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| Registros recuperados: 141 | |
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| SUDA,CECILIA N.K.; GIORGINI,JARBAS F.. |
| Seed composition and reserve mobilization were investigated in wild poinsettia (Euphorbia heterophylla L.). Lipids, around 60% of seed dry mass, are the major reserve. Proteins, including albumins (49%), salt insoluble globulins (30%), salt-soluble globulins (21%) and prolamins (0.3%), comprise about a quarter of seed dry mass. Soluble sugars comprise about 3.6% of seed dry mass, sucrose being the predominant sugar. Starch was not detected in the endosperm of E. heterophylla. Lipid depletion starts after initial imbibition, and is completed between 72 and 96 hours. Protein fractions exhibit different degradation patterns, salt-soluble globulins being continuously degraded after the start of imbibition whereas salt insoluble fractions are degraded between... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed; Wild poinsettia; Euphorbiaceae; Proteins; Lipids; Carbohydrates. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-31312000000300006 |
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| Santos,Márcia Vitória; Ferreira,Francisco Affonso; Freitas,Francisco Cláudio Lopes de; Fonseca,Dilermando Miranda da; Carvalho,Abner José de; Braz,Thiago Gomes dos Santos. |
| This study was carried out with the aim of assessing the efficacy of the fluazifop-p-butyl herbicide to control Brachiaria brizantha, cultivar Marandu, in the formation of Tifton 85 grazing. Treatments consisted of five doses of fluazifop-p-butyl herbicide (0.0, 62.5, 125.0, 187.5 and 250.0 g ha-1) plus controls with no herbicide, in a completely randomized layout, with four replications. Each plot consisted of a 10-L capacity pot, with two B. brizantha plants and two Tifton 85 plants. The herbicide application was conducted before the tillage of B. brizantha, when they were about 15 cm high. Visual assessments of control of B. brizantha and intoxication of Tifton 85 plants, at 07, 21 and 45 days after application were carried out. Sixty days after... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chemical control; Tolerance; Weed. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200007 |
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| Velásquez Ballesteros,Oscar Julián; Murillo Perea,Elizabeth; Jairo Méndez,John; Murillo Arango,Walter; Noreña,Diana Alexandra. |
| Introduction: Sida cordifolia L. (Malvaceae) is a weed about which not much is known in Colombia. This plant is used in folk medicine to treat oral mucosa, blennorrhea, asthma and bronchitis.In Brazil it finds application as an anti-inflammatory,while in Colombia its "baba" is used for treating hair loss, constipation and internal fever, among other ailments. Objectives: to quantify the saponoside content and evaluate its antioxidant and antifungal functionality. Methods: we prepared organic, aqueous and hydroalcoholic extracts from the aerial section of the plant. The saponoside material was quantified by the DNS and p-anisaldehyde methods. The most concentrated extracts were selected for antioxidant and antifungal assays. Results: it was found that Sida... |
| Tipo: Journal article |
Palavras-chave: Sida cordifolia; Saponins; Weed; Antioxidant; P-anisaldhyde. |
| Ano: 2013 |
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1028-47962013000200013 |
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| Christoffoleti,P.J.; Caetano,R.S.X.. |
| The goal of this literature review is to discuss some of the major aspects of the soil seed bank, from its characteristics down to methodological aspects of its determination. Soil seed bank is the reservoir of viable seeds or of vegetative propagules that are present in the soil and that are able to recompose a natural vegetation. In the agroecossystems the soil seed bank is related to weeds, and the knowledge of its size and composition in terms of species can be used in the prediction of future infestations, to built simulation models of population establishment through time and also the definition of soil and cultural management programs, in order to have a rational use of herbicides. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed; Soil seed bank; Population dynamics. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500013 |
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| Dias,Guilherme Faus da Silva; Alves,Pedro Luís da Costa Aguiar; Dias,Tomás Carneiro de Souza. |
| Brachiaria decumbens is becoming one the most common weeds growing in young coffee orchards because, besides its fast growth and difficulty of control, new coffee orchards are usually established in pasture areas. In order to verify the effect of B. decumbens plant density on the early growth of coffee (Coffea arabica L. cv. Catuaí Amarelo), a competition experiment was conducted under semi-controlled humidity conditions. Soil collected in a Typic Haplustox was placed in 70 L asbestos cement boxes and one coffee seedling was planted in each box. The B. decumbens seedlings were transplanted to the boxes at the 2-4 leaf stage. Treatments consisted of 0, 4, 8, 12, 16, 20, 24, 36, 48, and 60 weeds m-2. The experimental period started 120 days after... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed; Coffee; Competition; Growth suppression. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600003 |
