|
|
|
| Registros recuperados: 2.357 | |
|
|
| A. Matos,Ana K.; Carbonari,Caio A.; F.S. Brito,Ivana P.; L.G.C. Gomes,Giovanna; B. Trindade,Maria L.; D. Velini,Edivaldo. |
| Abstract Background: The use of commercial mix and tank mix with two or more herbicides is a widespread practice. However, despite its several possible benefits, little is known about its effect on the behavior of the molecules in the soil, which can increase or reduce the leaching potential of these molecules. Objective: This study evaluated the leaching potential of the herbicides diuron and sulfentrazone applied, using commercial mix and tank mix, in soils with different textures. Methods: The herbicides diuron (1,750 g ha-1) and sulfentrazone (875 g ha-1) were applied in three soils with different textures (clayey, medium, and sandy), using a commercial mix (Stone®) and a tank mix (Herburon 500 BR + Boral®). Subsequently, the treated soils were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide; Leaching; Commercial mix; Tank mix. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100318 |
| |
|
|
| AAMIR,M.; KHAN,E.A.; BALOCH,M.S.; ASLAM,M.. |
| ABSTRACT: Lathyrus aphaca is an aggressive dicotyledonous weed. The effect of different agroecological components/factors on the germination ecology of this weed was explored under a glasshouse and laboratory condition in 2014. The germination response of L. aphaca was lower at high temperature while maximum seed germination was found at 15/12 oC (day/night). Light significantly stimulated L. aphaca germination; nevertheless, substantial germination occurred under dark conditions. More than 86-90% of L. aphaca seeds germinated at pH level of 6.2-7.5. A significant quantity of seed germinated at 250 mM NaCl. There was no germination at -1 MPa. When the temperature was lower than 20/15 oC (day/night) initiation time of germination and germination index (GI)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Osmotic stress; Weed seeds; Salt stress; Temperature; PH; Light. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100253 |
| |
|
|
| Aarestrup,J.R.; Karam,D.; Corrêa,E.J.A.; Fernandes,G.W.. |
| A avaliação da qualidade fisiológica de sementes é um aspecto importante para o controle das plantas daninhas. Objetivou-se verificar a viabilidade de sementes de Euphorbia heterophylla resistentes e suscetíveis a herbicidas, após serem armazenadas durante 14 meses, por meio da aplicação dos testes de germinação e tetrazólio. Foi analisada a germinação na ausência e presença de luz, em temperatura constante (25 ºC). Para o teste de tetrazólio, as sementes foram seccionadas longitudinal-diagonalmente, colocadas em placas de Petri contendo solução de tetrazólio a 1%, envoltas em papel-alumínio e mantidas a 30 ºC, no escuro e em estufa, por 18 horas. Não foram observadas diferenças significativas entre os biótipos resistentes e suscetíveis de E. heterophylla... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dormência; Euphorbiaceae; Germinação; Planta daninha; Resistência; Tetrazólio. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582008000300006 |
| |
|
|
| Aarestrup,J.R.; Karam,D.; Fernandes,G.W.; Corrêa,E.J.A.. |
| O objetivo deste estudo foi verificar os efeitos do chlorimuron-ethyl, inibidor da enzima acetolactato sintase (ALS), no crescimento foliar (largura e comprimento) e em altura de plantas de Euphorbia heterophylla suscetíveis e resistentes aos herbicidas inibidores da ALS, aos 30 dias após a aplicação do herbicida. O experimento foi conduzido em casa de vegetação, utilizando-se o delineamento inteiramente casualizado, com 11 repetições por dose aplicada do herbicida. Foram observadas respostas diferenciais entre os biótipos. As características analisadas variaram segundo a dose utilizada do herbicida. Nenhuma das doses experimentais, incluindo a comercial, foi capaz de controlar, eficientemente, o desenvolvimento das plantas resistentes. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Euphorbiaceae; Herbicida; Planta daninha; Resistência; ALS. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582008000400023 |
| |
|
|
| ABBAS,A.; KHALIQ,A.; SAQIB,M.; MAJEED,M.Z.; ULLAH,S.; HAROON,M.. |
| ABSTRACT: Weeds cause considerable damage to rice crop. To ascertain the influence of different weed management practices under different tillage systems, a field experiment was conducted during 2014-15. Experimental design was RCB with split-plot arrangement and with a net plot size of 6 x 2 m. Three tillage systems viz; zero tillage with glyphosate application and conventional tillage with and without stale seed bed, and seven weed management treatments viz; weedy check, manual weeding, oxadiargyl as pre-emergence, pyrazosulfuron as pre-emergence, pyrazosulfuron as post-emergence, fenoxaprop-ethyle + sodium fluoride as post-emergence and fenoxaprop-ethyle + sodium fluoride as post-emergence. Results revealed that all treatments including tillage systems... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa L.; Direct-seeded rice; Tillage systems; Herbicides; Integrated weed management. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100280 |
