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| Registros recuperados: 2.357 | |
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| ALMEIDA,J.F.; GARCÍA,G.P.; PÉREZ,R.A.; BRITO,J.D.. |
| ABSTRACT: This work was conducted in the Centro de Pesquisa, Pós-graduação e Preservação Amazônica (CIPCA), located in the Ecuadorian Amazon Region, with the goal to analyze the presence of weeds in promising clones of cocoa. The EET-95, EET-96 and EET-103 promising clones were evaluated, and the control sample was CCN-51. To do so, the relative frequency and distribution of the existing weeds were determined, as well as their biomass, which was statistically analyzed by the ANOVA of a factor and the HSD Tukey’s test. The presence of weeds was influenced by the studied genotypes, due to the fact that promising clones were associated to high frequency and distribution, such as Cyperus odoratus, Megathyrsus maximus, Sauvagesia erecta ssp. erecta. Other... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomass; Clones; Distribution; Frequency; Theobroma cacao. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100243 |
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| QUINTERO-PERTÚZ,I.; CARBONÓ-DELAHOZ,E.; JARMA-OROZCO,A.. |
| ABSTRACT: This study was conducted to determine the richness and composition of weed communities associated with banana plantations in Magdalena department, Colombia. Between September 2016 and May 2017, a total of 164 hectares were assessed over four agroecological zones (Alta, Media, Baja and Norte); in each zone, three representative farms were selected where, through zigzag paths, botanical collections were made in cultivated lots. Information on life cycle, growth habit and origin of each species was included. The floristic composition was represented by 204 species distributed among 143 genera and 54 families. Poaceae, with 31 species, was the family with the highest species richness, followed by Fabaceae (12) and Asteraceae (11). From the total... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Banana plantations; Floristic composition; Species richness; Weed community. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100215 |
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| 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 |
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| GIRALDELI,A.L.; SAN GREGORIO,J.P.R.; MONQUERO,P.A.; AGUILLERA,M.M.; RIBEIRO,N.M.. |
| ABSTRACT The presence of weeds and nematodes can affect of sugarcane yield. This research evaluated whether weeds that are very frequent in mechanized harvested sugarcane can be hosts for root-knot nematodes: Meloidogyne incognita or Meloidogyne javanica. Regarding nematode hospitability, ten weed species as well as a control sample (tomato) were evaluated; they were inoculated with M. incognita and M. javanica. The plants were inoculated with 2,000 eggs and second-stage juveniles (J2), and there were three plants per experimental unit (6,000 eggs and J2 per pot - repeatition); 60 days after inoculation (DAI), the plants were removed and evaluated according to reproduction factor (RF), nematode final population (FP) and reproducibility index (RI).... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Meloidogyne incognita; Meloidogyne javanica; Fitoparasites; Control; Saccharum officinarum. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100221 |
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| OBRADOR-OLÁN,J.J.; GARCÍA-LÓPEZ,E.; ALMEYDA-SANTOS,L.E.; CASTELÁN-ESTRADA,M.; CARRILLO-ÁVILA,E.. |
| ABSTRACT: Cover crops play an important role in sustainable agriculture, as they decrease soil erosion, promote the incorporation of nitrogen into the soil and reduce or modify weed communities. Aiming at evaluating the changes related to the cultivation and incorporation of sunn crotalaria (Crotalaria juncea L.1753) in a weed community of a soil cultivated with sugarcane, an agro-industrial crop of vital importance to La Chontalpa region, Tabasco, Mexico, an experiment encompassing the cultivation cycle and the incorporation of the dry phytomass of this cover crop was carried out. The treatments included three levels of fertilization and two controls, the plots of the first control were interspersed with those of the treatments, while the second control... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sunn crotalaria; Saccharum; Weed control; Cover crop. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100202 |
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| 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 |
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| Concenço,G.; Ceccon,G.; Fonseca,I.C.; Leite,L.F.; Schwerz,F.; Correia,I.V.T.. |
