exclusion of the standard grid. Twenty-two composite soil samples were taken at a depth of 0-20 cm to correlate soil properties with weeds occurrence. For the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Precision agriculture; Sample grids; Weeds.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000200365

Soil seed bank of plant species as a function of long-term soil management and sampled depth
Provedor de dados: 87
Autores: Concenço,G; Salton,J.C; Brevilieri,R.C; Mendes,P.B; Secretti,M.L.
This study aimed at assessing the level of weed infestation indifferent areas that were submitted to different soil management for 16 years. Four management systems were studied: (1) agriculture only under conventional tillage system; (2) agriculture only under no-till system; (3) crop-livestock integrationcrop-livestock integration; (4) livestock only. These areas were sampled at three soil depths (0-5, 5-10 and 10-15 cm), and soil was stored in plastic pots and taken to a greenhouse, where soil moisture and weight were standardized. Soil was kept near 70% moisture field capacity, being revolved every 20 days when all seedling emerged from soil were counted, identified and collected for dry mass assessment. The soil coverage by weeds, number of weed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weeds; Cropping systems; Crop-livestock integration.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000400002

Physiological Performance of Seeds and Level of Herbicide Residues Depending on Application of 2.4-D in Wheat
Provedor de dados: 87
Autores: AISENBERG,G.R.; WESTENDORFF,N.R.; LANGARO,A.C.; VARGAS,L.; AGOSTINETTO,D.
ABSTRACT: Horseweed control through application of 2.4-D in the winter season is an alternative to manage biotypes resistant to herbicides that belong to other mechanisms of action. The objectives of this study were to assess the physiological quality of wheat seeds and determine the rate of 2.4-D residue, as function of application stages and herbicide rates. The treatments were arranged in factorial scheme, with three application stages (flowering, soft dough and hard dough), and four 2.4-D rates (0; 504; 1,008 and 2,015 g a.i. ha-1). The application of 2.4-D in the wheat crop changed physiological seed quality by increased the rate and total percentage of germination. The application of 2.4-D resulted in herbicide accumulation in seeds, especially when...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Weeds; Germination; Dry matter.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100205

Crop Growth and Yield Losses in Wheat Due to Little Seed Canary Grass Infestation Differ with Weed Densities and Changes in Environment
Provedor de dados: 87
Autores: HUSSAIN,S.; KHALIQ,A.; BAJWA,A.A.; MATLOOB,A.; AREEB,A.; ASHRAF,U.; HAFEEZ,A.; IMRAN,M.
ABSTRACT: Understanding the weed interference with different sowing times of crop is inevitable for forecasting yield losses by weed infestation and designing sustainable weed management systems. A field experiment was carried out to evaluate the effects of sowing dates (20th November, 10th December) and various little seed canary grass (LCG) infestation levels (10, 20, 30 and 40 plant m-2) on growth and yield of wheat under semiarid conditions. Plots with two natural infestations of weeds including LCG (Unweeded control; UWC) and excluding LCG (UWC-LCG) were maintained for comparing its interference in pure stands with designated densities. A season-long weed-free (WFC) treatment was also run. All the weeds/LCG infestation levels starting from 10 LCG...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interference; Little seed canary grass; Sowing time; Weeds; Wheat yield losses.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100272

Phytosociology in agricultural areas submitted to distinct wintercropping management
Provedor de dados: 87
Autores: Concenço,G.; Ceccon,G.; Sereia,R.C.; Correia,I.V.T.; Galon,L.
Studies related to weed dynamics are essential for agricultural sustainability in tropical soils, as their interference can cause significant yield losses, especially in crops with lower competitive ability. This study aimed to assess the composition of weed communities in the third cropping season in areas submitted to distinct wintercroppings for two consecutive years. Evaluations were made in terms of species composition, level of infestation, and severity of occurrence of each weed species in relation to the others within the same area. The wintercropping management systems were: (1) Brachiaria ruziziensis; (2) corn intercropped with B. ruziziensis; (3) corn and (4) cowpea. Plant communities under these wintercrop systems were evaluated in the third...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weeds; Population dynamics; Allelopathy; Crop rotation; Light quality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000200008

New Records of Microfungi and Chromista from Anatolian Peninsula of Turkey
Provedor de dados: 87
Autores: OZASLAN,C.; HÜSEYIN,E.; FAROOQ,S.; ONEN,H.
ABSTRACT: This article presents new records of fungi and downy mildews in Turkey on different weeds of agrophytocoenosis. These records include Plectosphaerella alismatis (Oudem.) A.J.L. Phillips, Carlucci &amp; M.L. Raimondo (on Alisma plantago-aquatica L.), Pyricularia grisea Sacc. (on Setaria viridis (L.) P. Beauv.), Phakopsora artemisiae Hirats. (on Artemisia dracunculus L.), Puccinia rubefaciens Johanson (on Galium sp.), Ustilago trichophora (Link) Kunze (on Echinochloa crus-galli (L.) P. Beauv.), Peronospora astragalina Syd. (on Astragalus homosus L.) and P. myagri Mayor (on Myagrum perfoliatum L.). Plectosphaerella and Phakopsora as generic level and others as species are new records from Turkey. Description and illustrations of the identified fungi...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ascomycota; Basidiomycota; Oomycota; Taxonomy; Weeds; Turkey.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100332

PHYTOSOCIOLOGICAL SURVEY OF WEEDS IN ERECT PROSTRATE COWPEA CULTIVARS
Provedor de dados: 87
Autores: BATISTA,P.S.C.; OLIVEIRA,V.S.; SOUZA,V.B.; CARVALHO,A.J.; ASPIAZÚ,I.
ABSTRACT The goal of this study is to characterize the weed phytosociology in some major erect and prostrate cowpea cultivars in Brazil, in the Northern growing conditions of Minas Gerais state. The test was conducted in Janaúba, Minas Gerais state. The treatments consisted in five erect cultivars (BRS Guariba, BRS Tumucumaque, BRS Novaera, BRS Itaim and BRS Cauamé) and four prostrate ones (BRS Marataoã, BRS Pajeú, BRS Pujante and BRS Xiquexique). The plots were composed of four five meter rows, spaced 0.5 m apart, for erect cultivars and 1.0 m for the prostrated ones. Weed sampling was performed 50 days after sowing by standard Square Method. The species were identified and quantified, and then dried at 65 oC for 72 hours and weighed. The frequency,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vigna unguiculata; Phytosociological; Plant habit; Weeds.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100235