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| Ronnachai Changsri; Namuco, Ofelia; Migo, Teodoro; Johnson, David. |
| The efficacy of bispyribac sodium, fenoxaprop-p-ethyl + ethoxysulfuron, and propanil+butachlor were evaluated in greenhouse and field experiments, Weed Science, Crop and Environmental Sciences Division, IRRI in February - April 2013. The field plots had high weed density that had 4-6 leaves when the herbicides were applied at 15 days after land preparation. In the greenhouse experiment we grew Echinocloa crus-galli, Ludwigia octovalvis, Cyperus iria, weedy rice (Oryza sativa f. spontanea Acc. 105798 (THA)), and rice cultivars KDML105 and IR64 in pots. At 7 days after rice and weed germination, we sprayed herbicides to the above-mentioned species using a research track sprayer. The results showed that bispyribac sodium and fenoxaprop-p-ethyl+ethoxysulfuron... |
| Tipo: PhysicalObject |
Palavras-chave: Rice; Weed; Herbicides; Greenhouse; Trails; Bispyribac sodium; Fenoxaprop-p-ethyl; Ethoxysulfuron; Propanil; Butachlor; Philippines; ข้าว; วัชพืช; สารป้องกันกำจัดวัชพืช; ความเป็นพิษ; การควบคุมวัชพืช; เรือนทดลอง. |
| Ano: 2014 |
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5626 |
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| Marinho Lisboa,Fabrício. |
| Abstract The aim of this study was to evaluate the effects of burning and manual control of invasive species on a Latossolo Vermelho-Amarelo soil covered with Urochloa brizantha. Five soil samples were collected for pasture and forest, at 0-5 cm depth, to determine the accumulated respiration, microbial biomass carbon (MBC), mild organic matter, total organic carbon (TOC), water soluble carbon and MBC:TOC ratio. Three groups according soil grass coverage were selected: (1) group I with 33.5% of bare soil, (2) group 2 with 90% coverage and (3) group 3 with 53.4% coverage of invasive species. The highest value of TOC was found in forest (36.52 g/kg). The highest accumulative value of respiration in the soil was observed in group 3 (2.6 mg/kg) and the highest... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bare soil; Organic carbon; Urochloa brizantha; Weed. |
| Ano: 2018 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000300389 |
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| Bianco, Silvano; UNESP; Bianco, Matheus Saraiva; UNESP; Carvalho, Leonardo Bianco de; UNESP. |
| Com o objetivo de obter uma equação matemática que, por meio de parâmetros lineares dimensionais das folhas, permita a estimativa da área foliar de Ageratum conyzoides, estudaram-se relações entre a área foliar real (Sf) e parâmetros dimensionais do limbo foliar, como o comprimento ao longo da nervura principal (C) e a largura máxima (L) perpendicular à nervura principal, em 200 limbos foliares. Foram utilizados os modelos estatísticos: linear Y = a + bx; linear simples Y = bx, geométrico Y = axb e exponencial Y = abx. Os modelos estatísticos lineares, exponenciais e geométricos obtidos podem ser usados para estimação da área foliar do mentrasto. Do ponto de vista prático, sugere-se optar pelo modelo linear simples, envolvendo o produto C*L, com... |
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Palavras-chave: 5.01.00.00-9 Agronomia planta daninha; Análise de crescimento; Mentrasto. growth analysis; Weed; Billygoat weed. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5311 |
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| Lima, Juliana Domingues; UNESP; Moraes, Wilson da Silva; APTA. |
| O objetivo do presente trabalho foi determinar o potencial alelopático de Ipomoea fistulosa na germinação e crescimento de plântulas. Em laboratório, sementes de alface e de tomate foram colocadas para germinar na presença de água ou extratos de folhas de Ipomoea fistulosa, nas concentrações de 5, 10 e 15% (p/v). Em casa-de-vegetação, as sementes foram colocadas para germinar em bandejas, contendo o substrato Plantmax® e o substrato Plantmax® + resíduo de folhas secas de Ipomoea fistulosa, na proporção 3% (p/p). O extrato aquoso inibiu a germinação e elevou o tempo médio de germinação das sementes, além de reduzir o crescimento da radícula e hipocótilo em todas as concentrações utilizadas. Em casa-de-vegetação, a altura da planta, o número de folhas, o... |
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Palavras-chave: 5.01.00.00-9 Agronomia Ipomoae fistulosa; Planta daninha; Alelopatia 5.01.03.00-8 Fitotecnia Ipomoea fistulosa; Weed; Alellopathy. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3553 |