| Corn is planted in the Center West region of Brazil as a second crop, following soybeans or beans. Intercropping of Brachiaria species with corn as a second crop increases the mulching in the cropping system. This study aimed to evaluate the weeds infestation in soybeans following corn/forages intercrop, as a function of corn plant structure, forage species and density. Experiments were conducted in a completely randomized blocks design with four replications, in Ponta Porã and Dourados municipalities, Mato Grosso do Sul state, Brazil, in 2010/2011. Treatments consisted of three corn hybrids with distinct plant architectures intercropped with three forage species: Brachiaria ruziziensis, B. brizantha and B.decumbens, at five densities, and the resulting... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachiaria; Weed proportion index; Winter crop; Mulching. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000400005 |
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| MARTINS,D.A.; JAKELAITIS,A.; COSTA,A.C.; ALMEIDA,G.M.A.; SILVA FILHO,R.O.. |
| ABSTRACT: Pequi plants are native fruit species of the Cerrado and is at risk of extinction due to the destruction of native vegetation and the extraction of their fruits. Because this species has a long juvenile period, it becomes susceptible to the interference of weeds, mainly forage grass. This research aimed to evaluate the effects of forage grass species coexisting with small seedlings. The treatments, arranged in a factorial scheme, consisted of three weed species(Melinis minutiflora, Paspalum notatumandUrochloa decumbens)coexisting in four densities (1, 2, 3, and 4 plants per pot) with pequi plants. As an additional treatment a pequi plant was cultivated free of coexistence. The physiological variables photosynthetic rate (A), stomatal conductance... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caryocar brasiliense; Urochloa decumbens; Melinis minutiflora; Paspalum notatum. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100208 |
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| Concenço,G; Ceccon,G; Schwerz,F; Fonseca,I.C; Leite,L.F. |
| Intercropping systems involving corn are often subjected to stress caused by weeds, which usually result in 30-70 per cent yield loss when no control practice is applied. This study aimed to assess the composition of weed communities due to soil coverage, at neighboring areas submitted to distinct soil managements. The soil was collected at field and the study was conducted under a greenhouse in three steps: (1) weeds composition and importance within each treatment; (2) comparison between treatments (distinct crop and intercropping managements); (3) infestation in the area as a whole. The weed composition in the short term is influenced by the management of the area, but this shift requires some more years to be reflected at the soil seed bank. Some weed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil coverage; Soil management; Phytosociology. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000400011 |
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| Concenço,G.; Silva,C.J.; Staut,L.A.; Pontes,C.S.; Laurindo,L.C.A.S.; Souza,N.C.D.S.. |
| In the Western Region of Brazil, it is usual to have two agricultural harvests in the same cropping season. Usually the first crop is soybean, followed by corn. In areas where corn is not planted due to a delayed harvest of soybean, farmers generally do not use winter crops. For these areas, the planting of winter oilseed crops aiming at the production of bio-fuels is one of the best alternatives; in addition, this would help in reducing the occurrence of weed species at the following summer crop. This study aimed to assessing the weed community in distinct winter crops post soybean crop, in terms of species composition, level of infestation and severity of occurrence. The following treatments were evaluated: agriculture under a no-till system with winter... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytosociology; Oilseed crops; Infestation; Crambe abyssinica; Brassica napus; Raphanus sativus. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000400008 |
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| Souza,A.D; Silva,P.S.L; Oliveira,O.F; Dantas,I.M; Morais,P.L.D. |
| Assessing the growth and floristic composition of species that grow under the canopy of trees is important for weed control (WC). The objective of this study was to assess two experiments (E1 and E2), when the trees were two years and one year of age, respectively. In E1, sabiá (S) and gliricidia (G) were submitted to planting densities from 400 to 1.200 plants ha-1. In E2, growing systems consisting of S, G, and neem (N) combinations were compared: SSS, GGG, NNN, GSG, NSN, SGS, NGN, SNS, and GNG (each letter represents a row of plants). A random block design was adopted, with three (E1) and four (E2) replicates. In E1, treatments were arranged as split-plots (species in plots). In E2, the degrees of freedom for treatments (8) were partitioned into growing... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mimosa caesalpiinifolia; Gliricidia sepium; Azadirachta indica; Growth; Floristic composition; Understory. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000100004 |