Interference Periods of Raphanus raphanistrum L. in Sunflower Crop
Provedor de dados: 87
Autores: AGOSTINETTO,D.; WESTENDORFF,N.; ZANDONÁ,R.R.; ULGUIM,A.R.; LANGARO,A.C.
ABSTRACT: Raphanus raphanistrum L. (wild radish) stands out among the weeds that cause greatest damage to the sunflower crop, due to the development cycle and adaptability. The objective of this research was to determine interference periods of sunflower interacting with wild radish, and the effects of competition on yield and its components. The experiment was conducted in the field in a randomized block design with four replications. The treatments were arranged in a factorial design with factor A composed of wild radish coexistence or control in sunflower, and factor B, for eight periods (0, 7, 14, 21, 28, 35, 42 and 135 days after crop emergence). It was evaluated height, diameter of chapters, achene yield and dry matter of weeds and crop. The presence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annuus; Competition; Weeds.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100240

Redroot pigweed interference with lettuce crop
Provedor de dados: 87
Autores: Casadei,Eloisa; L. Bacha,Allan; S. Rodrigues,Juliana; S. Santos,Renata T.; L.C.A. Alves,Pedro; B.C. Filho,Arthur.
Abstract  Background:  Lettuce-production areas in Brazil are frequently infested by pigweed plants, which can interfere with production by competing for resources or releasing allelopathic compounds in the environment.  Objective:  The present study evaluated the effect of redroot pigweed (Amaranthus retroflexus) density and distribution on lettuce crop (Lactuca sativa L.).  Methods:  The cultivars Lídia, Verônica, Lucy Brown and Salad Bowl were used. After transplanting, these plants coexisted until harvest with four pigweed plants (equivalent to 16 plants m-2) located within or outside planting rows, or with one pigweed plant located at the center of the plot (4 plants m-2), as well as a control without weed. The experiment was conducted in an open and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa L.; Amaranthus retroflexus; Competition; Weeds; Density; Distribution.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100308

Occurrence of weeds in Cassava savanna plantations in Roraima
Provedor de dados: 87
Autores: Albuquerque,J.A.A.; Evangelista,M.O.; Mates,A.P.K.; Alves,J.M.A.; Oliveira,N.T.; Sediyama,T.; Silva,A.A.
A phyto-sociological survey is the first step to implement integrated weed management in crops. In this study, weed occurrence was evaluated in cassava plantations in the savannah of Roraima in northern Brazil. Harvest was performed randomly 80 times in 10 crops over four seasons (January, February, March, and April 2012). The harvested plants were cut at ground level, sorted out per species, identified, quantified, and weighed on a 0.01 g precision scale. A descriptive analysis was conducted of the phyto-sociological parameters (frequency, density, abundance, total number of individuals per species, relative frequency, relative density, relative abundance and importance value index) for the collected species. A description was also made of the botanical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta Crantz; Weeds; Phytosocial study; Savannah; Morphological characteristics.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000100010

Physiological and Genetic Bases of the Circadian Clock in Plants and Their Relationship with Herbicides Efficacy
Provedor de dados: 87
Autores: DALAZEN,G.; MEROTTO JR.,A.
In order to adapt to daily environmental changes, especially in relation to light availability, many organisms, such as plants, developed a vital mechanism that controls time-dependent biological events: the circadian clock. The circadian clock is responsible for predicting the changes that occur in the period of approximately 24 hours, preparing the plants for the following phases of the cycle. Some of these adaptations can influence the response of weeds to the herbicide application. Thus, the objectives of this review are to describe the physiological and genetic mechanisms of the circadian clock in plants, as well as to demonstrate the relationship of this phenomenon with the effectiveness of herbicides for weed control. Relationships are described...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Time of herbicide application; Weeds; Photoreceptors; Phytochromes.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000100191

HAIRY FLEABANE AS A SOURCE OF MAJOR INSECT PESTS OF SOYBEAN
Provedor de dados: 87
Autores: DALAZEN,G.; CURIOLETTI,L.E.; CAGLIARI,D.; STACKE,R.F.; GUEDES,J.V.C.
ABSTRACT Weeds compete with crops for essential inputs, but they are also important hosts for pests, both during the crop and between crops. Hairy fleabane (Conyza bonariensis) is an important weed growing in both summer and winter crops. The aim of this study was to evaluate the occurrence and population fluctuations of soybean pests using hairy fleabane as an alternative host. Samples of hairy fleabane plants were collected fortnightly over twelve months at two sites (Boa Vista do Incra and São Vicente do Sul) in Rio Grande do Sul state, Brazil. The results showed that hairy fleabane plants provided shelter to important soybean pests, including the pentatomid stink bugs Edessa meditabunda, Piezodorus guildinii, Dichelop sp. and Euschistus heros,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soybean pests; Integrated pest management; Weeds; Conyza bonariensis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000300403

Phytotoxic Potential of the Crude Extract and Leaf Fractions of Machaerium hirtum on the Initial Growth of Euphorbia heterophylla And Ipomoea grandifolia
Provedor de dados: 87
Autores: XIMENEZ,G.R.; SANTIN,S.M.O.; IGNOATO,M.C.; SOUZA,L.A.; PASTORINI,L.H.
ABSTRACT: Allelopathy is the term used to define any process involving secondary metabolites produced by plants and microorganisms that influence growth and development of agrobiological systems. Currently, it is sought to find allelochemicals of interest and know how to apply them in bio-herbicides to combat weeds. In this study, the effects of the crude leaf extract and fractions of Machaerium hirtum (Vell.) Stellfeld were analyzed on Euphorbia heterophylla L. (wild poinsettia) and Ipomoea grandifolia (Dammer) O’Donell (morning glory), as well as the occurrence of morphoanatomical changes. For this, 0.04 g of the crude extract and fractions were solubilized and diluted (50 mL) to concentrations of 0.1, 0.2, 0.4, and 0.8 g L-1 (m/v). Initial growth tests...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inhibition; Allelopathy; Morphoanatomy; Weeds.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100215

Differential suppression of rice weeds by allelopathic plant aqueous extracts
Provedor de dados: 87
Autores: Khaliq,A; Matloob,A; Khan,M.B; Tanveer,A.
Herbicidal potential of different plant aqueous extracts was evaluated against early seedling growth of rice weeds in pot studies. Plant aqueous extracts of sorghum (Sorghum bicolor), sunflower (Helianthus annuus), brassica (Brassica compestris), mulberry (Morris alba), eucalyptus (Eucalyptus camaldunensis), and winter cherry (Withania somnifera) at a spray volume of 18 L ha-1 each at the 2-4 leaf stage of rice weeds viz horse purslane (Trianthema portulacastrum) [broad-leaf], jungle rice (Echinochloa colona), and E. crus-galli (barnyard grass) [grasses] and purple nut sedge (Cyperus rotundus) and rice flat sedge (C. iria) [sedges]. The results showed significant interactive effects between plant aqueous extracts and the tested weed species for seedling...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelopathy; Aqueous extracts; Seedling growth; Weeds; Inhibition.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000100003