| |
|
|
| ABBAS,N.; TANVEER,A.; AHMAD,T.; AMIN,M.. |
| ABSTRACT: Herbicide resistance development among weeds, environmental contamination and health concerns due to the overuse of herbicides have led researchers to focus on ways to reduce herbicides to be sprayed for weed management. Adjuvants are best suited for that purpose, as they accomplish a crucial role in achieving satisfactory control of weeds by maximizing herbicidal activity. A two-year field investigation was carried out at the Agronomic Research Area, in the University of Agriculture, in Faisalabad, Pakistan during the winter of 2014 and 2015, with the objective to optimize the activity of two broad-spectrum herbicides at reduced dose (75% of the label mentioned rate) for weed control in wheat. Minimum weed density, weed dry weight and NPK uptake... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triticum aestivum L.; Adjuvants; Grain yield; Benefit-cost ratio. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100325 |
| |
|
| |
|
| |
|
|
| ABBAS,T.; NADEEM,M.A.; TANVEER,A.; ALI,H.H.; SAFDAR,M.E.; ZOHAIB,A.; FAROOQ,N.. |
| ABSTRACT: Recent increases in the development of herbicide resistance in Phalaris minor worldwide demand alternative non-chemical strategies to control this weed. A series of experiments were conducted under laboratory and greenhouse conditions to explore the herbicidal potential of four allelopathic crops, including maize, rice, sorghum and sunflower, at different concentrations of aqueous extracts (2.5% and 5%), residues (1%, 2% and 4%) and mulches (4, 8, and 12 ton ha-1) against fenoxaprop-resistant P. minor. Aqueous extracts, residues and mulches provided 86-100%, 73-100% and 16-40% control of this resistant weed biotype, respectively. The dry biomass reduction due to aqueous extracts, residues and mulches was 48-100%, 48-100% and 20-54%, respectively.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allelopathy; Alternative weed management; Hormesis; Littleseed canarygrass; Natural herbicides. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100257 |
| |
|
| |
|
|
| ABBAS,T.; NADEEM,M.A.; TANVEER,A.; ZOHAIB,A.. |
| ABSTRACT Hormetic effects of herbicides at ultra-low doses have been proved against range of crop species, although available data of herbicides hormesis about the weeds growth is very limited. This study investigates the promotive effect of low doses of fenoxaprop-Pethyl on growth and seed production of littleseed canarygrass and wild oat. Pot experiments were conducted twice in Wire House at Agronomic Research Area, University of Agriculture, Faisalabad, during 2014-15. Seven different concentrations of fenoxaprop-P-ethyl [0, 1, 3, 6, 9, 12 and 15 g a.i. ha-1] were applied as post emergence herbicide at 3-4 leaves stage of the weeds. Results revealed that increase in growth occurred within first two weeks after spraying at fenoxaprop-P-ethyl doses 1, 3... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Avena fatua; Fenoxaprop-P-ethyl; Growth stimulation; Phalaris minor; Ultra-low doses. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000300527 |
| |
|
|
| Abdelhamid,M.T.; El-Metwally,I.M.. |
| Two field experiments were conducted at the experimental farm of the National Research Centre at Shalakan, Kalubia Governorate, Egypt, during 2006 and 2007 seasons, to study the effect of three pre-emergence herbicides, prometryn [at the rate of 0.75, 1.5 and 2.25 kg ha-1], oxadiargyl [at the rate of 240, 480 and 720 g ha-1] and butralin [at the rate of 1.20, 2.40 and 3.36 kg ha-1], two hand hoeing treatments and a nonweeded check, on weed infestation, nodulation, growth, yield and yield attributes of soybean plants. Two hand hoeing treatments resulted in the highest weed depression expressed as the lowest fresh and dry weights of broadleaved, grassy and total weeds. The reduction percentage in weed dry matter compared to the nonweeded treatment was 98.3,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Herbicides; Weed management. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582008000400017 |
| |
|
|
| ABDULLAH,Y.; BALOCH,M.S.; SHAH,A.N.; HASHIM,M.M.; NADIM,M.A.; ULLAH,G.; KHAN,A.A.; SHAHZAD,M.F.. |
| ABSTRACT: The present study was to assess the additive effects of cuscuta (akasbel) aqueous extract alone and in combination with full and reduced doses of commercially available weedicides against weeds in wheat crop during the year 2016-2017. The study was conducted in a randomized complete block design (RCBD) with 3 replications. The results showed that hand weeding and use of weedicides Allymax and Axial (full and half recommended doses) significantly controlled all prevailing weeds and increased yield and yield contributing parameters over the weedy check/control and sole application of cuscuta aqueous extract. Hand weeding and Allymax (full dose) showed minimum weed population, relative density, fresh and dry weed biomass and higher leaf area index... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Wheat; Weedicides; Management; Density. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100230 |
| |
|
|