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| JAVAID,M.M.; TANVEER,A.; ALI,H.H.; SHAHID,M.A.; BALAL,R.M.; AQEEL,M.A.. |
| Emex australis and E. spinosa are significant weed species in wheat and other crops. Information on the extent of competition of the Emex species will be helpful to access yield losses in wheat. Field experiments were conducted to quantify the interference of tested weed densities each as single or mixture of both at 1:1 on their growth and yield, wheat yield components and wheat grain yield losses in two consecutive years. Dry weight of both weed species increased from 3-6 g m-2 with every additional plant of weed, whereas seed number and weight per plant decreased with increasing density of either weed. Both weed species caused considerable decrease in yield components like spike bearing tillers, number of grains per spike, 1000-grain weight of wheat... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triticum aestivum; Yield loss; Weed competition; Emex australis; Emex spinosa. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000100035 |
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| SIBTAIN,M.; TANVEER,A.; JAVAID,M.M.; ALI,H.H.. |
| Chickpea yield potential is limited by weed competition in typical chickpea growing areas of Pakistan where zero tillage crop grown on moisture conserved from rains received during the months of September and August. The objective of this work was to evaluate the growth and yield characteristics of chickpea grown in coexistence with increasing densities of wild onion (Asphodelus tenuifolius). The experiment was comprised of six density levels viz. zero, 20, 40, 80, 160 and 320 plants m-2 of A. tenuifolius. A decrease in chickpea primary and secondary branches per plant, pods per plant, seeds per pod, 100-seed weight and seed yield was observed due to more accumulation of dry matter per increasing densities of A. tenuifolius. The increase in A. tenuifolius... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cicer arietinum; Weed density; Yield components; Grain yield. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000100067 |
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| ALVES,C.; GALON,L.; WINTER,F.L.; BASSO,F.J.M.; HOLZ,C.M.; KAIZER,R.R.; PERIN,G.F.. |
| ABSTRACT: Phytoremediation comprises one of the main forms of decontamination of organic and inorganic substances in the soil, being economically viable and with a low environmental impact. The aim of this study was to verify the efficiency of winter plant species in the phytoremediation of soil contaminated with fomesafen and sulfentrazone using cucumber as an indicator species to the presence of residue. The experimental design was a completely randomized design arranged in a 6 x 4 factorial scheme with four replications for each herbicide. Factor A consisted of the phytoremediator species black oats, garden vetch, radish, bird’s-foot trefoil, white lupine, and a treatment without prior cultivation. Factor B, on the other hand, consisted of the doses of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cucumis sativus; Carryover; Soil remediation. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100220 |
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| PIASECKI,C.; RIZZARDI,M.A.. |
| ABSTRACT: Volunteer corn has high competitive capacity with bean, and the degree of interference varies as a function of corn density and origin (individual plant or clump). This study aimed to quantify bean yield losses under interference with densities of individual plants and clumps (seven plants at the same point) of GR® F2 volunteer corn and calculate the economic threshold (ET). Two experiments were carried out in a randomized blocks design with three replicates in Passo Fundo, RS, Brazil. The studied volunteer corn densities were 0, 0.5, 1, 2, 4, 8, and 12 individual plants and clumps m-2. The bean yield was assessed and calculated the yield losses (%) in response to volunteer corn interference. The yield loss data were fitted to the rectangular... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris; Zea mays; Individual plant; Costs; Clumps; Harvest losses. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100295 |
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| Registros recuperados: 2.357 | |
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