Physiological Variables in Pineapples Submitted to the Application of Diuron
Provedor de dados: 87
Autores: CARVALHO,A.R.J.; MAIA,V.M.; ASPIAZÚ,I.; PEGORARO,R.F.; OLIVEIRA,F.S.
ABSTRACT Diuron is a widely used herbicide on pineapple cultivations. However, its application is recommended only for the implementation of the crop. The objective of this work was to evaluate the gas exchanges of four pineapple cultivars submitted to the application of the herbicide diuron at their reproductive stage. The experiment was conducted with the IAC Fantástico, Vitória, MD2 and Pérola pineapple cultivars using the active ingredient diuron at a dose of 7.5 mL L-1. Measurements of CO2 assimilation rate, stomatal conductance, transpiration, vapor pressure deficit and water use efficiency were carried out weekly, by the hour, on two plants per cultivar, over a 24 hour period. These determinations were carried out two days before the application of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ananas comosus var. comosus; Herbicide; Gas exchange; Weeds; Chemical control.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100316

Intercropping Between Corn and Urochloa brizantha Managed with Mesotrione Underdoses
Provedor de dados: 87
Autores: MARTINS,D.A.; JAKELAITIS,A.; PEREIRA,L.S.; MOURA,L.M.F.; GUIMARÃES,K.C.
ABSTRACT: Corn and forage intercropping system has been commonly used for pasture establishment or renewal. In addition, the use of reduced doses of herbicides selective to corn has facilitated coexistence by reducing competitiveness against forage species. This study aimed to evaluate the effects of mesotrione underdoses in a corn and Urochloa brizantha intercropping on weed population dynamics, corn yield, and forage performance and nutritional quality. For this purpose, five mesotrione doses were tested (0.0, 9.6, 19.2, 38.4, and 57.6 g ha-1) in corn and forage intercropping and monocultures. Individual density and weed dry matter were influenced by mesotrione doses, intercropping, and precipitation distribution over the evaluated period in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Competition; Herbicide; Crop-livestock integration; Weeds.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100255

Antibacterial and Antioxidant Activities of Slender Amaranth Weed
Provedor de dados: 87
Autores: AKBAR,M.; SHERAZI,I.N.; IQBAL,M.S.; KHALIL,T.; WAQAS,H.M.
ABSTRACT: In the present study, antibacterial and antioxidant [1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity] activities of a weed, slender amaranth (Amaranthus viridis L.) were investigated. Extracts of different plant parts were prepared in n-hexane, chloroform and ethyl acetate. Antibacterial activity was measured by using 100 mg mL-1 concentration extracts against 4 deadly phytopathogenic bacterial species viz. Pseudomonas syringae Van Hall, Ralstonia solanacearum Smith, Erwinia carotovora (Jones), Holland and Xanthomonas axonopodis Hasse. In antioxidants assays, 10, 20 and 30 mg mL-1 extracts were used keeping DPPH as control. In these bioassays, ethyl acetate fraction of A. viridis leaf exhibited the best antibacterial and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amaranthus viridis; Bioactive components; DPPH; Phytopathogens; Weeds.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100206

Herbicidal activity of kidney leaf mud plantain leaves extracts on the germination of four species
Provedor de dados: 87
Autores: T. Perboni,Laís; Agostinetto,Dirceu; Gazola,Juliano; Tessaro,Daniela; M. Teixeira,Marlon; Neutzling,Alessandro.
Abstract  Background:  Plants synthesize compounds of specialized metabolism to defend themselves against biotic and abiotic stresses. These compounds could be used as models for pesticide development. Among the species that have not yet been studied for the potential to produce active compounds is the kidney leaf mud plantain (Heteranthera reniformis).  Objective:  The goal was to evaluate the effect of hexanic, ethyl acetate and methanolic extracts of H. reniformis leaves on cress (Lepidium sativum) seed germination to determine which one have the highest biological activity; and to evaluate different concentrations of extract with the highest biological activity on lettuce (Lactuca sativa), barnyard grass (Echinochloasp.) and giant arrowhead (Sagittaria...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heteranthera reniformis; Extracts; Weeds; Suppression.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100311

Adoption of Best Management Practices to Control Weed Resistance By Cotton, Corn, and Soybean Growers
Provedor de dados: 31
Autores: Frisvold,   George B.; Hurley,   Terrance M.; Mitchell,   Paul D.
This study examined adoption of ten best management practices (BMPs) to control weed resistance to herbicides. Using data from a survey of 1,205 U.S. cotton, corn, and soybean growers, count data models were estimated to explain the total number of practices frequently adopted. Ordered probit regressions were used to explain the frequency of individual BMP adoption. Growers practicing a greater number of BMPs frequently (a) had more education, but less farming experience; (b) grew cotton, (c) expected higher yields relative to the county average; and (d) farmed in counties with a lower coefficient of variation (CV) for yield of their primary crop. Yield expectations and variability were significant predictors of the frequency of adoption of individual...
Tipo: Conference Paper or Presentation
Palavras-chave: Weeds; Herbicide; Resistance management; Corn; Cotton; Soybeans; Adoption; Crop Production/Industries; Farm Management; Production Economics; Research and Development/Tech Change/Emerging Technologies; Q12; Q16.
Ano: 2009
URL: http://purl.umn.edu/49432

A bioeconomic model for determining the optimal response to a new weed incursion in Australian cropping systems
Provedor de dados: 31
Autores: Jayasuriya,   Rohan T.; Jones,   Randall E.
Invasions by non-indigenous plant species pose serious economic threats to Australian agricultural industries. When an invasion is discovered a decision has to be made as to whether to attempt to eradicate it, contain it or do nothing. These decisions should be based on long term benefits and costs. This paper describes a bioeconomic simulation framework with a mathematical model representing weed spread linked to a dynamic programming model to provide a means of determining the economically optimal weed management strategies over time. The modelling framework is used to evaluate case study invasive weed control problems in the Australian grains industry.
Tipo: Conference Paper or Presentation
Palavras-chave: Weeds; Incursion; Bioeconomic model; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6015

The economic cost of weeds in dryland cotton production systems of Australia
Provedor de dados: 31
Autores: Hoque,   Ziaul; Farquharson,   Robert J.; Taylor,   Ian; Walker,   Steve; Osten,   Vikki; Jones,   Randall E.
Economic losses and costs associated with weeds in dryland cotton production are important, both for growers and for industry bodies when making decisions about research priorities and research and development funding. A survey was conducted to provide information on weed types, control strategies and estimated costs to growers. We used information from the survey to estimate conventional financial losses due to weeds, and as a basis for evaluating aggregate economic (society) impacts. An economic surplus model was used to estimate the aggregate societal impact of weeds for three production regions in north-eastern Australia. The annual economic costs associated with weeds were estimated to be $41 million, and the on-farm financial costs were $25 million....
Tipo: Conference Paper or Presentation
Palavras-chave: Weeds; Dryland Cotton; And Economics; Crop Production/Industries; Environmental Economics and Policy.
Ano: 2003
URL: http://purl.umn.edu/57893