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| Carvalho, Leonardo Bianco; FCAV-UNESP; Bianco, Silvano; FCAV-UNESP; Galati, Valéria Cury; UNESP; Panosso, Alan Rodrigo; FCAV-UNESP. |
| Knowledge of the weed leaf area may give support to study the interference relationships between weeds and crops. The objective of this research was to determine a mathematical equation for M. cissoides leaf area estimation based on the relationship between the leaf blade linear measures. Leaves of the species were collected from a variety of agroecosystems at São Paulo State University, Jaboticabal, São Paulo State, Brazil, measuring the length (L), maximum width (W) and real leaf blade area of the three kinds of leaflets. Linear equations Y = a x (X) were estimated for each kind of leaflet. The confidence intervals of the primary leaflet equation overlapped those ones from the secondary leaflet equation, and then only one equation was considered for... |
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Palavras-chave: Weed; Growth; Roadside woodrose; Linear fit Weed; Growth; Roadside woodrose; Linear fit. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6379 |
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| Vieira, Viviane Cristina; Faculdade de Ciências Agrárias e Veterinárias/Universidade Estadual Paulista; Alves, Pedro Luís da Costa Aguiar; Faculdade de Ciências Agrárias e Veterinárias/Universidade Estadual Paulista; Picchi, Simone Cristina; Faculdade de Ciências Agrárias e Veterinárias/Universidade Estadual Paulista; Lemos, Manoel Victor Franco; Faculdade de Ciências Agrárias e Veterinárias/Universidade Estadual Paulista; Sena, Janete Apparecida Desidério; Faculdade de Ciências Agrárias e Veterinárias/Universidade Estadual Paulista. |
| Digitaria species are sugar cane crop weeds in Brazil and are being controlled with herbicides, although there are some reports of control failure, notably to the triazine group. Molecular techniques are recommended to analyze the genetic variability in weeds. RAPD (Random Amplified Polymorphic DNA), PCR-RFLP (Polymerase Chain Reaction – Restriction Fragment Length Polymorphism) and, in combination with sequencing, allow the localization of resistance genes, as well as possible mutations related to the onset of resistant individuals in some species. Thus, the objective of this work was to characterize ten accessions of Digitaria spp. by RAPD and PCR-RFLP markers, to sequence a conserved region of the psb A gene and evaluate the accessions response to... |
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Palavras-chave: Digitaria; PsbA gene; RAPD; Sequencing; Triazine; Weed Digitaria; PsbA gene; RAPD; Sequencing; Triazine; Weed. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3841 |
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| Royo-Esnal,Aritz; López,María Luisa. |
| Oxalis latifolia is a widely distributed weed that mainly affects corn fields, orchards, plant nurseries and gardens. Two forms of the weed have been identified: the common form, with fish-tailed leaflets, bulbils growing on stolons and dark pink flowers, and the Cornwall form, with rounder leaflets, sessile bulbils and whitish-pale pink flowers. In this study, the fresh matter production, expressed as the increase of the bulbs' fresh weight, of both forms was compared during two growing seasons in two locations. The bulbs were grown in pots from spring to autumn, and different aspects of growth were measured at the end of each season. The total fresh matter production, weight of the apical bulb, total weight of the lateral bulbs and number of lateral... |
| Tipo: Journal article |
Palavras-chave: Bulb; Climate; Oxalis; Soil conditions; Weed. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200007 |
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| Rocha-Pereira,Maria R; Klar,Antônio E; Martins,Dagoberto; Ferreira de Souza,Guilherme S; Villalba,Juana. |
| This project aimed to measure the control efficiency of Acetil Coenzime A Carboxilase (ACCase)-inhibiting herbicides post-emergence applied to Urochloa decumbens (Stapf) R.D. Webster under different soil water contents. The experiment was conducted in a greenhouse at the Department of Plant Production, Faculty of Agronomic Sciences, UNESP, Botucatu, São Paulo. The experimental design was a completely randomized design with four replications, consisting of a 9 x 4 factorial, combined with three water management systems (-0.03, -0.07 and -1.5 MPa) and three herbicides (fluazifop-p-butyl, haloxyfop-methyl and sethoxydim + oil using four doses (100, 50, 25 and 0% of the recommended dose). Herbicide applications were conducted at two vegetative stages for all... |
| Tipo: Journal article |
Palavras-chave: Chemical control; Graminicide; Water restriction; Weed. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100018 |
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| Registros recuperados: 141 | |
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