| 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 |
| |
|
|
| ABUDUREHEMAN,B.; CHEN,Y.; LI,X.; ZHANG,L.; LIU,H.; ZHANG,D.; GUAN,K.. |
| ABSTRACT: Carex physodes is an ephemeral species in the cold desert of Gurbantunggut in Northwest China. It has both asexual and sexual reproductive patterns. The primary aims of this study were to characterize the reproduction systems and identify the role of fruit dispersal in the sexual reproduction of C. physodes. Aboveground and underground biomass, root-shoot ratio, inflorescence biomass, fruit-set of C. physodes were measured and dispersal of perigynia and achenes in the natural habitat and indoor condition were studied. The underground biomass of C. physodes was approximately 10 times more than the aboveground biomass. The most parts of aboveground biomass is allocated to the inflorescence, which suggests that C. physodes allocates most biomass to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carex physodes; Reproduction; Dispersal pattern; Perigynium. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100213 |
| |
|
|
| Acciares,H.A.; Zuluaga,M.S.. |
| The use of narrow plant spacing in corn (Zea mays) has been suggested as a technological alternative to obtain grain yield increases, due to a better use of resources. The regular pattern could diminish intraspecific competition while favoring interspecific competition with weeds. The objective of this study was to analyze the effect of corn row spacing on weed aboveground biomass and corn grain yield. Field experiments were conducted during 2002/2003 and 2003/2004 growing seasons. Three corn hybrids with two-row width (0.70 and 0.35 m) were tested. A greater photosynthetic photon flux density (PPFD) interception with a lower weed aboveground dry matter in narrow row arrangement was obtained. Corn grain yield was greater in the narrow row arrangement than... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed cultural control; Row arrangement; Natural weed populations. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582006000200011 |
| |
|
| |
|
|
| Adati,C.; Oliveira,V.A.; Karam,D.. |
| As plantas daninhas acarretam reduções no rendimento das culturas agrícolas. Os modelos matemáticos de estimativa de perda de rendimento na cultura devido à interferência dessas plantas podem ser instrumentos úteis à tomada de decisão de manejo. Se for possível prever as perdas de rendimento, será possível decidir se é viável ou não a aplicação de uma medida de controle. Há na literatura vários modelos matemáticos empíricos de regressão lineares, não-lineares e polinomiais usados para estimar as perdas de rendimento devido às plantas daninhas. O presente trabalho teve como objetivo apresentar uma análise dos modelos matemáticos presentes na literatura utilizados para estimar as perdas de rendimento que as plantas daninhas acarretam à cultura, considerando... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modelos matemáticos; Perdas de rendimento; Plantas daninhas. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582006000100001 |
| |
|
|
| Adegas,F.S; Oliveira,M.F; Vieira,O.V; Prete,C.E.C; Gazziero,D.L.P; Voll,E. |
| O levantamento fitossociológico da comunidade de plantas daninhas na cultura do girassol foi realizado em duas épocas distintas: no desenvolvimento inicial da cultura (entre 20 e 40 dias após a semeadura) e na pré-colheita do girassol. As espécies de plantas daninhas foram identificadas e quantificadas pelo método do quadrado inventário (1,0 x 1,0 m), com amostragem de 12 m² por área. Os levantamentos foram realizados em 54 propriedades de seis municípios da região do cerrado e em 38 propriedades de oito municípios da região dos pampas, que são as duas principais regiões produtoras brasileiras. Foram registrados a frequência, a frequência relativa, a densidade, a densidade relativa, a abundância, a abundância relativa, o índice de importância relativa e o... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Competição; Fitossociologia; Helianthus annuus; Infestação. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582010000400002 |
| |
|
|
| Adegas,F.S.; Voll,E.. |
| Um experimento foi conduzido no laboratório da Embrapa Soja, Londrina-PR, com o objetivo de avaliar as correlações entre períodos de embebição, níveis de absorção de água e germinação das sementes da planta daninha Bidens pilosa (picão-preto). As sementes de picão-preto, colhidas em março de 1997, foram colocadas para embeber em água por períodos de 6, 12, 18, 24 e 48 horas. Em seguida, foi determinado o teor de água nas sementes e a condutividade elétrica dos seus exsudatos. A germinação foi avaliada em germinador com ciclo de 14/10 horas de luz fluorescente difusa e escura, respectivamente, com temperaturas respectivas de 30º/20 ºC e umidade relativa constante de 90±5%. Foi usado o delineamento inteiramente casualizado, com quatro repetições, de 100... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Condutividade elétrica; Absorção de água; Planta daninha. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582003000100003 |
| |
| Registros recuperados: 2.357 | |
|
|
|