Potential Markets for Herbicide Resistant Maize Seed for Striga Control in Africa
Provedor de dados: 31
Autores: De Groote,   Hugo; Wangare,   Lucy; Kanampiu,   Fred; Odendo,   Martins; Friesen,   Dennis.
Striga is an obligate parasitic weed attacking cereal crops in Subsaharan Africa. In Western Kenya, it is identified by farmers as their major pest problem in maize. A new technology, consisting of seed coating of herbicide tolerant maize varieties, has prove to be very effective in farmer fields. To bring this technology to the farmer, a sustainable delivery system needs to be developed, preferably through the private sector. To help of the seed companies develop a strategy, the potential market for this technology is hereby calculated, combines different data sources into a Geographic Information System (GIS). Superimposing secondary data, field surveys, agricultural statistics and farmer surveys makes it possible to clearly identify the Striga-prone...
Tipo: Conference Paper or Presentation
Palavras-chave: Maize; Striga; Africa; Weeds; Pest control; Crop Production/Industries; Q12.
Ano: 2005
URL: http://purl.umn.edu/24690

Eradication of Exotic Weeds in Australia: Comparing Effort and Expenditure
Provedor de dados: 31
Autores: Hester,   Susan M.; Odom,   Doreen I.S.; Cacho,   Oscar J.; Sinden,   Jack A.
Weeds have many adverse impacts on agriculture and the environment and therefore are often targets of eradication attempts.  Eradication attempts involve large commitments of labour and financial resources over significant periods of time.  Using data from 12 Australian weed eradication attempts the authors compare work hours and expenditure on each attempt for various initial-infestation sizes.  Analysis of a limited data set shows: (1) that while the eradication effort increases with the initial area of infestation, the effort applied per hectare actually decreases; (2) that application of a greater work effort was not the reason why completed eradications were successful; and (3) that the larger the initial infestation size, the smaller the amount of...
Tipo: Working or Discussion Paper
Palavras-chave: Weeds; Eradication; Work effort; Expenditure; Infestation size; Environmental Economics and Policy; Resource /Energy Economics and Policy.
Ano: 2004
URL: http://purl.umn.edu/12921

ECONOMIC IMPACTS OF NOXIOUS WEEDS, OTHER WEEDS, AND TREE GROWTH, ON AGRICULTURAL PRODUCTION IN THE NEW ENGLAND TABLELANDS, NEW SOUTH WALES
Provedor de dados: 31
Autores: Townsend,   J.; Sinden,   Jack A.
The economic impact of weeds on farms in the New England Region of New South Wales is estimated from data from a cross -sectional survey.  Weeds can be classed as noxious or declared plants, plants that the farmers perceived as weeds, and trees -- which many farmers also perceived as weeds.  Variables were defined for several levels of intensity of infestation for each of these three classes of weeds.  The impact of each these variables, on property income and stocking, was estimated through Cobb-Douglas production functions.  The presence of very-heavy infestations of non-noxious weeds, and heavy infestations of non-noxious weeds, were found to be associated with reductions in income.  In total, the income of the representative property would be increased...
Tipo: Working or Discussion Paper
Palavras-chave: Weeds; Trees; Income; Stocking; Farm Management.
Ano: 1999
URL: http://purl.umn.edu/12918

Modelling the Dynamics of Weed Management Technologies
Provedor de dados: 31
Autores: Jones,   Randall E.; Cacho,   Oscar J.; Sinden,   Jack A.
An appropriate economic framework for valuing the benefits of weed management technologies is to treat weeds as a renewable resource stock problem. Consequently, the weed seed bank is defined as a renewable resource that changes through time due to management and seasonal conditions. The goal of decision-makers is to manage this (negative) resource so as to maximise returns over some pre-specified period of time. A modelling framework is presented for evaluating the biological and economic effects of weed management. The framework includes population dynamics, water balance, crop growth, pasture growth and crop/pasture rotation models for measuring the physical interactions between weeds and the environment. These models link in with numerical optimal...
Tipo: Conference Paper or Presentation
Palavras-chave: Weeds; Modelling; Dynamic analysis.; Land Economics/Use.
Ano: 2003
URL: http://purl.umn.edu/57902

Soil Properties and Plant Biomass Production in Natural Rangeland Management Systems
Provedor de dados: 90
Autores: Werner,Romeu de Souza; Barbosa,Fabrício Tondello; Bertol,Ildegardis; Wolshick,Neuro Hilton; Santos,Kristiana Fiorentin dos; Mota,Josie Moraes.
ABSTRACT Improper management of rangelands can cause land degradation and reduce the economic efficiency of livestock activity. The aim of this study was to evaluate soil properties and quantify plant biomass production in four natural rangeland management systems in the Santa Catarina Plateau (Planalto Catarinense) of Brazil. The treatments, which included mowed natural rangeland (NR), burned natural rangeland (BR), natural rangeland improved through the introduction of plant species after harrowing (IH), and natural rangeland improved through the introduction of plant species after chisel plowing (IC), were evaluated in a Nitossolo Bruno (Nitisol). In the improved treatments, soil acidity was corrected, phosphate fertilizer was applied, and intercropped...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Natural rangeland improvement; Forage production; Weeds.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100541

No-tillage curly lettuce cultivated under different spacings
Provedor de dados: 91
Autores: Cecconello,Antonio M.; Trogello,Emerson; Ferro,Jolcemar; Rossato,Otavio B.
ABSTRACT The use of appropriate cultural practices is important for the sustainability of the production system. This study aims to evaluate the agronomic performance of lettuce cultivar ‘Mônica’, during two crop cycles, at the Instituto Federal Catarinense, Campus of Concórdia, SC, Brazil. Two experiments were conducted in the field, arranged in randomized block design, in a 3 x 2 factorial scheme, evaluating the effects of three spacings (0.20 × 0.20, 0.25 × 0.25 and 0.30 × 0.30 m), associated with two planting systems (conventional and no-tillage with millet), with four repetitions in the first cycle and five in the second. At 39 and 44 days after transplanting, six plants were harvested in the first and in the second cycles, respectively. Soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa L.; Millet; Weeds; Yield.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000400231

Growth, production and quality of pineapple in response to herbicide use
Provedor de dados: 94
Autores: Maia,Leonardo Carvalho Brant; Maia,Victor Martins; Lima,Mário Henrique Melo e; Aspiazú,Ignacio; Pegoraro,Rodinei Facco.
In pineapple fields, weed competition is exacerbated by the fact that the crop is small and has a very slow vegetative development. The objective of this study was to determine the effects of herbicides on growth, yield and quality of pineapple, cultivar 'Pérola'. The experimental design was in randomized blocks with four treatments and four replications. Treatments consisted of weeding by hoe and the herbicides diuron; fluazifop-p-butyl and atrazine + S-metolachlor applied in post-emergence. The characteristics evaluated monthly during the vegetative stage were stem diameter, D-leaf length, number of leaves, number of emitted leaves and percentage of natural floral induction. In the reproductive phase, evaluations were made of average fruit weight (g)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ananas comosus var. comosus; Weeds; Herbicides; 'Pérola'.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452012000300020

New additions to the introduced flora of the Juan Fernández Islands: origin, distribution, life history traits, and potential of invasion
Provedor de dados: 97
Autores: CUEVAS,JAIME G.; MARTICORENA,ALICIA; CAVIERES,LOHENGRIN A.
Oceanic islands, such as Juan Fernández in Chile, are the home for particular biotas that have evolved in isolation over a long period. The anthropogenic introduction of allochtonous plants is one of many problems for the conservation of endemic elements. In this paper, we present the new additions to the introduced flora of the Juan Fernández Islands, adding some comments about their life form, origin, morphological characteristics, ecology, distribution, abundance, and their potential of invasion. We cited 27 new species, 12 new genera, and three new families for the Juan Fernández flora (Amaryllidaceae, Commelinaceae and Violaceae). Most genera belonged to Asteraceae (seven species). Fifty-nine percent of taxa were perennial herbs, followed by annual or...
Tipo: Journal article
Palavras-chave: Biological invasions; Garden plants; Oceanic islands; Plant introductions; Weeds.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000300011

Correlation between 2,4-D herbicide residues and soil attributes in southern of Brazil
Provedor de dados: 124
Autores: Baumgartner,Denilson; Souza,Eduardo Godoy de; Coelho,Silvia Renata Machado; Maggi,Marcio Furlan.
ABSTRACT The 2,4-D herbicide is widely used in Brazilian and global agriculture to control weeds. It is potentially toxic to mankind, and one of the herbicides final destinations is the soil. The aim of the study was to determine the spatial correlation of 2,4-D herbicide in soil attributes after 12 months of application. The experiment was conducted in an agricultural area of 5.04 ha in the municipality of Nova Santa Rosa/PR, in 2011 and 2012. Two soil samples collections were performed: collection 1 (09/03/2011) and collection 2 (08/25/2012), both of which were made 12 months after 2,4-D application. The herbicide was applied in a single dose of 1.5 L ha-1 in 09/2010 and in two doses in 09/2011 (1.0 L ha-1or 1.5 L ha-1 2,4-D). The correlation between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agrochemicals; Weeds; Spatial distribution.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000300428

Profitability of new maize technology in Thailand :  An economic analysis of three years verification trials
Provedor de dados: 106
Autores: Harrington, L.W.; Rachain Thiraporn; Sarun Wattanutchariya.
19 tables
Palavras-chave: Corn; Maize; Economic analysis; Verification trial; Production technology; Fertilizer; Weeds; Hybrids; ข้าวโพด; เทคโนโลยีการผลิต; การวิเคราะห์ทางเศรษฐศาสตร์; ปุ๋ย; วัชพืช; ลูกผสม.
Ano: 1985
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4609

การใช้สารกำจัดวัชพืชแบบหลังงอกในข้าวโพดข้าวเหนียว
Provedor de dados: 106
Autores: Sodsai Changsaluk; Rungsit Suwanketnikom; Somchai Lim-aroon.
6 tables
Palavras-chave: Corn; Maize; Waxy corn; Weeds; Herbicides; Post-emergence herbicides; ข้าวโพด; ข้าวโพดข้าวเหนียว; การกำจัดวัชพืช; สารกำจัดวัชพืชแบบหลังงอก.
Ano: 2004
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4228

การแข่งขันของหญ้ายางที่มีต่อข้าวฟ่าง
Provedor de dados: 106
1 table
Palavras-chave: Sorghum; Weeds; Wild poinsettia; ข้าวฟ่าง; วัชพืช; หญ้ายาง.
Ano: 1986
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4396

Some Economic considerations regarding the use of atrazine herbicide on maize in Thailand
Provedor de dados: 106
Autores: Montgomery, Roger; Sanit Kao-ian; Chamnien Boonma.
8 tables
Palavras-chave: Corn; Maize; Weeds; Atrazine; Herbicides; Weed control; Economic analysis; Yields; ข้าวโพด; วัชพืช; อาทราซีน; สารกำจัดวัชพืช; การวิเคราะห์ทางด้านเศรษฐกิจ; การผลิต.
Ano: 1981
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4079

การใช้สารกำจัดวัชพืชแบบก่อนงอกในข้าวโพดข้าวเหนียวพันธุ์รัชตะ 1
Provedor de dados: 106
Autores: Sodsai Changsaluk; Rungsit Suwanketnikom.
6 tables
Palavras-chave: Corn; Maize; Waxy corn; Ratchata 1; Pre-emergence herbicide; Weeds; ข้าวโพด; ข้าวโพดข้าวเหนียว; สารกำจัดวัชพืชแบบก่อนงอก; การกำจัดวัชพืช.
Ano: 2003
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4551

งานวิจัยการผลิตข้าวโพดประจำปี 1984
Provedor de dados: 106
Autores: Supot Faungfupong; Pipat Weerathaworn; Somchai Piyapantavanon; Kunya Chaupun; Punnipa Phrachya; Porn Rungchang.
4 tables
Palavras-chave: Corn; Maize; Production; Seed bed preparation; Fertilizers; Weeds; Aflatoxins; Water stress; ข้าวโพด; การผลิต; การเตรียมดิน; ปุ๋ย; วัชพืช; การขาดน้ำ; อะฟลาทอกซิน.
Ano: 1984
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4466

ผลของวิธีการเกษตรกรรมแบบต่าง ๆ ที่มีต่อผลผลิตของข้าวฟ่างลูกผสมและข้าวฟ่างพันธุ์แนะนำ
Provedor de dados: 106
2 ill., 2 tables
Palavras-chave: Sorghum; Pure line; Hybrids; Cultural practices; Row spacing; Fertilizers; Weeds; Broadcast planting; Row planting; ข้าวฟ่าง; วิธีการปลูก; ปุ๋ย; ลูกผสม; พันธุ์แนะนำ.
Ano: 1984
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4472

Effect of atrazine on controlling Euphorbia geniculata in corn
Provedor de dados: 106
Autores: Somchart Kanjanajirawong; Jaran Pratoomwong; Maneesa Teerawatsakul.
2 tables
Palavras-chave: Corn; Maize; Weeds; Milkweed; Euphorbia geniculata; Atrazine; Weed control; ข้าวโพด; วัชพืช; อาทราซีน; ยูโฟร์เบีย.
Ano: 1981
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4061

การใช้ Dimethenamid ควบคุมวัชพืชในไร่เกษตรกร
Provedor de dados: 106
Autores: Sodsai Changsaluk; Rungsit Suwanketnikom; Somchai Lim-aroon; Somchai Potisan.
5 tables
Palavras-chave: Corn; Maize; Sweet corn; Weeds; Herbicides; Dimethenamid; Outreach research; ข้าวโพด; ข้าวโพดหวาน; การควบคุมวัชพืช; สารควบคุมวัชพืช; ไดเมทธีนามิด.
Ano: 2004
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4229

Effects of preplant herbicides applied for control of purple nutsedge (Cyperus rotundus) on growth and yield of corn (Zea mays)
Provedor de dados: 106
Autores: Umporn Suwunnamek; Suthep Thongma.
10 tables
Palavras-chave: Corn; Maize; Weeds; Pre-plant herbicides; Yields; Growth; Purple nutsedge; Cyperus rotundus; ข้าวโพด; แห้วหมู; การเจริญเติบโต; สารกำจัดวัชพืชแบบก่อนปลูก.
Ano: 1990
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4299

Periods of interference by Cyperus esculentus L. in Pennisetum purpureum Schum
Provedor de dados: 109
Autores: Brighenti,Alexandre Magno; Oliveira,Maurílio Fernandes.
Abstract Interference from weeds directly affects the productivity and the quality of elephant grass (Pennisetum purpureum) fodder. The difficulty in controlling weed species is one of the primary limitations to the production and use of elephant grass as forage in dairy farming and for biomass production in energy generation. The objective of this study was to determine the different periods in which yellow nutsedge (Cyperus esculentus) interfered with elephant grass forage yield. Two field experiments were conducted using a randomized complete block design with four replicates in Valenga, Rio de Janeiro State, Brazil. Elephant grass and weeds were maintained together for increasing periods of time: 0, 14, 28, 42, 56 and 70 days after planting (DAP)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyperus esculentus; Elephant grass; Forage; Napier grass; Pennisetum purpureum; Yellow nutsedge; Weeds.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000400512

Temporal expression of the sor1 gene and inhibitory effects of Sorghum bicolor L. Moench on three weed species
Provedor de dados: 39
Autores: Santos,Roseane Cavalcanti dos; Ferraz,Gabriela de Morais Guerra; Albuquerque,Manoel Bandeira de; Lima,Liziane Maria de; Melo Filho,Péricles de Albuquerque; Ramos,Alessandra de Rezende.
The temporal expression of gene sor1 and the inhibitory effect of Sorghum bicolor L. Moench against weeds were studied by semiquantitative polymerase chain reaction and intercropping management, respectively. To quantify sor1 expression, seeds were sown in pots and RNA was collected from the roots at 5, 10, 15, 20 and 30 days after emergence (DAE). In the inhibition assay, cotton and three weeds were evaluated during single cropping and during intercropping with S. bicolor. The assay was completely randomized, with eight replications. We found early expression of sor1 in most S. bicolor accessions by 5 DAE, and a gradual reduction thereafter. Only one of the accessions showed sor1 expression up to 30 DAE. In the inhibition assay, the most significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelopathy; Semiquantitative PCR; Sorgoleone; Weeds.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000300008

Allelopathic effects of orange (Citrus sinensis L.) peel essential oil
Provedor de dados: 39
Autores: Ribeiro,Jose Pedro Nepomuceno; Lima,Maria Inês Salgueiro.
Crop weeds are the main problem in agriculture, causing a worldwide annual loss of about US$95 billion. The principal method for control is the use of synthetic herbicides. The continued use of these products increases crop costs, reduces crop quality, and leaves toxic residues in the environment, which are a threat to human and livestock health. Therefore, there is a demand for environmentally friendly methods of weed control. The use of allelopathic compounds from crop residues is an alternative. Orange is one of the biggest crops in the world, and its cultivation generates large amounts of residues. There is strong evidence of bioactivity in orange peel essential oil. Therefore, the objective in this work was to verify the allelopathic proprieties of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelopathy; Crop residues; Limonene; Organic agriculture; Weeds; Weed controly.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000100025

Interferência e estudo fitossociológico da comunidade infestante na cultura da beterraba transplantada - DOI: 10.4025/actasciagron.v30i3.3508
Provedor de dados: 1
Autores: Carvalho, Leonardo Bianco de; FCAV; Pitelli, Robinson Antonio; FCAV; Cecílio Filho, Arthur Bernardes; FCAV; Bianco, Silvano; FCAV; Guzzo, Caio Dória; FCAV.
O trabalho teve como objetivo o estudo fitossociológico e a determinação dos períodos críticos de interferência da comunidade infestante na cultura da beterraba transplantada. Os tratamentos consistiram em períodos semanais crescentes de convivência e de controle da comunidade infestante, a partir da segunda semana após o transplante das mudas. A comunidade infestante foi avaliada por meio do número de indivíduos e da massa seca acumulada correspondente, para cada população de planta daninha e período avaliado. A cultura foi colhida 91 dias após o transplante das mudas, quando se avaliou o diâmetro transversal e a produtividade comercial das raízes. As principais plantas daninhas encontradas foram Amaranthus viridis, Coronopus didymus, Galinsoga...
Palavras-chave: 5.01.00.00-9 Agronomia Beta vulgaris L.; Períodos críticos de interferência; Plantas daninhas 5.01.02.00-1 Fitossanidade Beta vulgaris L.; Critical interference periods; Weeds.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3508

The effects of the coexistence of weed communities on table beet yield during early crop development - doi: 10.4025/actasciagron.v32i4.4649
Provedor de dados: 1
Autores: Carvalho, Leonardo Bianco; FCAV; Guzzo, Caio Dória; Universidade Estadual Paulista "Júlio de Mesquita Filho"; Pitelli, Robinson Antonio; Universidade Estadual Paulista "Júlio de Mesquita Filho"; Cecílio Filho, Arthur Bernardes; Universidade Estadual Paulista "Júlio de Mesquita Filho"; Bianco, Silvano; Universidade Estadual Paulista "Júlio de Mesquita Filho".
The objective was to evaluate the effects of initial weedy periods on the weed community and on the productivity of direct seeded and transplanted table beet cropping systems. A field trial was conducted at São Paulo State University, Brazil, in a randomized complete block design using a 2 x 13 factorial scheme. Direct seeding and seedling transplanting methods were evaluated within thirteen increasing weekly weedy periods. Weed relative importance was calculated and weed density and weed dry matter accumulation data were analyzed by nonlinear regression as well as beet yield and stand, which were submitted to analysis of variance. Amaranthus viridis, Coronopus didymus, Cyperus rotundus, Digitaria nuda, Galinsoga parviflora and Nicandra physaloides were...
Tipo: Experimento de campo
Palavras-chave: 5.01.02.00-1 Beta vulgaris; Weeds; Interference; Direct seeding; Seedling transplanting Matocompetição Beta vulgaris; Weeds; Interference; Direct seeding; Seedling transplanting.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/4649

Preferência alimentar de adultos de Metriona elatior Klug (Coleoptera: Chrysomelidae, Cassidinae) por diferentes híbridos de Solanum melogena Linnaeus (Solanaceae) - DOI: 10.4025/actascibiolsci.v30i4.5874
Provedor de dados: 3
Autores: Al Gazi, Ariel David Freitas; UNESP/Jaboticabal; Gandolfo, Daniel; ARS/Argentina; Pitelli, Robinson Antonio; UNESP/Jaboticabal.
Metriona elatior Klug é potencial candidato para o controle biológico de Solanum viarum Dunal (joá-bravo), pois as larvas e adultos se alimentam de suas folhas e têm baixa taxa de dispersão. A especificidade é um forte requisito para a adequabilidade de um organismo como agente de controle biológico, especialmente pela estratégia inundativa. Desse modo, a preferência alimentar do adulto desse inseto em laboratório foi avaliada em 14 híbridos de Solanum melogena Linnaeus (berinjela). A criação estoque foi mantida em laboratório, com os indivíduos se alimentando de folhas do joá-bravo. O estudo foi realizado utilizando-se testes de dupla e múltipla escolha, em períodos de alimentação de 24 e 48h, oferecendo-se discos de tecido foliar, em condições de placas...
Palavras-chave: Metriona elatior; Controle biológico; Planta daninha; Preferência alimentar; Berinjela; Joá-bravo. Metriona elatior; Biological control; Weeds; Feeding preference; Eggplant; Tropical soda apple.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5874

Phytotoxic potential of Senna occidentalis and Senna obtusifolia - doi: 10.4025/actascibiolsci.v32i3.5833
Provedor de dados: 3
Autores: Peres, Marize Terezinha Lopes Pereira; UFMS; Cândido, Ana Carina da Silva; UFMS; Bonilla, Marilia Bisacotti; UFMS; Faccenda, Odival; UEMS; Hess, Sônia Corina; UFMS.
This work aimed to investigate the phytotoxic potential of the aerial and underground parts of Senna occidentalis and S. obtusifolia on the germination and initial growth of lettuce and onion. Four concentrations were used of each ethanol extract (0, 250, 500 and 1000 mg L-1), with four replications of 50 seeds. From the investigated species, the aerial part of S. occidentalis interfered in onion germination and the aerial part of S. obtusifolia interfered in the germinations of lettuce and onion. The ethanol extract from the aerial and underground parts of the studied species inhibited the root growth of lettuce and onion. The hypocotyl/coleoptile growth in lettuce and onion was inhibited by the extract of S. obtusifolia aerial part and the underground...
Palavras-chave: Ethanol extract; Leguminosae; Weeds ethanol extract; Leguminosae; Weeds.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5833

Investigation of different mechanical weeding methods performance for weed control efficiency, mechanical injuries and yield in three bean varieties
Provedor de dados: 111
Autores: Hedayatypour, Abolfazl; Goodarzi, Mustafa; Mostafavirad, Marefat.
       In many agricultural systems around the world, competition of weeds is one of the major factors reducing crop yield. This research was carried out to study the performance of mechanical methods for weed control, mechanical damage, yield and yield components of three bean genotypes in 2012 and 2013 cropping seasons. The experiment carried out as split plot arrangement based on complete block design with three replications in Agricultural and Natural Resources Research and Education Center in Markazi Province, Iran, Arak. The experimental treatments were comprised of three bean lines and varieties including Sadri, KS-21189 and COS16 as main plots and four mechanical methods of weeds control including: sweep type weeder, rotary type weeder, rolling...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agronomic traits; Bean; Weeds; Weeding performance; Weeding machines; Yield.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6067

Selection of phytotoxin producing rhizobacteria
Provedor de dados: 42
Autores: Carvalho,Daniel D.C.; Oliveira,Denilson F.; Campos,Vicente P.; Pasqual,Moacir.
In order to select phytotoxin producing rhizobacteria to control weed plants, twenty five bacterial strains previously isolated from the rhizospheres of various plants were grown in a liquid medium and, after cell removal by centrifugation, the liquid phases were freeze-dried and the products were extracted with ethyl acetate/methanol. The extracts were concentrated to dryness under vacuum and dissolved in water and sucrose solution to be submitted to in vitro assays of lettuce (Lactuca sativa L.) seed germination and wheat (Triticum aestivum L.) coleoptile growth. Although most samples affected coleoptile growth, only those from four strains reduced lettuce seed germination. Two strains of Bacillus cereus, one strain of B. pumilus and one of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacillus; Stenotrophomonas; Weeds; Lettuce; Wheat.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300027

Morphological analysis and DNA methylation in Conyza bonariensis L. cronquist (Asteraceae) phenotypes
Provedor de dados: 53
Autores: Paula,Juliana Maria de; Pinto-Maglio,Cecília Alzira Ferreira; Pinto,Luciana Rossini.
ABSTRACT The species Conyza bonariensis (L.) cause losses in agriculture due to their invasive capacity and resistance to herbicides like glyphosate. The species of this genus exhibit phenotypic plasticity, which complicates their identification and characterization. Thus, experiments were performed with 2 extreme C. bonariensis phenotypes (called broad leaf and narrow leaf) in greenhouse conditions and in the laboratory, in order to verify if the morphological differences among these phenotypes are a genetic character or result from environmental effects. In addition to the comparative morphological analysis, assessment of DNA methylation profile was performed to detect the occurrence, or not, of differences in the epigenetic level. The morphological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phenotypic plasticity; Conyza bonariensis; Resistance; Weeds.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000400480

New hosts of Myrothecium spp. in Brazil and a preliminary in vitro assay of fungicides
Provedor de dados: 58
Autores: Quezado Duval,A.M.; Henz,G.P.; Paz-Lima,M.L.; Medeiros,A.R.; Miranda,B.E.C.; Pfenning,L.H.; Reis,A.
Myrothecium roridum and M. verrucaria are two plant pathogenic species causing foliar spots in a large number of cultivated plants. This paper aims to study the causal agents of foliar spots in vegetable crops (sweet pepper, tomato and cucumber), ornamental plants (Spathiphyllum wallisii, Solidago canadensis, Anthurium andreanum, Dieffenbachia amoena) and a solanaceous weed plant (Nicandra physaloides). Most of the isolates were identified as M. roridum; only the isolate 'Myr-02' from S. canadensis was identified as M. verrucaria. All the isolates were pathogenic to their original plant hosts and also to some other plants. Some fungicides were tested in vitro against an isolate of M. roridum and the mycelial growth recorded after seven days. Fungicides...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Myrothecium roridum; M. verrucaria; Vegetable crops; Ornamentals; Weeds; Etiology.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000100034

The effect of lead on the phytochemistry of Tithonia diversifolia exposed to roadside automotive pollution or grown in pots of Pb-supplemented soil
Provedor de dados: 61
Autores: Olivares,Elizabeth.
Tithonia diversifolia, a ruderal weedy species utilized in agroforestry, is widely distributed in the tropics, often being found in wasteland, margins of polluted city rivers and roadsides. The objective of this study was to compare plants sampled at a light and heavy traffic roadside for metal concentration and foliar compounds which may be related to senescence and/or detoxification of metals. The field survey was followed by an experiment in pots of Pb-acetate-supplemented soil to verify if the same response is obtained under controlled conditions with regard to Pb. The concentration of Pb in leaves and roots of plants sampled at a heavy traffic roadside was higher than in samples from a light traffic site. The content of Cr, Al, Fe, Cu and Ni was also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asteraceae; Metals; Mexican sunflower; Phenols; Pollution; Weeds.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000300004

Allelopathic effects of aqueous and organic fractions of Euphorbia dracunculoides Lam. on germination and seedling growth of chickpea and wheat
Provedor de dados: 117
Autores: Tanveer,Asif; Kamran Jabbar,Muhammad; Kahliq,Abdul; Matloob,Amar; Nadeem Abbas,Rana; Mansoor Javaid,Muhammad.
Identification of weed species with allelopathic potential and characterization of their adverse effects against associated crops is required for better understanding of weed-crop interactions. Phytotoxic activity of Euphorbia dracunculoides Lam. on germination and seedling growth of chickpea (Cicer arietinum L.) and wheat (Triticum aestivum L.) was investigated under controlled conditions. Two separate studies were done with each of four organic solvent fractions (n-hexane, chloroform, ethylacetate, 1-butanol) and crude aqueous (1:10 and 1:20) whole plant fractions of E. dracunculoides using distilled water and 0.05% (v/v) dimethyl sulfoxide (DMSO) as control. Different aqueous and organic fractions of E. dracunculoides had a significant bearing on...
Tipo: Journal article
Palavras-chave: Allelopathy; Weeds; Germination attributes; Suppression; Phenolics.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400006

Weed Dynamics in Wheat-Canola Intercropping Systems
Provedor de dados: 117
Autores: Naeem,Muhammad; Ata Cheema,Zahid; Ahmad,Azraf-ul-Haq; Wahid,Abdul; Kamaran,Muhammad; Arif,Muhammad.
Weeds cause huge losses due to their competition with crops. Intercropping of wheat (Triticum aestivum L.) with canola (Brassica napus L.) under different spatial arrangements was evaluated for their effects on weeds and interaction between the crops at the Agronomic Research Area, University of Agriculture, Faisalabad, Pakistan, during 2009-2010. The treatments included wheat (line sowing), canola (line sowing), wheat (broadcast method), one row of wheat + one row of canola (30 cm apart), two rows of wheat + two rows of canola (45 cm apart), four rows of wheat + four rows of canola (75 cm apart) and mixed cropping of wheat + canola (broadcast method). The results revealed that all intercropping treatments significantly affected weed density and dry weight...
Tipo: Journal article
Palavras-chave: Intercropping; Brassica napus; Triticum aestivum; Weeds.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300019

Competition with spreading dayflower (Commelina diffusa L.) can affect the agronomic characteristics and mineral content of common bean grains
Provedor de dados: 118
Autores: Gomes,Lidiane dos Santos; Pin Dalvi,Leandro; Colodete Altoé,Sabrina; Rocha,Leonardo José Frinhani Noia da; Oliveira,Fabio Luiz de.
Abstract The objective of this study was to evaluate the effects of the presence of Commelina diffusa weeds on the agronomic characteristics and mineral content of bean grains (Phaseolus vulgaris L.). The experiments were conducted using a completely randomized design with five replications in a greenhouse. The treatments consisted of two bean cultivars (BRS Ametista and BRS Estilo) grown in the presence and absence of the weeds. The weeds affected the agronomic and mineral characteristics of the varieties; caused a decrease in the number of leaves; reduced the chlorophyll content in the leaves; and reduced the nitrogen, phosphorus and iron contents in the grains. Competition with spreading dayflower did not cause significant effects on the stem diameter...
Tipo: Journal article
Palavras-chave: Food security; Mineral characteristics; Phaseolus vulgaris L; Weeds.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000200121

Vegetation changes after 15 years of abandonment of crop fields in the Pampas region (Argentina)
Provedor de dados: 118
Autores: Boccanelli,Silvia; Pire,Eduardo; Lewis,Juan.
Agriculture has been practised in the Argentine Pampa region for more than a century. This long history of disturbance has strongly modified the native vegetation of the region. Some original species have disappeared or its area has been remarkably reduced. The objective was to evalúate vegetation changes over time after the abandonment of agriculture practice. Our hypothesis was that over time vegetation in this region will evolve towards a "flechillar" (Stipa spp. community) similar to the original vegetation. The experiment was conducted at Zavalla (Santa Fe) Argentina (33° 01' S, 60° 53' W and 50 m.a.s.1.). Vegetation evolution was studied during 15 years (1982-1997) after abandonment, considering four initial crop situations (i.e. wheat, soybean,...
Tipo: Journal article
Palavras-chave: Abandoned field; Agriculture; Disturbance; Secondary succession; Weeds.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000200005

The importance of weeds as melliferous flora in central Chile
Provedor de dados: 118
Autores: Grimau,Lissette; Gómez,Miguel; Figueroa,Rodrigo; Pizarro,Rodrigo; Núñez,Gabriel; Montenegro,Gloria.
The use of native flora by Apis mellifera L. in Chile has been demonstrated in many studies; however, certain species that are viewed as weeds contribute extensively to the floral composition of honey. A total of 92 honey samples from the Libertador General Bernardo O'Higgins region in Chile were analyzed to determine which weeds are most important in honey production and which are most preferred by melliferous bees. Their relative contributions to the pollen fraction of each honey sample were also determined using melissopalynological tests in accordance with Chilean regulation (NCh2981.Of2005; Ministerio de Agricultura. 2006) to evaluate the botanical origins of the honey samples. Species considered weeds were classified according to their importance in...
Tipo: Journal article
Palavras-chave: Apis mellifera L; Central Zone; Chile; Fabaceae; Weeds.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000300011